AirHint found the following cheapest return flights from Calgary (YYC) to Lisbon (LIS) in May 2026 (see full year).

Return flights

04 May - 11 May	Air Canada
06 May - 27 May	Air Canada
03 May - 12 May	Air Canada
11 May - 21 May	WestJet
12 May - 19 May	Air Canada
19 May - 02 Jun	Air Canada
12 May - 05 Jun	Air Canada
05 May - 26 May	Air Transat
13 May - 05 Jun	Air Canada
15 May - 31 May	WestJet
19 May - 30 May	Delta
08 May - 17 May	WestJet

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

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 Calgary to Lisbon in May from 516€

Return flights