Cheapest return flights from Denver to Lisbon in April from $629

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

Return flights

15 Apr - 22 Apr Air Canada
18 Apr - 02 May Air Canada
29 Apr - 06 May Finnair
12 Apr - 26 Apr Turkish Airlines
22 Apr - 02 May Lufthansa
20 Apr - 27 Apr Icelandair
22 Apr - 26 Apr Air Canada
16 Apr - 23 Apr Turkish Airlines
13 Apr - 26 Apr Air Canada
17 Apr - 24 Apr Icelandair
19 Apr - 26 Apr Turkish Airlines
06 Apr - 13 Apr United

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

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