Cheapest return flights from Washington to London in April from $545

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

Return flights

30 Apr - 03 May Scandinavian Airlines
08 Apr - 17 Apr Scandinavian Airlines
23 Apr - 02 May Scandinavian Airlines
23 Apr - 15 May Scandinavian Airlines
23 Apr - 21 May Scandinavian Airlines
08 Apr - 02 May Scandinavian Airlines
15 Apr - 05 May Scandinavian Airlines
29 Apr - 09 May Scandinavian Airlines
06 Apr - 15 Apr Icelandair
06 Apr - 13 Apr Icelandair
16 Apr - 23 Apr Icelandair
23 Apr - 16 May Icelandair
26 Apr - 03 May Icelandair
08 Apr - 17 Apr American Airlines direct
06 Apr - 15 Apr British Airways direct
21 Apr - 26 Apr Aer Lingus
06 Apr - 13 Apr British Airways direct
16 Apr - 23 Apr British Airways direct
23 Apr - 15 May American Airlines direct

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

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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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