AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in July 2026 (see full year).
Return flights
| 15 Jul - 20 Aug | Delta | ||
| 22 Jul - 01 Aug | Air Canada | ||
| 19 Jul - 26 Jul | British Airways | ||
| 15 Jul - 26 Jul | Lufthansa | ||
| 10 Jul - 18 Jul | Turkish Airlines | ||
| 05 Jul - 15 Jul | Lufthansa | ||
| 02 Jul - 05 Jul | jetBlue |
Also check the deals for one-way flights from Denver to Lisbon in July.
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