Low fares to London from Washington area airports IAD, DCA, BWI put London under $600 round trip with all three major alliance airlines AA, DL, UA. This is similar to all three alliance airlines offering low fares from New York to Paris under $600 today. If previous fares today are any example, this deal might be gone in a few hours. These fares were found at 7:30pm ET Friday June 17.
Low fare departure dates are limited to about six weeks from mid-September through October.
United has lowest fare at $544 for Air Canada IAD – Toronto YYZ-LGW transatlantic flights and about $578 for all United-operated flights.
United Airlines Washington IAD – London LGW
$543.56 Sat Sep 17 – Sat Sep 24
American Airlines is $551 Washington National DCA – London LGW
American Airlines $551.16 Sat Sep 17 – Sat Sep 24
Delta has $578 round trip for nonstop codeshare flights with Virgin Atlantic.
Delta Airlines Washington IAD – London LGW
$577.56 round trip Sat Sep 17 – Sat Sep 24