D.C.
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Washington Dulles International is the costliest U.S. airport to fly out of domestically on average, per the latest Transportation Department data.
Why it matters: Add on a rideshare from D.C. and travel costs are about double what they are from Ft. Lauderdale (pro tip: take the Silver line).
By the numbers: Average domestic airfare out of Dulles ran $473 in the third quarter of 2024.
Meanwhile, domestic airfare out of Reagan National Airport flies just below the national average at $359.