AirHint found the following cheapest return flights from Denver (DEN) to Lisbon (LIS) in January 2026 (see full year).

Return flights

14 Jan - 21 Jan	United
20 Jan - 27 Jan	United
27 Jan - 03 Feb	United
13 Jan - 20 Jan	United
21 Jan - 28 Jan	United
28 Jan - 04 Feb	United
07 Jan - 14 Jan	United
06 Jan - 13 Jan	Air France
12 Jan - 19 Jan	Lufthansa
19 Jan - 26 Jan	Lufthansa
26 Jan - 02 Feb	Lufthansa
11 Jan - 31 Jan	Brussels Airlines
15 Jan - 22 Jan	United
25 Jan - 01 Feb	United
29 Jan - 05 Feb	United
30 Jan - 06 Feb	United
31 Jan - 07 Feb	Air Canada

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

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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Cheapest return flights from Denver to Lisbon in January from $547

Return flights