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

Return flights

03 Sep - 08 Sep	United
20 Sep - 30 Sep	United
20 Sep - 27 Sep	United
05 Sep - 12 Sep	United
03 Sep - 31 Oct	United
06 Sep - 13 Sep	United
26 Sep - 03 Oct	United
24 Sep - 01 Oct	WestJet
10 Sep - 17 Sep	United
19 Sep - 26 Sep	United
03 Sep - 10 Sep	WestJet
14 Sep - 28 Sep	Air Transat	direct
21 Sep - 28 Sep	Air Transat	direct
28 Sep - 05 Oct	Air Transat	direct
21 Sep - 12 Oct	Air Transat	direct
28 Sep - 19 Oct	Air Transat	direct
28 Sep - 08 Oct	Air Transat
25 Sep - 02 Oct	United
23 Sep - 03 Oct	United
29 Sep - 06 Oct	United

Also check the deals for one-way flights from Montreal to Liberia 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 Liberia in September from $290

Return flights