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

Return flights

20 May - 26 May	Etihad Airways
27 May - 03 Jun	Etihad Airways
26 May - 01 Jun	Air France
24 May - 01 Jun	Etihad Airways
06 May - 16 May	Etihad Airways
18 May - 12 Jun	Finnair
21 May - 26 May	Finnair
10 May - 15 May	Turkish Airlines
23 May - 31 May	KLM
23 May - 07 Jun	KLM
15 May - 31 May	Finnair
23 May - 26 May	Etihad Airways
23 May - 27 May	Etihad Airways
01 May - 09 May	Turkish Airlines
27 May - 06 Jun	Air France
22 May - 29 May	Turkish Airlines
22 May - 01 Jun	Finnair
22 May - 07 Jun	Turkish Airlines

Also check the deals for one-way flights from Singapore 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 Singapore to Lisbon in May from $601

Return flights