The Best Time To Buy Cheap Flights Online: A Full Guide

Best Time Super Cheap Flights Online

I feel you. Finding the absolute best time to buy cheap flights online sometimes feels like playing in the stock market. This is why you can rely on this guide. All you need to know to start saving some money!

As an addict on travel technology and the digital world in general, I’ve read loads of articles, infographics and posts about when to buy the cheapest flights possible to anywhere – and not surprisingly there’s a lot of misinformation out there.

I’ve written about some useful mobile apps to find a cheap flight before and a complete guide to find cheap flights with many travel hacks you can start applying today.

But I’ve always wanted to have a more complete guide to share with you in a straightforward way the best time to buy a flight.

Well, hopefully this is it and we can all improve our flight tracking skills!

best time to buy cheap flights online timing ideal
If you are on a budget, a lot of headache can happen before you hop on a flight like this.

Why is finding a cheap flight such a big mystery?

Not many years ago, you’d just go to your local travel agency and say you wanted to book a flight. Apart from occasional offers, prices were basically fixed-rate. And you walk out the door ecstatic with the ticket in your hand. Done.

A lot has changed.

There are now awesome flight websites and apps to make your life easier. And tons of flight hacks to take into account.

Buying a flight online today has never been easier, but that doesn’t necessarily mean it got simpler. 

If you think about it with a mathematics hat, finding a cheap flight a minimization problem. We want to find the lowest price of a flight. But there are many factors to weigh in, such as:

  • Itinerary
  • Dates and times of the flight
  • Price of oil
  • Offers and special discounts of the airlines
  • Major events happening in your end destination
  • Plane crashes (yes, they also affect prices)
  • Timing of purchase

All of these have an impact on the price of the flight you are looking. That’s why there are tons of researchers and travel experts out there trying to find the best answer to when should we buy our airline tickets and no one seems to find it.

However in this post I will address only this last bullet.

We’ve heard Tuesdays afternoon are the best time possible to book a flight. Sorry, I meant Sundays. Forget it, just use this mathematical formula.

OK, breathe in.

How early should I buy my airline tickets?

Common sense tells you simply to buy any flight as early as possible. *Insert wrong buzzer sound*.

Turns out that unless you are flying in holiday seasons (e.g. Christmas), that’s one of the biggest travel mistakes you can make. Airlines rarely roll out offers nor drop their prices with more than 6 months, so by booking extremely early you will likely pay a mid-range price which won’t be the best deal.

There’s only one thing worse than buying your flight too soon: buying it too late.

Also, remember the only thing we can be sure of in this world: last-minute deals are soooo 2001. Fights bought within 14 days of date of the departure are always the most expensive, so waiting for the eleventh hour is not a very wise idea! Always try booking your airline tickets sooner rather than later.

How much time in advance should you buy flights?

The range of possible answers to this question is huge – I’ve seen anywhere from 21 to 171 days as the ideal time in advance to buy international flights!

The way we can digest all these studies and insights is by compromizing. If no one’s 100% right, then the closest we’d have to a right answer is somewhere in the middle.

the best time to buy cheap flights online timing ideal
A buying window of 10-14 weeks before flying seems optimal to lower the prices of airline tickets. 12 weeks if you’re not into ranges.

Averaging all these results I came up with a airline fare buying window of 10-14 weeks before as the ideal timing to buy a flight online. 12 weeks to be more exact.


  • This isn’t rocket science or a major mathematical formula worthy of a Nobel prize behind it. I just did a weighted average of these results, giving more weight to the more recent studies.
  • These 10-14 weeks are just an indicator. I can’t reinforce this enough. Your ideal time can and will depend heavily from the time of the year you’re flying, your end destination, offers available in the airlines, amongst many other factors.
  • I’d probably add some days/weeks to the buying window in case if I’m buying a long-haul flight. Just using my intuition here.

How much can I save by traveling off-peak?

The short answer is: a lot.

Of course, there’s a reason the off-season is less popular and that often comes down to weather. It’s not pleasant to visit a place with freezing cold and pouring rain, like my visit to the city of Ghent, Belgium.

However the peak season can be as discouraging. Every year the majority of people travel to Europe in the months of July and August. Actually here in Spain I’ve been asked a lot of times: Where are you going in August? Well, absolutely nowhere!

My annoying experience in Rome last July was eye-opening: everything was crowded, overpriced or BOTH. The suffocating heat didn’t help to get a good mood. My advice would be to think twice before heading to a major european city in the peak summer months.

best time to buy cheap flights travel to europe
The yearly travel seasons in Europe. Choose wisely.

With a few exceptions – big cities like Paris are empty in August for instance – it’s a good idea to dash off in the european shoulder season – May to June and September to October. Crowds and prices are dramatically lower. I’ve had a great experience along the Dalmatian Coast in September. The weather is still good and there are a lot more deals and special offers available.

