Cheapest return flights from Seattle to Frankfurt in September from $549

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

Return flights

21 Sep - 02 Oct Scandinavian Airlines
05 Sep - 19 Sep Condor
24 Sep - 30 Sep Scandinavian Airlines
10 Sep - 23 Sep Scandinavian Airlines
08 Sep - 22 Sep Condor direct
05 Sep - 19 Sep Condor direct
10 Sep - 23 Sep Condor direct
08 Sep - 15 Sep Condor direct
24 Sep - 30 Sep Condor direct
21 Sep - 02 Oct Condor direct
17 Sep - 21 Sep Condor
17 Sep - 24 Sep Condor
25 Sep - 14 Oct Aer Lingus
27 Sep - 03 Oct Turkish Airlines
27 Sep - 03 Oct Condor direct

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

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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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