Cheapest one-way flights from Washington to London in December from $361

AirHint found the following cheapest one-way flights from Washington (DCA) to London (LHR) in December 2025 (see full year).

One-Way flights

31 Dec jetBlue
28 Dec jetBlue
30 Dec Air Canada
24 Dec Air Canada
27 Dec Air Canada
25 Dec United
26 Dec Air Canada
19 Dec jetBlue
23 Dec Air Canada
17 Dec jetBlue

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

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.