AirHint found the following cheapest return flights from Minneapolis (MSP) to Lisbon (LIS) in September 2025 (see full year).

Return flights

21 Sep - 02 Oct	Lufthansa
30 Sep - 08 Oct	Aer Lingus
30 Sep - 09 Oct	Aer Lingus
06 Sep - 27 Sep	Frontier Airlines
09 Sep - 17 Sep	Aer Lingus
01 Sep - 08 Sep	Spirit Airlines
08 Sep - 15 Sep	Spirit Airlines
28 Sep - 05 Oct	Icelandair
01 Sep - 13 Sep	Spirit Airlines

Also check the deals for one-way flights from Minneapolis to Lisbon 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 Minneapolis to Lisbon in September from 628€

Return flights