Cheapest return flights from Washington to London in May from $540

Best time to book flights for Washington (IAD) to London (LHR) flights at AirHint

AirHint found the following cheapest return flights from Washington (IAD) to London (LHR) in May 2025 (see full year).

Return flights

04 May - 19 May Icelandair
03 May - 17 May Icelandair
14 May - 19 May Scandinavian Airlines
09 May - 19 May Icelandair
06 May - 13 May Scandinavian Airlines
05 May - 21 May Scandinavian Airlines
06 May - 12 May Scandinavian Airlines
13 May - 21 May Scandinavian Airlines
12 May - 20 May Scandinavian Airlines
01 May - 05 May Icelandair
20 May - 10 Jun Icelandair
20 May - 07 Jun Icelandair
19 May - 04 Jun British Airways direct
30 May - 08 Jun Icelandair
20 May - 10 Jun British Airways direct
26 May - 09 Jun Icelandair
20 May - 07 Jun British Airways direct
26 May - 02 Jun Icelandair
24 May - 01 Jun Icelandair
25 May - 01 Jun Icelandair

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

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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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