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

Return flights

05 Dec - 07 Dec	jetBlue
08 Dec - 16 Dec	Delta
09 Dec - 16 Dec	Delta
31 Dec - 07 Jan	KLM
06 Dec - 07 Dec	jetBlue
30 Dec - 06 Jan	jetBlue
22 Dec - 31 Dec	Frontier Airlines
18 Dec - 01 Jan	Allegiant Air
19 Dec - 10 Jan	Frontier Airlines
19 Dec - 12 Jan	Air Canada
20 Dec - 28 Dec	United

Also check the deals for one-way flights from Syracuse 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 Syracuse to London in December from $498

Return flights