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

Return flights

27 Aug - 01 Sep	TAP
05 Aug - 19 Aug	SWISS
28 Aug - 15 Sep	TAP
05 Aug - 12 Aug	TAP
31 Aug - 04 Sep	TAP
07 Aug - 14 Aug	Brussels Airlines
02 Aug - 09 Aug	TAP
03 Aug - 12 Aug	TAP
16 Aug - 23 Aug	Aer Lingus

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 559€

Return flights