Cheapest one-way flights from Denver to Lisbon in December from $451

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

One-Way flights

01 Dec British Airways
28 Dec Delta
16 Dec Frontier Airlines

Also check the deals for return flights from Denver to Lisbon in December.

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The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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