AirHint found the following cheapest return flights from Phoenix (PHX) to London (LGW) in December 2025 (see full year).

Return flights

08 Dec - 13 Dec	Frontier Airlines
07 Dec - 14 Dec	Spirit Airlines
09 Dec - 06 Jan	Spirit Airlines
03 Dec - 12 Jan	Air Canada
24 Dec - 29 Dec	Air Canada
12 Dec - 14 Jan	Air Canada
19 Dec - 10 Jan	Sun Country Airlines
14 Dec - 19 Dec	Spirit Airlines
25 Dec - 04 Jan	Sun Country Airlines
23 Dec - 31 Dec	Air Canada
24 Dec - 31 Dec	Turkish Airlines
24 Dec - 04 Jan	Turkish Airlines
07 Dec - 23 Dec	Spirit Airlines
20 Dec - 25 Dec	Sun Country Airlines
14 Dec - 02 Jan	Spirit Airlines
26 Dec - 16 Jan	Turkish Airlines
19 Dec - 27 Dec	Sun Country Airlines
31 Dec - 05 Jan	WestJet
14 Dec - 28 Dec	Hawaiian Airlines
30 Dec - 03 Jan	WestJet

Also check the deals for one-way flights from Phoenix 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 Phoenix to London in December from $718

Return flights