AirHint found the following cheapest return flights from Dallas (DAL) to London (LHR) in December 2025 (see full year).

Return flights

29 Dec - 20 Jan	Air France
30 Dec - 16 Jan	Air France
30 Dec - 14 Jan	Air France
30 Dec - 20 Jan	Air France
03 Dec - 08 Dec	Air France
09 Dec - 14 Dec	KLM
08 Dec - 15 Dec	Air France
03 Dec - 07 Dec	Air France
03 Dec - 13 Dec	Air France
05 Dec - 19 Dec	Air France
29 Dec - 24 Jan	Air France
29 Dec - 18 Jan	Air France
15 Dec - 13 Jan	Air France
28 Dec - 19 Jan	Air France
13 Dec - 22 Dec	Air France
11 Dec - 28 Dec	Delta
23 Dec - 30 Dec	Delta
13 Dec - 07 Jan	Air France
26 Dec - 08 Jan	Delta
19 Dec - 26 Dec	Air France

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

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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Cheapest return flights from Dallas to London in December from $651

Return flights