Cheapest return flights from Washington to London in September from $497

AirHint found the following cheapest return flights from Washington (IAD) to London (LHR) in September 2026 (see full year).

Return flights

25 Sep - 28 Sep Scandinavian Airlines
25 Sep - 03 Oct Scandinavian Airlines
20 Sep - 29 Sep Scandinavian Airlines
14 Sep - 20 Sep Scandinavian Airlines
21 Sep - 26 Sep Scandinavian Airlines
06 Sep - 16 Sep Scandinavian Airlines
01 Sep - 14 Sep Air Canada
06 Sep - 18 Sep Scandinavian Airlines
02 Sep - 22 Sep Delta
01 Sep - 15 Sep Delta
29 Sep - 05 Oct Iberia
22 Sep - 30 Sep Lufthansa
29 Sep - 05 Oct American Airlines direct
25 Sep - 03 Oct British Airways direct

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

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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.

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