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

Return flights

28 Jul - 17 Aug	SWISS
14 Jul - 29 Jul	Icelandair
14 Jul - 19 Jul	Icelandair
15 Jul - 29 Jul	Icelandair
07 Jul - 15 Jul	Icelandair
07 Jul - 21 Jul	Icelandair
26 Jul - 09 Aug	Aer Lingus
28 Jul - 04 Aug	SWISS
07 Jul - 28 Jul	Icelandair
13 Jul - 20 Jul	TAP
01 Jul - 05 Jul	Brussels Airlines
13 Jul - 17 Jul	TAP
29 Jul - 03 Aug	SWISS
20 Jul - 27 Jul	TAP
25 Jul - 09 Aug	SWISS
19 Jul - 02 Aug	TAP
25 Jul - 01 Aug	Aer Lingus
22 Jul - 08 Aug	Delta

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

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 July from 607€

Return flights