How to Find Cheap International Flights: Book the Right Window, and Fly Midweek

The best way to find cheap international flights is to book inside the right window: 2 to 8 months ahead for off-peak trips and 4 to 10 months ahead for peak season.

After timing, flexibility does most of the work. Tuesday and Wednesday departures usually come in lower than Friday or Sunday, and a whole-month calendar view shows you the cheapest day to travel​ on your route in seconds.

Search on Google Flights, then book directly with the airline. And once the ticket is booked, there's one small step worth doing the day before you leave.

When is the best time to purchase international flights?

The best time to purchase an international flight is 2 to 8 months before departure for off-peak travel and 4 to 10 months ahead for peak season, like summer in Europe or the December holidays.

Think of it as a Goldilocks window. Not too early, not too late.

These windows give you the best odds of a low fare, not a guarantee. Still, they beat the old advice of booking six weeks out.

That rule works fine for hotels, which tend to hold steady on price, but for almost every international flight six weeks is too close.

Why do fares climb late? Airlines usually sell most of the plane at normal prices and hold back the last seats, roughly the final 20%, for people booking at the last minute.

Those travelers tend to need the flight, so the airline prices it that way.

You'll also hear that booking on a Tuesday at 2 a.m. unlocks the lowest fare. It doesn't. Prices move with demand, so when a $200 fare jumps to $320 overnight, it usually means someone bought the last seat at the lower price.

How far ahead you book matters much more than the day you click "buy."

What are the cheapest days to fly international?

Tuesday and Wednesday are usually the cheapest days to fly, with Thursday close behind.

Friday evenings and Sunday nights tend to cost the most, because that's when most people want to fly, whether they're leaving for the weekend or getting home before Monday.

Treat that as a pattern, not a law. On some routes the cheapest day to travel​ lands on a Saturday, and the only way to know is to look.

Open the flexible dates or "whole month" view on Google Flights or Skyscanner instead of comparing single dates.

Moving your departure a day or two earlier or later can swing the price more than you'd expect on the same route.

Time of day plays a part too. Red-eyes and very early departures are often the cheapest seats on the board, simply because fewer people want them.

Holidays follow their own rhythm. Christmas Eve morning and Christmas morning are usually lighter than the evenings.

And if you're flying from the US, some warm-weather favorites like Cancun and Costa Rica can get surprisingly cheap during Super Bowl week in early February, since so much of the country stays home to watch the game.

Why should you let the price pick the destination?

Letting the price pick the destination is the biggest single way to save when your dates or plans are flexible.

Most people choose a city, then choose dates, then hope the fare is reasonable. Flip that order and start with the fares.

Put your home airport into Google Flights, set the destination to "Anywhere," and see what comes up.

If you live near more than one airport, as you would in New York, Chicago, or Los Angeles, check each of them.

Travelers who search this way often end up with three or four trips for what one used to cost.

Once a cheap destination catches your eye, open the month view and find the cheapest day to travel​ before you commit.

Smaller airports deserve a second look as well. Big cities get the most deals, but smaller cities often get the best ones.

A typical roundtrip from Omaha to Europe runs $1,300 or more, while New York to Europe sits closer to $700.

So when a $483 fare from Omaha to Barcelona shows up, travelers there save $817, which is more than a New Yorker could save on almost any European fare.

It can work the other way, too. Driving two hours to a larger airport sometimes cuts the fare in half, and a short connecting flight from your local airport to a hub can beat both options.

Just count the cost of getting there. In the UK, a £24 bus to Heathrow can make a £10 train to Gatwick the smarter pick, even though Gatwick is farther away.

Is it cheaper to book two one-way tickets?

Sometimes two one-way tickets cost less than a roundtrip, and it takes about a minute to check. It pays off most often when a different airline is cheapest in each direction.

You can also fly into one city and home from another, which some booking sites now build in automatically. Not every airline allows it, but on a trip through Europe it can save you the time and money of doubling back.

If you mix airlines or book your own connection, leave room for delays. Each ticket stands on its own, so if the first flight runs late and you miss the second, the second airline has no obligation to help you.

Give yourself at least three hours between flights, and only go this route if a 24-hour delay wouldn't wreck your plans.

