AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in April 2026 (see full year).
Return flights
| 15 Apr - 29 Apr | Lufthansa | ||
| 09 Apr - 24 Apr | Lufthansa | ||
| 16 Apr - 01 May | Air Canada | ||
| 23 Apr - 26 Apr | Turkish Airlines | ||
| 17 Apr - 26 Apr | Frontier Airlines | ||
| 30 Apr - 19 May | Turkish Airlines |
Also check the deals for one-way flights from Denver to Lisbon in April.
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