WAS · Washington
City code WAS covers every airport in Washington: IAD, DCA, BWI. Handy to search flights to any airport of the city.
IADWashington Dulles International AirportKIAD · 05:05
DCARonald Reagan Washington National AirportKDCA · 05:05
BWIBaltimore/Washington International Thurgood Marshall AirportKBWI · 05:05
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On a booking site, searching “WAS” shows flights to all these airports at once.