Cheapest return flights from London to Washington in December from $606

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

AirHint found the following cheapest return flights from London (LON) to Washington (IAD) in December 2025 (see full year).

Return flights

30 Dec - 09 Jan Scandinavian Airlines
17 Dec - 29 Dec Lufthansa
15 Dec - 05 Jan Austrian Airlines
17 Dec - 03 Jan Lufthansa
17 Dec - 07 Jan Lufthansa
02 Dec - 16 Dec British Airways
26 Dec - 30 Dec Scandinavian Airlines
12 Dec - 15 Dec Lufthansa
02 Dec - 16 Dec Finnair direct
30 Dec - 09 Jan British Airways direct
28 Dec - 04 Jan British Airways direct
13 Dec - 06 Jan British Airways direct
13 Dec - 21 Dec Delta
26 Dec - 03 Jan SWISS
11 Dec - 18 Dec Delta
24 Dec - 01 Jan Austrian Airlines
23 Dec - 09 Jan Scandinavian Airlines
11 Dec - 18 Dec Finnair direct
13 Dec - 21 Dec Austrian Airlines direct
17 Dec - 28 Dec British Airways

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

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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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