AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in September 2026 (see full year).
Return flights
| 22 Sep - 29 Sep | Air Canada | ||
| 23 Sep - 30 Sep | British Airways | ||
| 18 Sep - 25 Sep | British Airways | ||
| 27 Sep - 04 Oct | British Airways | ||
| 26 Sep - 03 Oct | Air France |
Also check the deals for one-way flights from Denver to Lisbon in September.
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