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

Return flights

18 Aug - 25 Aug	KLM
07 Aug - 04 Sep	jetBlue
07 Aug - 28 Aug	Virgin Atlantic
17 Aug - 09 Sep	jetBlue
06 Aug - 12 Aug	Air Canada
06 Aug - 14 Aug	American Airlines
06 Aug - 15 Aug	American Airlines
11 Aug - 20 Aug	jetBlue
13 Aug - 19 Aug	jetBlue
07 Aug - 26 Aug	jetBlue
17 Aug - 24 Aug	British Airways
01 Aug - 13 Aug	British Airways
25 Aug - 04 Sep	jetBlue
29 Aug - 06 Sep	Virgin Atlantic
28 Aug - 06 Sep	Virgin Atlantic
27 Aug - 09 Sep	jetBlue
25 Aug - 02 Sep	jetBlue
29 Aug - 02 Sep	American Airlines
09 Aug - 03 Sep	jetBlue
08 Aug - 03 Sep	jetBlue

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

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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Cheapest return flights from Washington to London in August from $531

Return flights