But how much can you really save? The same hotel can have price differences of about 30% comparing to peak season. Menorca and Maiorca in the Balearic Islands are a great example.

Flight prices follow the same trend: in shoulder season they can be cut by half.

Which day of the week is the cheapest to fly?

The cheapest days to fly are the ones people fly the least. *Captain Obvious flies away*. 

Seriously. It’s no surprise flights are cheaper if you travel on a Tuesday, Wednesday or a Saturday whereas the most expensive days of the week to fly are Fridays and Sundays. The latter are beloved by travelers who want to make the most of a week or a getaway weekend.

Crunching the numbers from CheapAir the difference between a Tuesday flight and a Sunday flight on average is 29EUR each way. I’ve seen prices drop to half just by traveling on a Thursday instead of a Friday (a one-day difference!).

Having flexibility to shift your travel dates to these days seems to be key to save a ton of money.

Which day of the week is the cheapest to buy?

Here comes the tricky question… Let’s start with facts. Or “semi-facts”. Airlines usually drop their prices in the beginning of the week – Mondays-Wednesdays – and raise prices throughout the rest of the week. From my experience with the european airlines I use the most – Easyjet, Ryanair and Vueling – new flight sales are rolled out in these days, so I’d say this is correct.

During many years, the beginning of the week had consensus as having the cheapest airline tickets available. FareCompare‘s data showed the optimal time to book a flight is at Tuesday at 3pm and economist Makono Watanabe specifically suggested Wednesdays at 1am . As a result, I used to wait religiously for Tuesday nights to book my flights. I was absolutely convinced of what I was doing the right thing.

However, recent data has sent these theories through the drain and (surprisingly) identified Saturdays and Sundays as the cheapest days of the week to buy a flight – on average 15% cheaper than Tuesdays (!).

I don’t buy it.

First, it considers only flights departing from the US. Secondly, it is based on the lowest average price of a ticket sold which does NOT mean the cheapest available tickets. For instance, business travelers, which usually buy higher-priced tickets, rarely buy flights on weekends, which could understate these results. 

Perhaps better conclusions were drawn by Hopper which used data from 3,500 international flights and elected Thursday as the cheapest day to buy a flight.

This is probably the hardest metric the hardest to give advice on. If someone pointed a gun at me and compelled me to give an answer, I would stick to the Tuesday-Thursday period, just using my personal experience as a deciding factor: I rarely see an airline rolling out special discounts on weekends.

when is best time to buy cheap flights best timing to find flights
Print this and stick it on your fridge.

Anyway, don’t make the choice of the day of the week a big deal. I would move my focus to other factors. The day of the week you fly and how far in advance you buy the flight contribute much more decisively to the final price.

Unless you know the particular day your favorite airlines have special low fares (KLM always does it on Wednesdays) or have gathered strong evidence a particular day is more advantageous for your trip.

I’m confused with all these studies. When is the best time to buy cheap flights after all? What should I take from all this?

The 10-14 weeks buying window can be used as a reference. However, don’t take it as granted. The most important lesson to take from this post is that prices for each route behave differently over time.

But to help you a bit more, I will share with you is what EXACTLY I currently do when buying a flight online:

  • My buying window is 10-14 weeks (3-4 months) before the departure date, plus a few extra days/weeks if it is a long flight.
  • I start checking flight prices on Skyscanner as soon as I know when I want to travel, trying to know what is a good deal and setting up email alerts. The sooner I do this before my buying window, the better.
  • If a special deal or offer appears with a price considerably lower than I had been monitoring until then, who cares about buying windows, I just buy the damn flight.
  • Always try to travel in shoulder season in Europe: June and September are cheaper and less crowded than the peak months.
  • I don’t wait for particular day to buy a ticket anymore. Sometimes I aim for the period of the week between Tuesday-Thursday, just because it’s when most airlines roll out their deals.
  • Always try to fly on Tuesdays and Saturdays, avoiding flying on Sundays. Friday nights rarely seem a good option either.

What else should I start doing right now to find cheaper flights?

I’ve written a full article on how to find cheap flight tickets to anywhere. It contains the latest tips and hacks to make sure you can get the absolute cheapest flight possible to wherever you’re heading.

Here’s a small summary:

1. Start early.

If you check frequently the price of your flight and book relatively early, you’ll for sure maximize your probability of getting a cheap flight. The farthest you are going, the more extra time in advance you should consider.

2. Study your route.

This is perhaps the most important tip of them all. Regardless of which study or research insights you apply, they will be always generic and based on overall trends.

The big secret to hack flight tickets is to unlock the pricing trends and singularities of your specific itinerary. The particular flight you’re seeking will follow an unique price behavior during the course of each year, month and week. Get to know this in detail and you are really on track to save some money.

