AirHint found the following cheapest return flights from Bucharest (OTP) to Lisbon (LIS) in September 2025 (see full year).

Return flights

29 Sep - 03 Oct	Ryanair
22 Sep - 25 Sep	Ryanair
16 Sep - 30 Sep	Ryanair
18 Sep - 25 Sep	Ryanair
17 Sep - 01 Oct	Ryanair
22 Sep - 29 Sep	Ryanair
29 Sep - 04 Oct	Ryanair
17 Sep - 23 Sep	Ryanair
16 Sep - 24 Sep	Ryanair
30 Sep - 04 Oct	Ryanair
19 Sep - 24 Sep	Ryanair
19 Sep - 03 Oct	Ryanair
19 Sep - 26 Sep	Ryanair
10 Sep - 17 Sep	Ryanair
11 Sep - 16 Sep	Ryanair
20 Sep - 04 Oct	Ryanair
12 Sep - 01 Oct	Wizz Air Malta	direct
19 Sep - 01 Oct	Wizz Air Malta	direct
26 Sep - 01 Oct	Wizz Air Malta	direct
17 Sep - 01 Oct	Wizz Air Malta	direct

Also check the deals for one-way flights from Bucharest 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 Bucharest to Lisbon in September from $181

Return flights