AirHint found the following cheapest return flights from Lisbon (LIS) to Helsinki (HEL) in October 2025 (see full year).

Return flights

30 Oct - 04 Nov	easyJet
31 Oct - 07 Nov	TAP
30 Oct - 03 Nov	easyJet
29 Oct - 02 Nov	easyJet
30 Oct - 05 Nov	easyJet
31 Oct - 05 Nov	Ryanair
29 Oct - 01 Nov	Volotea
30 Oct - 02 Nov	easyJet
31 Oct - 09 Nov	Ryanair
22 Oct - 28 Oct	Ryanair
22 Oct - 29 Oct	Ryanair
23 Oct - 27 Oct	easyJet
25 Oct - 02 Nov	Ryanair
22 Oct - 26 Oct	Transavia France
23 Oct - 26 Oct	Ryanair
22 Oct - 25 Oct	Transavia France
21 Oct - 22 Oct	Ryanair
24 Oct - 31 Oct	TAP
20 Oct - 27 Oct	Ryanair
24 Oct - 29 Oct	TAP

Also check the deals for one-way flights from Lisbon to Helsinki in October.

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 Lisbon to Helsinki in October from $277

Return flights