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

Return flights

17 Apr - 19 Apr	Scandinavian Airlines
16 Apr - 23 Apr	TAP
26 Apr - 10 May	TAP
02 Apr - 12 Apr	Icelandair
02 Apr - 07 Apr	Icelandair
12 Apr - 22 Apr	Icelandair
02 Apr - 09 Apr	Icelandair
15 Apr - 20 Apr	Icelandair
14 Apr - 30 Apr	Icelandair
13 Apr - 20 Apr	Icelandair
15 Apr - 21 Apr	Icelandair
30 Apr - 05 May	Icelandair
22 Apr - 05 May	Icelandair
16 Apr - 01 May	TAP
28 Apr - 03 May	Icelandair
23 Apr - 15 May	Icelandair
24 Apr - 09 May	TAP
30 Apr - 12 May	Icelandair
19 Apr - 15 May	United
23 Apr - 03 May	Scandinavian Airlines

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 383€

Return flights