When Is the Best Time to Book a Flight?

There is no universal rule, but recent data gives travelers useful ranges.

For domestic travel, Expedia's 2026 data found a particularly strong average price advantage for booking 15–30 days before departure.

Google's data, meanwhile, puts the domestic low-price point at approximately 39 days before departure.

Those figures are close enough to support a practical takeaway: for an ordinary domestic trip, start seriously watching prices about one to two months before departure rather than assuming you must buy six months in advance.

International travel is less predictable. Google recommends booking earlier based on its data, while Expedia's 2026 analysis found unusually good average prices in a shorter window.

That difference is important. International airfare can vary dramatically depending on the destination, airline competition, season and route. If you have fixed dates or you're traveling during a busy period, waiting until the last couple of weeks can be risky even if some fares happen to be cheaper.

For a typical U.S. domestic economy flight, roughly 3–7 weeks before departure is a useful range to monitor closely.

Expedia's 2026 U.S. data found its lowest average domestic economy fares in the 15–30-day booking window, with travelers paying about $130 less on average than those booking six months or more in advance.

Google Flights' data found the lowest average domestic prices around 39 days before departure.

That doesn't mean you should always wait until exactly 30 or 39 days before flying. A fare can rise before that point, particularly when demand is strong.

For example, if you're traveling on a popular route during a major event, spring break or a holiday weekend, buying a good fare earlier may be smarter than trying to predict another price drop.

International flights require a little more caution.

Google's latest published U.S. analysis found that international fares were generally lowest 49 days or more before departure.

Expedia's 2026 U.S. data found the lowest average international economy prices in an 8–15-day window, but it also found that booking 31–45 days ahead could save an average of $190 compared with booking six months or more in advance.

Because those datasets point to different sweet spots, travelers shouldn't treat the 8–15-day figure as a recommendation to wait until the last minute.

A better approach is to start tracking international fares well in advance and book when the price fits your budget.

This is particularly important when:

• Your travel dates are fixed
• You're traveling during a school holiday
• You're flying to a popular destination
• There are only a few nonstop flights
• You're traveling with several people
• You need specific seats or flight times

For a flexible traveler, waiting may sometimes work. For someone who absolutely has to travel on a particular date, a slightly higher fare purchased early can be much safer than gambling on a last-minute drop.

There can be small differences between booking days, but the day you book usually matters less than the route, travel date and fare availability.

Expedia's 2026 global analysis identified Friday as the cheapest day to book, with an average difference of about 3% compared with Sunday. However, its U.S.-domestic analysis found Saturday was the cheapest day to book domestic flights, while Monday was the most expensive.

That variation is exactly why travelers shouldn't build their entire strategy around a rule such as “always book on Tuesday.”

Airline pricing is dynamic. The fare available on a particular flight can change independently of what day of the week it is.

The day you fly can matter more than the day you purchase the ticket.

For U.S. domestic travel, Expedia's 2026 data found Tuesday was the cheapest average departure day, at about 14% less than Sunday.

Across its broader analysis, Expedia found Friday was the cheapest overall day to fly, about 8% cheaper than Sunday.

This distinction is easy to miss:

Booking day and travel day are two different things.

Changing your departure from a high-demand Sunday to a lower-demand Tuesday can potentially make a much bigger difference than waiting for a particular weekday to buy the ticket.

It depends on the trip.

If your dates are flexible and you're traveling on a competitive route, monitoring prices and waiting can sometimes pay off.

If your dates are fixed, the destination is popular, or you're traveling during a peak period, waiting can backfire.

Airlines use dynamic pricing, so there is no guarantee that a fare that costs $250 today will become $200 tomorrow. It could just as easily become $350.

A good approach is to establish a price you're comfortable paying.

If the fare is already reasonable and the flight fits your schedule, don't feel that you have to predict the absolute bottom of the market.

Saving another $20 isn't necessarily worth the risk of losing the flight or paying significantly more later.

Holiday flights deserve a different strategy.

