Cheapest return flights from Denver to Lisbon in May from $676

Best time to book flights for Denver (DEN) to Lisbon (LIS) flights at AirHint

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

Return flights

05 May - 11 May Frontier Airlines
13 May - 20 May WestJet
06 May - 13 May Frontier Airlines
01 May - 06 May Frontier Airlines
14 May - 21 May British Airways
12 May - 04 Jun Frontier Airlines
17 May - 24 May Frontier Airlines
01 May - 12 May Frontier Airlines
15 May - 22 May British Airways
18 May - 25 May Frontier Airlines
16 May - 23 May Frontier Airlines
13 May - 03 Jun WestJet
14 May - 02 Jun Icelandair
31 May - 07 Jun Frontier Airlines
15 May - 15 Jun Turkish Airlines

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

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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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