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

Return flights

25 Dec - 08 Jan	Condor	direct
04 Dec - 14 Dec	Icelandair
03 Dec - 10 Dec	Icelandair
02 Dec - 16 Dec	Lufthansa	direct
05 Dec - 19 Dec	Lufthansa	direct
13 Dec - 20 Dec	Icelandair
23 Dec - 05 Jan	Condor	direct
22 Dec - 05 Jan	British Airways
16 Dec - 31 Dec	United
22 Dec - 05 Jan	Condor	direct
18 Dec - 03 Jan	Condor	direct

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 569€

Return flights