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

Return flights

15 Sep - 30 Sep	Frontier Airlines
22 Sep - 06 Oct	Spirit Airlines
10 Sep - 15 Sep	Frontier Airlines
05 Sep - 12 Sep	Frontier Airlines
20 Sep - 27 Sep	Spirit Airlines
20 Sep - 11 Oct	Spirit Airlines
16 Sep - 11 Oct	Spirit Airlines
16 Sep - 16 Oct	Spirit Airlines
12 Sep - 28 Sep	Turkish Airlines
05 Sep - 07 Sep	Spirit Airlines
08 Sep - 16 Sep	Lufthansa	direct
15 Sep - 22 Sep	Condor
04 Sep - 15 Sep	Alaska Airlines
10 Sep - 01 Oct	Lufthansa	direct
16 Sep - 21 Sep	Lufthansa	direct
16 Sep - 16 Oct	Lufthansa	direct
16 Sep - 11 Oct	Lufthansa	direct
22 Sep - 06 Oct	Lufthansa	direct
30 Sep - 05 Oct	United
20 Sep - 11 Oct	Lufthansa	direct

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

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 Houston to Frankfurt in September from $739

Return flights