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

Return flights

27 Apr - 19 May	TAP
17 Apr - 24 Apr	TAP
24 Apr - 30 Apr	TAP
14 Apr - 21 Apr	TAP
29 Apr - 08 May	TAP
15 Apr - 22 Apr	TAP
29 Apr - 04 May	TAP
12 Apr - 19 Apr	Icelandair
07 Apr - 12 Apr	Icelandair
21 Apr - 28 Apr	Icelandair
16 Apr - 25 Apr	Icelandair
16 Apr - 19 Apr	Icelandair
08 Apr - 13 Apr	Icelandair
15 Apr - 03 May	Icelandair
30 Apr - 05 May	Scandinavian Airlines
30 Apr - 04 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.

Book a cheap hotel in London

Cheap car rent in London

Cheapest return flights from Washington to London in April from $435

Return flights