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

Return flights

15 Sep - 22 Sep	FrenchBee
22 Sep - 29 Sep	FrenchBee
02 Sep - 09 Sep	Air Transat
10 Sep - 17 Sep	FrenchBee
17 Sep - 24 Sep	FrenchBee
16 Sep - 23 Sep	Porter Airlines (Canada) Ltd
03 Sep - 10 Sep	FrenchBee
21 Sep - 28 Sep	Porter Airlines (Canada) Ltd
14 Sep - 21 Sep	Air Transat
09 Sep - 16 Sep	Porter Airlines (Canada) Ltd
13 Sep - 01 Oct	Air Transat
26 Sep - 09 Oct	Air Transat
30 Sep - 07 Oct	Air Transat
28 Sep - 05 Oct	Air Transat
28 Sep - 11 Oct	Air Transat
29 Sep - 06 Oct	FrenchBee
27 Sep - 04 Oct	Air Transat
24 Sep - 01 Oct	FrenchBee
26 Sep - 03 Oct	FrenchBee
17 Sep - 09 Oct	Air Transat

Also check the deals for one-way flights from Montreal to Bucharest 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 Montreal to Bucharest in September from 522€

Return flights