AirHint found the following cheapest return flights from Detroit (DTW) to Barcelona (BCN) in September 2025 (see full year).

Return flights

23 Sep - 30 Sep	Spirit Airlines
30 Sep - 08 Oct	Spirit Airlines
05 Sep - 12 Sep	Spirit Airlines
03 Sep - 23 Sep	Spirit Airlines
08 Sep - 14 Sep	Spirit Airlines
21 Sep - 07 Oct	Spirit Airlines
05 Sep - 13 Sep	Spirit Airlines
06 Sep - 13 Sep	Spirit Airlines
25 Sep - 06 Oct	Spirit Airlines
13 Sep - 20 Sep	Spirit Airlines
12 Sep - 07 Oct	Spirit Airlines
14 Sep - 21 Sep	Spirit Airlines

Also check the deals for one-way flights from Detroit to Barcelona 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 Detroit to Barcelona in September from $420

Return flights