Should you book on Google Flights or directly with the airline?

Search on Google Flights, Skyscanner, or Kayak, then book on the airline's own website.

Comparison tools are great for spotting prices, but booking directly makes it much easier to get help if a flight is delayed or canceled.

Google Flights is usually the fastest way to find the cheapest day to travel​ across several airports at once.

The booking is where you want to be careful. Some third-party sites piece together connections from separate tickets, and when a flight goes sideways, the airline and the booking site can end up pointing at each other while you wait at the gate.

Paying $20 more to book direct is often worth it, and a price far below every other site usually comes with a catch.

Compare the final price, not the first number you see. Many economy flights​ in search results are basic economy, which on some airlines leaves out seat selection and changes.

Check what's included on the airline's site. If you'll need a checked bag, add it when you buy the ticket, because adding it later almost always costs more.

What about incognito mode or a VPN? Plenty of travelers swear by it, and plenty have never seen it move the price.

It won't hurt, but don't count on it. App and desktop prices can differ, though, and on some booking sites changing the language setting has shifted the total by around €30.

How to get discounts on flights​, even after you book

The discount most travelers miss is the post-booking price drop. Most major US airlines have done away with change fees on standard fares, so if your $200 ticket falls to $150 a week later, you can call the airline and get the $50 difference back as travel credit.

This works on most US airlines for fares above basic economy, while budget carriers generally don't allow it. Set a price alert right after you book so you know when to call.

Your credit card can pull its weight here, too. Many cards come with airline or booking-site discounts, and a strong sign-up bonus can cover a long-haul seat if you pay with points.

With points, a roundtrip is usually just two one-way prices added together, so book each direction when award seats open up.

Business class to Japan can go for 75,000 miles each way, while the same seat in cash often runs $3,000 to $5,000.

If you're traveling because of a family emergency, ask the airline about a bereavement fare. The discount is often small, but these fares can come with more room to change your dates.

What should you do the day before an international flight?

Set up your mobile data the day before you fly, so you land connected and ready to pull up maps or message home.

Travelers used to buy a physical SIM after landing. Now most people use an eSIM, a digital SIM you download through an app before your trip, with no card to pick up or swap.

Your phone just needs to be eSIM compatible and unlocked.

GigSky works this way. You install the eSIM once in the app, reuse it on every trip, and it connects on its own when you arrive, with coverage in 200+ destinations.

If you've never tried an eSIM, GigSky has a free trial in 175 destinations with an eligible Visa card.

Try GigSky Free

FAQs

What's the cheapest day to travel​ internationally?

Midweek is usually cheapest, with Tuesday and Wednesday departures often priced below Friday and Sunday. Check the whole-month view for your route, since the pattern doesn't hold everywhere.

Is it cheaper to book flights on a Tuesday?

Not reliably. The day you book matters far less than how far ahead you book, which is 2 to 8 months for off-peak international trips and 4 to 10 months for peak season.

Are last-minute economy flights​ ever cheap?

Rarely. Airlines price the last seats for travelers who need them, so fares usually rise in the final weeks. Budget airlines sometimes have cheap seats left, but they have fewer ways to rebook you if a flight is canceled.

Does searching in incognito mode lower flight prices?

Usually not. Fares change with demand, not with your browsing history. Timing and flexibility will save you far more.

Do I need an eSIM for an international trip?

You don't need one, but an eSIM is the simplest way to have data the moment you land. You download it through an app before you leave, and with GigSky it connects on its own at your destination.

Try GigSky Free

Recap: Getting Cheap International Flights

• Book 2 to 8 months ahead for off-peak international trips and 4 to 10 months ahead for peak season. Six weeks out is usually too late.
• Midweek departures are usually the cheapest days to fly international​, but the month view will confirm it for your route.
• Start with where fares are low from your home airport, and check nearby or smaller airports on both ends.
• Compare two one-way tickets against a roundtrip, and leave at least three hours for any connection you book yourself.
• Search on Google Flights or Skyscanner, then book directly with the airline.
• Call the airline if your fare drops after booking. On most standard US fares, you'll get the difference as credit.
• Set up your eSIM the day before you fly so you land connected.