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

Return flights

29 Jul - 12 Aug	Brussels Airlines
22 Jul - 27 Jul	Icelandair
20 Jul - 17 Aug	TAP
07 Jul - 23 Jul	Icelandair
14 Jul - 10 Aug	TAP
10 Jul - 21 Aug	TAP
20 Jul - 27 Jul	TAP
28 Jul - 03 Aug	TAP
30 Jul - 16 Aug	SWISS
22 Jul - 03 Aug	TAP
06 Jul - 13 Jul	TAP
23 Jul - 26 Jul	Icelandair
09 Jul - 13 Jul	TAP
01 Jul - 08 Jul	TAP
30 Jul - 15 Aug	TAP
01 Jul - 06 Jul	TAP
02 Jul - 08 Jul	Icelandair

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 $728

Return flights