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

Return flights

24 Apr - 30 Apr	TAP
24 Apr - 01 May	TAP
30 Apr - 12 May	TAP
23 Apr - 15 May	TAP
29 Apr - 03 May	TAP
18 Apr - 29 Apr	TAP
17 Apr - 24 Apr	TAP
13 Apr - 22 Apr	TAP
16 Apr - 05 May	TAP
19 Apr - 15 May	TAP
23 Apr - 28 Apr	TAP
20 Apr - 28 Apr	TAP
23 Apr - 02 May	TAP
16 Apr - 19 Apr	Scandinavian Airlines
17 Apr - 20 Apr	Scandinavian Airlines
23 Apr - 26 Apr	Scandinavian Airlines
15 Apr - 22 Apr	Icelandair
29 Apr - 06 May	Icelandair
22 Apr - 05 May	Icelandair
26 Apr - 01 May	Icelandair

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 $433

Return flights