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

Return flights

02 May - 16 May	Flair Airlines
01 May - 16 May	Flair Airlines
18 May - 25 May	WestJet
18 May - 28 May	WestJet
18 May - 23 May	WestJet
18 May - 30 May	WestJet
17 May - 28 May	WestJet
25 May - 07 Jun	WestJet
16 May - 26 May	WestJet
16 May - 28 May	WestJet
16 May - 25 May	WestJet
25 May - 09 Jun	WestJet
29 May - 07 Jun	WestJet
30 May - 07 Jun	WestJet
24 May - 01 Jun	WestJet
24 May - 08 Jun	WestJet
14 May - 02 Jun	WestJet
26 May - 02 Jun	WestJet
06 May - 01 Jun	WestJet
27 May - 07 Jun	WestJet

Also check the deals for one-way flights from Waterloo 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 Waterloo to Lisbon in May from $593

Return flights