AirHint found the following cheapest return flights from Oslo (OSL) to Lisbon (LIS) in September 2026 (see full year).

Return flights

05 Sep - 09 Sep	Vueling Airlines
05 Sep - 09 Sep	Norwegian	direct
01 Sep - 15 Sep	TAP	direct
19 Sep - 28 Sep	KLM
04 Sep - 08 Sep	Transavia France
26 Sep - 03 Oct	Ryanair
19 Sep - 28 Sep	TAP	direct
05 Sep - 14 Sep	Norwegian
11 Sep - 14 Sep	transavia
01 Sep - 09 Sep	Norwegian
04 Sep - 08 Sep	TAP	direct
26 Sep - 03 Oct	TAP	direct
25 Sep - 04 Oct	transavia
25 Sep - 04 Oct	TAP	direct

Also check the deals for one-way flights from Oslo to Lisbon 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 Oslo to Lisbon in September from $197

Return flights