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

Return flights

02 Dec - 09 Dec	Icelandair
02 Dec - 09 Dec	Lufthansa	direct
01 Dec - 08 Dec	Condor	direct
06 Dec - 13 Dec	Condor	direct
04 Dec - 11 Dec	Condor	direct
08 Dec - 15 Dec	Condor	direct
04 Dec - 14 Dec	Scandinavian Airlines
30 Dec - 06 Jan	Condor
05 Dec - 12 Dec	Lufthansa	direct
23 Dec - 30 Dec	Condor	direct
04 Dec - 12 Dec	WestJet
29 Dec - 05 Jan	Condor
25 Dec - 01 Jan	Condor	direct
16 Dec - 08 Jan	Icelandair
10 Dec - 03 Jan	WestJet
15 Dec - 07 Jan	Aer Lingus
15 Dec - 10 Jan	Condor	direct
20 Dec - 10 Jan	Condor	direct
27 Dec - 03 Jan	Condor	direct
12 Dec - 03 Jan	Air Canada

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 $506

Return flights