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

Return flights

09 Mar - 18 Mar	TAP
02 Mar - 17 Mar	Icelandair
23 Mar - 30 Mar	Icelandair
10 Mar - 17 Mar	Icelandair
18 Mar - 24 Mar	Icelandair
09 Mar - 16 Mar	TAP
04 Mar - 10 Mar	Icelandair
03 Mar - 10 Mar	Icelandair
04 Mar - 11 Mar	Icelandair
16 Mar - 23 Mar	Air Canada
21 Mar - 18 Apr	Scandinavian Airlines
25 Mar - 01 Apr	Delta
30 Mar - 07 Apr	SWISS
31 Mar - 06 Apr	Brussels Airlines
29 Mar - 07 Apr	KLM	direct
30 Mar - 07 Apr	Delta	direct
30 Mar - 08 Apr	British Airways	direct
25 Mar - 07 Apr	United	direct
26 Mar - 09 Apr	United
26 Mar - 14 Apr	United

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 359€

Return flights