3. Set up email alerts.

Have you wondered how much time you waste searching flights? Email alerts in websites like Skyscanner can make your life so much easier, alerting you whenever the price drops… for free.

4. Be flexible with the time and date of the flight.

The more flexible you are with your dates and times of the day, the higher the probability of a good deal.Ryanair, the biggest european low-cost airline, has the majority of its ridiculously low fares in flights departing at 6 or 7 am.

5. Be flexible with your itinerary.

Consider nearby airports as prices can vary dramatically between them. And explore the possibility multi-city tickets. These can also be called open-jaw fares and it just means you fly into one city and come back home via a different one.

When I visited Central Europe I flied into Budapest and visited Slovakia, Austria and Czech Republic. I chose to fly back by Prague, which cost me an extra 30 EUR.

Open-jaw tickets can reveal themselves as great options, specially if you want to travel in a straight line instead of a loop.

6. No cookies.

Ensure you delete cookies/history of your browser before looking up flight prices on search engines. This is because the websites store your search data and when you come back they know you are more likely to buy than before. Some say this is a conspiracy theory, but it doesn’t hurt to try, right?

7. Use the right websites.

Stay away from booking flights at websites like TripAdvisor and Expedia who take a cut out of the airlines. As a result, they inflate their prices.

Instead try Skyscanner or Google Flights.

8. Book one passenger at a time.

Unless you are going in a forever alone trip, booking your flights one passenger at a time can open the door to grab the latest available discount fares. Be careful, you could be charged with credit card fees more than once which would cancel this advantage (thanks to my reader Nuno for this tip!).

If you want to know more about flight hacking check the full article on finding cheap flights.

Pin it for later!

When do you usually buy your flights?
Which other hacks do you apply to make you’re getting a good deal?

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55 comments đź’¬

  1. Hey there!

    Any advise to fly from Portugal to Iceland in April for a honeymoon?… I don’t know if you have any feedback on the matter.

    Thank you for your post!

  2. Finding a flight in budget is really getting tougher. Thanks for the wonderful post!

    1. It’s funny how more technology and more tools are giving us less and less chances.
      But travel hacking is still a thing! 🙂

  3. Thanks for sharing information. This is great. Very helpful. Your post are so useful and practical!!!!!

  4. I’ve heard some people are using vpn set to another (poorer) country to find cheaper flights. Can someone confirm if this works?

    Also – airlines know what’s up! I’ve researched my next trip a lot, perhaps too much. The minute i booked my single way ticket from my airport -boom- all prices back home within 1-2 weeks inflated by 30-100%. Even from nearby airports.

    I of course used inkognito mode and have even checked from various places – perhaps so much the airlines believe and entire class is going to book a trip.

    I have one tip for you all – don’t let them (Skyscanner, Google flights) know your exact date of travel! Only browse through the list of prices for the entire month without clicking for more information about your particular flight. When you click for more info Skyscanner says “hey someone’s interested in traveling your flight” to the airline companies, after which prices will increase.

    1. Thanks for sharing Gustav, really good tips.
      Airlines definitely make use of cookies – I often see myself searching for a flight for a specific date, searching alternative dates and when I go back, prices are inflated! However, I usually wait for 24-hours and the price is back to normal.

      VERY interesting tip your last one, I’ll try to be careful where we click when I’m not sure on my dates…

  5. Great article. Thanks for sharing.
    I really find flights more expensive during holidays and weekend. I use to check on, and

    1. Thanks for sharing your experience.
      Honestly I sometimes use Momondo too, they’re pretty good for multi-stop flights.

  6. I appreciate your article. This blog is really helpful to give you the informattion of cheapest broadway tickets. So thanks for sharing all that important information.

  7. Thank u soo much for sharing this . Can tell me exactly in which month shuld i book my international tickets from Mumbai (India) to Miami, im going for a cruise scheduled for 8th april 2018. So when shuld i book my flights.

    1. I suggest you use Hopper for this. No one can tell you the exact month to buy your flights, but I’d say end of the year.

  8. Outstanding post very deeply explained. Put the focus on all possible ways to get cheap tickets online.
    Loved while reading. Also, read this it will also give you some great information to work on.

  9. Great suggestions! But I use a new comparator that has the philosophy of trivago but dedicated to flights. A trivago for flights called that allows the comparison of airlines around the world and find the cheapest ticket, including the budget airlines which many search engines exclude. Last week I’ve booked a flight to Miami and return, saving a lot of money that I spent during my stay!

  10. Great post; people always want that Silver Bullet but it actually takes a little work to find the cheapest. If its not worth it to you to do that, then you just need to accept you’re not always going to get the cheapest fares!

