Booking the cheapest flight is largely influenced by date and destination.
But deciding where to fly in and out of can be just as important.
To determine where travelers are finding the best deals (and where they’re overpaying for their trips), FinanceBuzz analyzed domestic airfares from the 45 busiest airports in the U.S.
Take a look at the comprehensive study: 2025 U.S. Airport Cost Rankings
We found the average round-trip should cost around $384. For the fourth year in a row, Dulles International Airport (IAD) and San Francisco International Airport (SFO) have the two highest averages in the country. Something your readers should keep in mind when booking.
