AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in March 2026 (see full year).
Return flights
| 30 Mar - 06 Apr | British Airways | ||
| 14 Mar - 22 Mar | Icelandair | ||
| 16 Mar - 20 Mar | KLM | ||
| 11 Mar - 21 Mar | Air Canada | ||
| 06 Mar - 20 Mar | British Airways |
Also check the deals for one-way flights from Denver to Lisbon in March.
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