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

Return flights

18 Aug - 31 Aug	Alaska Airlines
17 Aug - 31 Aug	Condor
11 Aug - 25 Aug	Condor	direct
07 Aug - 21 Aug	Condor	direct
03 Aug - 20 Aug	Condor	direct
27 Aug - 10 Sep	Condor	direct
05 Aug - 12 Aug	Condor	direct
17 Aug - 25 Aug	Condor	direct
23 Aug - 31 Aug	Condor
08 Aug - 12 Aug	Condor
17 Aug - 31 Aug	Condor	direct
31 Aug - 07 Sep	Lufthansa	direct
29 Aug - 05 Sep	Lufthansa	direct

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

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 August from $560

Return flights