AirHint found the following cheapest return flights from Singapore (SIN) to Lisbon (LIS) in July 2025 (see full year).

Return flights

16 Jul - 23 Jul	KLM
20 Jul - 27 Jul	Qatar Airways
21 Jul - 27 Jul	Qatar Airways
19 Jul - 21 Jul	Qatar Airways
17 Jul - 24 Jul	KLM
26 Jul - 09 Aug	IndiGo
22 Jul - 04 Aug	IndiGo
21 Jul - 04 Aug	IndiGo
28 Jul - 31 Jul	Etihad Airways
17 Jul - 31 Jul	IndiGo
12 Jul - 20 Jul	IndiGo

Also check the deals for one-way flights from Singapore to Lisbon in July.

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 July from 761€

Return flights