AirHint found the following cheapest return flights from New York (NYC) to London (LTN) in December 2025 (see full year).

Return flights

05 Dec - 14 Dec	Norse Atlantic Airways
05 Dec - 12 Dec	Aer Lingus
04 Dec - 09 Dec	Aer Lingus
01 Dec - 08 Dec	Aer Lingus
01 Dec - 06 Dec	Aer Lingus
04 Dec - 11 Dec	Aer Lingus
06 Dec - 14 Dec	Aer Lingus
04 Dec - 14 Dec	Aer Lingus
08 Dec - 14 Dec	Aer Lingus
07 Dec - 11 Dec	Iberia
11 Dec - 09 Jan	Aer Lingus
23 Dec - 02 Jan	Icelandair
15 Dec - 01 Jan	Aer Lingus
31 Dec - 24 Jan	Iberia
30 Dec - 06 Jan	Aer Lingus
30 Dec - 07 Jan	Aer Lingus
25 Dec - 06 Jan	Iberia
30 Dec - 10 Jan	Aer Lingus
17 Dec - 11 Jan	Aer Lingus
21 Dec - 04 Jan	Aer Lingus

Also check the deals for one-way flights from New York 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 New York to London in December from 418€

Return flights