Cheapest return flights from London to Washington in May from $539

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

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

Return flights

27 May - 09 Jun Icelandair
27 May - 23 Jun Icelandair
27 May - 02 Jun Icelandair
20 May - 26 May Ryanair
16 May - 04 Jun SWISS
18 May - 04 Jun SWISS
16 May - 24 May SWISS
17 May - 24 May SWISS
17 May - 18 May SWISS
21 May - 03 Jun Ryanair
22 May - 27 May Ryanair
23 May - 07 Jun SWISS
19 May - 25 May SWISS
31 May - 21 Jun Norse Atlantic Airways (UK)
20 May - 10 Jun SWISS
29 May - 07 Jun Delta
16 May - 23 May Austrian Airlines
19 May - 29 May SWISS
22 May - 26 May SWISS
16 May - 28 May Austrian Airlines

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