For the tenth year, ARC and Expedia partnered to deliver the 2025 Air Hacks Report, a data-driven look at how travelers can save money booking air travel. The report, which incorporates findings from OAG, analyzes data over the past 12 months to show which travel trends impact airfare. The report takes a deeper look at eight air travel myths and highlights tips to save on your upcoming travel.

What month is the cheapest for air travel?

While summer is the busiest time for airlines and air travelers, it isn’t always the most expensive. ARC’s global database found that flying in August could save travelers up to 13% when flying economy. ARC’s data also concluded that the month of March, which is synonymous with spring break in the U.S. and other countries around the world, is typically the most expensive month to fly.

When it comes to seating, for travelers flying premium, July is as the cheapest month on average compared to February, which is the most expensive.

When should you book travel?

Sunday, on average, remains the cheapest day to book flights, with savings of up to 8% compared to booking on a Friday. That margin shrunk from last year’s difference of 13%.

Sunday is the cheapest day to book air travel for both domestic and international bookings and across economy and premium tickets.

While Sunday remains the cheapest day to purchase air travel, there’s a sweet spot for how many days out travelers should plan to buy.

If you're traveling domestically, the best time to buy is at least 34 days from your intended departure date. This could help save up to 25% compared to last-minute bookings.

Travelers who booked international flights 18 to 29 days in advance of their travel saved up to 17% compared to those who booked more than two months out.

What days should you plan to travel?

For domestic trips, the best day to leave is on Saturday. Travelers can save up to 17% compared to traveling on Sundays, which is the priciest.

For international travel, plan to leave on a Thursday to save up to 15% compared to Sunday.

Want to avoid crowds?

Did you know there are certain days of the week where airports may be less crowded? Based on analysis of travel dates, Tuesday is typically the quietest day of the week at airports.

Want to give yourself and even better shot of avoiding crowds? January is typically the slowest month for airlines.

View the full 2025 Air Hacks Report on Expedia’s website.