This Is The Cheapest Day To Buy Flights — & It Might Surprise You!

The report's findings have shown that Sunday is actually the cheapest day to book flights, with travelers saving an average of 6% on domestic flights and as much as 17% on international flights compared to Mondays or Fridays.

Why exactly Sunday offers the most affordable airfare options could be due to two factors. First, recreational travel is typically booked on Fridays; meanwhile, travel for work is more popular on Mondays. These two days represent the most expensive days of the week to book a flight.

Sunday tends to be viewed as a day reserved for catching up on rest and gearing up for the week ahead. Perhaps that's why fewer people decide to fly on Sunday, and the lower demand leads to cheaper ticket prices.

However, it's important to note that the day of your actual flight departure also matters. Those flying domestically could save as much as 17% if they head out on a Saturday; meanwhile, international vacationers may save up to 15% if they leave on a Thursday.

And even though booking on a Sunday may be the most budget-friendly, departing on a Sunday is actually the most expensive.

Aside from what days to book and fly, Expedia's 2025 Air Hacks Report also debunked plenty of popular travel myths to help better inform passengers.

First, it's long been thought that summer is the most expensive season to travel, given the warmer weather. Contrary to popular belief, August is the cheapest month of the year to jet set. The chillier months of February and March turn out to be the most costly, possibly because people like to escape cold weather over mid-winter and spring break.

Next, many people think that booking flights as far in advance as possible is the best way to save on airfare costs. This isn't always the case, with the "sweet spot" for ticket-buying differing depending on whether you plan to travel within the States or abroad.

For instance, domestic travelers can save 25% when they book their flights from one to three months in advance as opposed to people who wait until the last minute. International travelers, on the other hand, may save up to 17% if they wait to book until 18 to 29 days before their intended departure, compared to three months or more in advance.

Finally, if you hate encountering delays or cancellations, you may want to book a morning flight, as the report suggests these departures are much less likely to be canceled.

After 9:00 p.m., the risk of flight cancellation is 57% higher, with flights between 9:00 a.m. and 3:00 p.m. experiencing the lowest cancellation rate. Time of year may impact cancellation chances, too, as the months of August and September have just 1.2% cancellation rates.