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

Return flights

02 Apr - 05 Apr	Icelandair
16 Apr - 22 Apr	Scandinavian Airlines
08 Apr - 15 Apr	Icelandair
02 Apr - 06 Apr	Icelandair
11 Apr - 18 Apr	Icelandair
08 Apr - 15 Apr	British Airways	direct
05 Apr - 12 Apr	Icelandair
05 Apr - 12 Apr	British Airways	direct
16 Apr - 22 Apr	British Airways	direct
22 Apr - 27 Apr	British Airways	direct
22 Apr - 03 May	British Airways	direct

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

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 April from 519€

Return flights