Cheapest return flights from Washington to London in August from $651

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

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

Return flights

18 Aug - 28 Aug SWISS
11 Aug - 20 Aug SWISS
13 Aug - 27 Aug SWISS
06 Aug - 13 Aug SWISS
10 Aug - 21 Aug ITA Airways
14 Aug - 25 Aug ITA Airways
22 Aug - 25 Aug ITA Airways
01 Aug - 20 Aug ITA Airways
21 Aug - 26 Aug SWISS
21 Aug - 25 Aug SWISS
28 Aug - 05 Sep Lufthansa
28 Aug - 03 Sep Lufthansa
28 Aug - 15 Sep Lufthansa
22 Aug - 05 Sep ITA Airways
14 Aug - 07 Sep ITA Airways
30 Aug - 12 Sep SWISS
31 Aug - 04 Sep ITA Airways
23 Aug - 06 Sep ITA Airways
29 Aug - 02 Sep KLM
29 Aug - 08 Sep ITA Airways

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

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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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