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

Return flights

20 Sep - 27 Sep	United
27 Sep - 04 Oct	United
19 Sep - 26 Sep	United
18 Sep - 24 Sep	United
24 Sep - 01 Oct	WestJet
19 Sep - 27 Sep	United
21 Sep - 28 Sep	Air Transat	direct
21 Sep - 05 Oct	Air Transat	direct
28 Sep - 05 Oct	Air Transat	direct
21 Sep - 22 Sep	Air Transat
22 Sep - 29 Sep	WestJet
26 Sep - 03 Oct	United
25 Sep - 02 Oct	United
29 Sep - 06 Oct	United
23 Sep - 30 Sep	WestJet
30 Sep - 07 Oct	WestJet

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 249€

Return flights