Cheapest return flights from St. Louis to Lisbon in September from $827

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

Return flights

29 Sep - 06 Oct United
17 Sep - 24 Sep United
02 Sep - 09 Sep United
23 Sep - 30 Sep United
14 Sep - 21 Sep United
08 Sep - 15 Sep United
05 Sep - 12 Sep United
11 Sep - 18 Sep United
26 Sep - 03 Oct United
20 Sep - 27 Sep United

Also check the deals for one-way flights from St. Louis to Lisbon in September.

Skyscanner

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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