Cheapest one-way flights from Washington to London in December from $346

Best time to book flights for Washington (IAD) to London (LHR) flights at AirHint

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

One-Way flights

24 Dec Icelandair
22 Dec TAP
13 Dec TAP
26 Dec Icelandair
24 Dec American Airlines direct
17 Dec Iberia direct
13 Dec American Airlines direct
25 Dec British Airways direct
26 Dec Iberia direct
22 Dec Iberia direct

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

Skyscanner

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.

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