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

Return flights

29 Sep - 09 Oct	Frontier Airlines
22 Sep - 29 Sep	Frontier Airlines
24 Sep - 18 Oct	Spirit Airlines
19 Sep - 30 Sep	Turkish Airlines
21 Sep - 28 Sep	Frontier Airlines
18 Sep - 11 Oct	Spirit Airlines
18 Sep - 19 Sep	Frontier Airlines
29 Sep - 09 Oct	Lufthansa	direct
30 Sep - 05 Oct	United
24 Sep - 18 Oct	Lufthansa	direct
25 Sep - 29 Sep	Lufthansa	direct
19 Sep - 30 Sep	Lufthansa	direct
21 Sep - 28 Sep	Lufthansa	direct
22 Sep - 29 Sep	Lufthansa	direct
18 Sep - 11 Oct	Lufthansa	direct
18 Sep - 19 Sep	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 $755

Return flights