Thanksgiving and Christmas can create sharp increases in demand. Google Flights' U.S. data found Thanksgiving fares were lowest around 35 days before departure, with a broader low-price range of 24–59 days. For Christmas, the lowest point was around 51 days before departure, with a low-price range of 32–73 days.

These are averages, not guarantees.

If you need to travel on the busiest dates around a holiday, start monitoring earlier. The most important thing is to avoid assuming that a last-minute ticket will automatically be cheaper.

Holiday flights can have limited inventory at the lowest fare levels, especially on nonstop flights at convenient times.

There isn't one cheapest month for every route.

Expedia's 2026 global analysis found July was the cheapest month to book overall, while December was the most expensive in its dataset.

But this should not be interpreted as “wait until July to buy your ticket.”

The month in which you book is different from the month in which you fly.

Expedia found August was the most affordable overall month to travel in its 2026 analysis, while January was the cheapest month for U.S. domestic travel.

Your destination and travel season can easily outweigh broad monthly averages.

Sometimes, but there's no guarantee.

Airlines may lower fares when demand is weaker or seats remain available. At other times, prices rise as departure approaches because fewer seats remain in the cheaper fare classes.

This is why “last-minute flights are always cheaper” is a dangerous assumption.

Expedia's 2026 data did find unusually low average international fares in the 8–15-day window for U.S. travelers.

But that doesn't mean every last-minute international flight will be cheap.

A last-minute deal is much easier to take advantage of when you're flexible about:

• Destination
• Departure airport
• Travel dates
• Number of stops
• Flight time
• Airline

If you need a specific flight, flexibility disappears—and so does much of the advantage of waiting.

Don't judge a fare only by the number on the screen.

Compare the price with:

• Similar flights on nearby dates
• Other airlines
• Nearby airports
• The same route over several days
• The total price after baggage and seat fees
• Previous prices tracked through a fare-monitoring tool

Google Flights also provides route-specific price insights, including its “cheapest time to book” information for supported searches. Google says travelers can use these insights alongside broader historical booking guidance.

A $220 ticket isn't necessarily cheaper than a $250 ticket if the first fare includes inconvenient connections or significant additional fees.

Look at the total cost and itinerary, not just the base fare.

There is no dependable universal rule that flights are cheapest at a particular hour.

Some travelers still believe that booking late at night or early in the morning guarantees lower fares, but airfare pricing doesn't work according to a simple daily schedule.

Instead of staying awake waiting for midnight, use price alerts and check the flight when it's convenient.

If a good fare appears, the practical question is whether you're comfortable with the price—not whether it's 11 p.m. or 7 a.m.

Basic economy can make a low advertised fare look more attractive than it actually is.

Before booking, check what the fare includes. Depending on the airline and route, restrictions can apply to things such as:

• Seat selection
• Carry-on baggage
• Checked baggage
• Ticket changes
• Refundability
• Boarding priority

Because these rules vary by airline and fare, don't assume that the cheapest fare shown in a search is the cheapest option for your trip.

If you need a checked bag or want to select your seat, compare the final price rather than the initial ticket price.

For most travelers, a simple process works better than trying to predict airfare perfectly.

If you want a simple rule to follow, use this:

For U.S. domestic flights, start watching seriously about one to two months before departure. For international flights, start tracking earlier and avoid relying on a single last-minute booking rule.

Then adjust based on your trip.

For a normal domestic trip, a fare appearing around three to six weeks before departure can be worth serious consideration. This broadly aligns with the recent Expedia and Google data.

For international travel, start monitoring months ahead. If you see a fare that fits your budget, particularly for a fixed-date or peak-season trip, there's often little reason to gamble on a future price drop.

And remember: when you fly can matter as much as when you book. For example, Expedia's 2026 data found Tuesday domestic departures were substantially cheaper on average than Sunday departures.

The best flight-booking strategy isn't about finding one secret day.

It's about finding the right combination of booking window, travel date, route, airline, flexibility and total price.