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

Return flights

15 Oct - 29 Oct	Condor
17 Oct - 24 Oct	Condor
10 Oct - 25 Oct	Condor
01 Oct - 06 Oct	Condor	direct
17 Oct - 24 Oct	Condor	direct
18 Oct - 01 Nov	Condor	direct
10 Oct - 25 Oct	Condor	direct
11 Oct - 25 Oct	Condor	direct
31 Oct - 07 Nov	Icelandair
21 Oct - 28 Oct	Lufthansa	direct
31 Oct - 07 Nov	Lufthansa	direct

Also check the deals for one-way flights from Seattle to Frankfurt in October.

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 October from $600

Return flights