    I do have to say that ITA Matrix is my favorite tool just for the sheer power of all the different features. Certainly not the easiest (SkyScanner and Google Flights and Kayak probably win here) but once you know it well, you can find some amazing options!

  11. I have always wondered at people who say they should book asap – maybe a year earlier. No, not at all. I have found the best offers somewhat in your range – around 3 months (10-14 weeks exactly) +- 1 or 2 weeks. I have read somewhere that if you book a flight on a Wednesday morning, rather than a Tuesday evening, it would be cheaper regardless of the fact that it is some hours later. Haven’t tried it yet, but you could give it a try if you are not too pressed.

    I loved the tip for the cookies – I will stick to that.

    Thanks, lovely article and great job with the graphs!

    1. Many thanks for your input!

      Indeed the middle of the week seems a good timing, but I guess it all depends on the amount of people booking at the same time.

      I just wish there was some place where we could book REALLY last-minute flights at a reduced price. It would be a win-win situation for us and airlines (business idea anyone?)!

  12. Online ticketing system is helpful for many industries including buses, ferries, airplane and more.

  13. Really appreciated, you did lot of hard work to write this blog… But I want to add a little thing whenever I travel usually book cheap flights which I found from fares or web such as Dream World Travel. 🙂

  14. Wow, you’ve done a lot of work – great post!
    I want to add couple things learned from personal experience:
    1. If you are looking for international tickets from South America to Europe or North America, ticket price stays the same no matter how many months/days in advance you are looking for. However, ticket prices for flights within South America do change.
    2. Using aggregators like Kayak or SkyScanner is very convenient and makes life much easier. However, airlines sometimes have special offers that aggregators do not pick up. Even if you found a suitable ticket, checking airline website is a good idea to make sure that you are not missing anything. Also, there is still some smaller/tiny airlines that aggregators ignore. Sometimes, they offer considerably better deals than bigger airlines, especially if you are flying without luggage. Finding them is a hassle, but if you frequent a particular region, it’s worth looking them up.

    1. Hey Elena,

      Thank you so much for sharing your insights. It’s interesting to see every region of the globe has its own trends and characteristics in terms of airfare too! I had no idea South America followed those patterns.

      You’re completely right on the second point you mentioned and I may have skipped that on the post. It’s always a good idea to double check with the airlines, aggregators DO NOT pick up prices instantly so very often I can find some mismatch.

      Thanks again for your input.

  15. There’s so many myths about the right time to buy, thanks for clearing some of those up! I’ve been religiously sticking to Tuesdays too, but it looks like that’s out the window (literally)!!

    1. The information around this theme is so disperse, hard to draw clear lines on anything! Anyway, tuesdays apparently are a good day to fly (and to buy as well).

  16. Thank you so much for this post. Great to see it all lined up for once. Seems I did a lot of this though for my flight for this summer (by happy chance). What I usually do when I fly together with someone else to avoid the whole “cookie” thing, is to let one person search and let the other (at a different computer and location) book!

    1. Glad you liked the post, hope it’s useful for you in the future, but looks like you’re already a pro!
      The cookie tip is one of the most useful. I’ve seen two different prices with the exact same search in two different computers (one had already searched the flight, the other didn’t), it’s crazy! I usually do same as you or just use the “incognito” mode in Chrome.

  17. Very in-depth post with a lot to think about! I would say I’ve had luck getting great flights around 12 weeks before departure but friends in the airline industry say flight sales are done in blocks and earlier is always better before the cheapest block is bought. Searching using different location/VPN or using a local website (like I used Spanish website to book cheaper tickets to Ibiza) can help.
    Great advice and I’ll check out flights on different days to see if I can get deals now. Thanks for sharing!

    1. Thanks Kate.
      The VPN/location change is a GREAT tip, prices can vary dramatically just by changing your location. Didn’t remember to put that tip on the article.

      Hope you can find better deals! 🙂

  18. I am very VERY thankful for this post! It’s absolutely helpful!!! I’ve been using Kayak but it’s nice to see the other options. Anyhow, I’ve already bookmarked this for future reference. Keep it up!

    1. You welcome Aileen! Hope you can actually save some money now.
      I love KAYAK, good choice 🙂

  19. Great post and very in depth. I think it’s hard to get it right and a lot of it is trial and error and also being flexible. We do tend to travel in the Spring and Autumn more and also fly toward the beginning of the week. Skyscanner is also great too. There is a fine balance too between getting the timing right, not too early but not too late! This has set it all out though!

    1. Thanks Nic!
      By flying shoulder season and on the beginning of the week, you already know the drill ;).But there is definitely no secret formula to a cheap flight. You got to dive deep into the details to find that sweet spot between not too late and not too early.

  20. What a useful post! I have actually saved the link, and will go back to it when I am thinking of buying my next flights 🙂 thanks for all your advice!