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

Return flights

04 Mar - 11 Mar	TAP
02 Mar - 08 Mar	TAP
30 Mar - 25 Apr	TAP
02 Mar - 05 Mar	Scandinavian Airlines
01 Mar - 08 Mar	Icelandair
02 Mar - 07 Mar	Icelandair
02 Mar - 06 Mar	Icelandair
01 Mar - 07 Mar	Icelandair
05 Mar - 09 Mar	Icelandair
14 Mar - 22 Mar	Icelandair
05 Mar - 13 Mar	Icelandair
31 Mar - 07 Apr	TAP
10 Mar - 04 Apr	Icelandair
15 Mar - 04 Apr	Icelandair
25 Mar - 04 Apr	Icelandair
25 Mar - 01 Apr	Icelandair
31 Mar - 06 Apr	Icelandair
11 Mar - 04 Apr	Icelandair
19 Mar - 11 Apr	Icelandair
21 Mar - 18 Apr	Icelandair

Also check the deals for one-way flights from Washington to London in March.

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 March from $424

Return flights