Cheapest return flights from Denver to Lisbon in December from $544

AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in December 2025 (see full year).

Return flights

09 Dec - 16 Dec Air Canada
08 Dec - 15 Dec Lufthansa
05 Dec - 12 Dec Air Canada
13 Dec - 23 Jan British Airways
16 Dec - 23 Dec KLM
07 Dec - 12 Dec KLM
23 Dec - 30 Dec British Airways
29 Dec - 02 Jan Lufthansa
29 Dec - 03 Jan Lufthansa
26 Dec - 02 Jan British Airways

Also check the deals for one-way flights from Denver to Lisbon in December.

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