AirHint found the following cheapest return flights from St. Louis (STL) to Lisbon (LIS) in December 2025 (see full year).
Return flights
| 04 Dec - 11 Dec | Delta | ||
| 19 Dec - 29 Dec | Frontier Airlines | ||
| 20 Dec - 29 Dec | Frontier Airlines | ||
| 19 Dec - 28 Dec | Frontier Airlines |
Also check the deals for one-way flights from St. Louis to Lisbon in December.
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