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

Return flights

26 Apr - 08 May	TAP
13 Apr - 19 Apr	TAP
14 Apr - 22 Apr	Icelandair
19 Apr - 24 Apr	Icelandair
14 Apr - 21 Apr	Icelandair
20 Apr - 05 May	Icelandair
08 Apr - 19 Apr	Icelandair
23 Apr - 27 Apr	Icelandair
06 Apr - 16 Apr	Icelandair
13 Apr - 18 Apr	Icelandair
08 Apr - 15 Apr	Icelandair
21 Apr - 29 Apr	Icelandair
12 Apr - 02 May	Icelandair
12 Apr - 01 May	Icelandair
25 Apr - 02 May	Icelandair
29 Apr - 06 May	Icelandair
30 Apr - 07 May	Icelandair
29 Apr - 04 May	Scandinavian Airlines
12 Apr - 01 May	American Airlines	direct
29 Apr - 06 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Washington to London in April from $436

Return flights