AirHint found the following cheapest return flights from Seattle (SEA) to Frankfurt (FRA) in December 2025 (see full year).

Return flights

01 Dec - 08 Dec	Condor	direct
01 Dec - 15 Dec	Icelandair
25 Dec - 17 Jan	Condor	direct
04 Dec - 14 Dec	Icelandair
24 Dec - 17 Jan	Condor	direct
08 Dec - 23 Dec	Condor	direct
03 Dec - 10 Dec	Icelandair
09 Dec - 16 Dec	Lufthansa
01 Dec - 15 Dec	Lufthansa	direct
15 Dec - 10 Jan	Air Canada
01 Dec - 27 Dec	Air Canada
01 Dec - 27 Dec	Condor	direct
10 Dec - 22 Dec	Lufthansa
30 Dec - 24 Jan	Condor	direct
12 Dec - 05 Jan	Frontier Airlines
23 Dec - 06 Jan	Air Canada
15 Dec - 05 Jan	Hawaiian Airlines
13 Dec - 04 Jan	Hawaiian Airlines
14 Dec - 04 Jan	Hawaiian Airlines
11 Dec - 03 Jan	Frontier Airlines

Also check the deals for one-way flights from Seattle to Frankfurt 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 Seattle to Frankfurt in December from $544

Return flights