Cheapest return flights from London to Washington in September from 590€

Best time to book flights for London (LHR) to Washington (IAD) flights at AirHint

AirHint found the following cheapest return flights from London (LHR) to Washington (IAD) in September 2025 (see full year).

Return flights

10 Sep - 15 Sep British Airways
02 Sep - 09 Sep British Airways
15 Sep - 29 Sep Icelandair
09 Sep - 17 Sep Icelandair
17 Sep - 24 Sep Icelandair
06 Sep - 23 Sep Scandinavian Airlines
06 Sep - 27 Sep Scandinavian Airlines
13 Sep - 21 Sep Scandinavian Airlines
19 Sep - 22 Sep Scandinavian Airlines
12 Sep - 27 Sep Scandinavian Airlines
27 Sep - 06 Oct Icelandair
19 Sep - 05 Oct Icelandair
27 Sep - 04 Oct Icelandair
28 Sep - 13 Oct Icelandair
25 Sep - 10 Oct Icelandair
27 Sep - 06 Oct British Airways direct
27 Sep - 04 Oct Air France direct
29 Sep - 05 Oct Scandinavian Airlines
19 Sep - 05 Oct British Airways direct
29 Sep - 05 Oct British Airways direct

Also check the deals for one-way flights from London to Washington in September.

Skyscanner

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

Book a cheap hotel in Washington

Cheap car rent in Washington