Cheapest one-way flights from Washington to London in April from $323

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

One-Way flights

15 Apr Icelandair
18 Apr TAP
17 Apr TAP
22 Apr TAP
22 Apr American Airlines direct
19 Apr Delta direct
29 Apr American Airlines direct
23 Apr Icelandair
17 Apr British Airways direct
18 Apr British Airways direct

Also check the deals for return flights from Washington to London in April.

Powered by

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

Feel free to contact us with any feedback or request another flight research.