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

Return flights

21 Apr - 16 May	Icelandair
15 Apr - 20 Apr	Icelandair
08 Apr - 15 Apr	Icelandair
23 Apr - 27 Apr	Icelandair
03 Apr - 13 Apr	Icelandair
24 Apr - 27 Apr	Icelandair
13 Apr - 27 Apr	Icelandair
16 Apr - 21 Apr	Icelandair
09 Apr - 12 Apr	Icelandair
17 Apr - 24 Apr	Icelandair
05 Apr - 10 Apr	Icelandair
30 Apr - 04 May	Icelandair
12 Apr - 02 May	Icelandair
15 Apr - 09 May	Icelandair
12 Apr - 01 May	Icelandair
11 Apr - 02 May	Icelandair
22 Apr - 16 May	Icelandair
30 Apr - 23 May	Icelandair
28 Apr - 01 May	Aer Lingus

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 $533

Return flights