AirHint found the following cheapest return flights from Helsinki (HEL) to Singapore (SIN) in September 2025 (see full year).

Return flights

11 Sep - 25 Sep	IndiGo
10 Sep - 21 Sep	IndiGo
11 Sep - 18 Sep	IndiGo
29 Sep - 20 Oct	Lufthansa
29 Sep - 21 Oct	Lufthansa
29 Sep - 22 Oct	Lufthansa
27 Sep - 27 Oct	Lufthansa
29 Sep - 19 Oct	Lufthansa
26 Sep - 05 Oct	IndiGo
11 Sep - 18 Sep	Finnair	direct
11 Sep - 25 Sep	Finnair	direct
07 Sep - 04 Oct	Lufthansa
27 Sep - 18 Oct	IndiGo
28 Sep - 18 Oct	IndiGo
29 Sep - 18 Oct	IndiGo
10 Sep - 21 Sep	Finnair	direct
15 Sep - 28 Sep	Scandinavian Airlines

Also check the deals for one-way flights from Helsinki to Singapore in September.

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 Helsinki to Singapore in September from $613

Return flights