By the numbers: Domestic airfare from DIA cost $337, about $29 less than the average among the 50 busiest airports nationwide, per the latest Transportation Department data from the third quarter of 2024.
Zoom out: Washington Dulles International, John Wayne (Santa Ana, California) and San Francisco International are the costliest U.S. airports to fly domestically.
Average domestic airfare from Dulles sets you back $473.
Between the lines: Vacation hotspots like Las Vegas and Orlando had some of the most affordable departures.
You could leave Ft. Lauderdale for a relatively measly $252 on average.
What to watch: Whether ticket prices will be affected after construction at DIA finishes in 2027, at which point the airport in the city's far northeast corner expects 100 million annual passengers.