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

Return flights

19 Aug - 12 Sep	Scandinavian Airlines
20 Aug - 12 Sep	Scandinavian Airlines
06 Aug - 20 Aug	British Airways	direct
19 Aug - 12 Sep	Iberia	direct
21 Aug - 12 Sep	Iberia	direct
01 Aug - 14 Aug	United
15 Aug - 22 Aug	SWISS
01 Aug - 14 Aug	Finnair	direct
15 Aug - 22 Aug	Finnair	direct
20 Aug - 12 Sep	British Airways	direct
02 Aug - 08 Aug	Austrian Airlines
01 Aug - 08 Aug	British Airways	direct
03 Aug - 08 Aug	British Airways	direct
02 Aug - 08 Aug	British Airways	direct

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 $607

Return flights