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

Return flights

04 Sep - 15 Sep	United
13 Sep - 20 Sep	United
19 Sep - 26 Sep	United
23 Sep - 30 Sep	United
25 Sep - 02 Oct	United
27 Sep - 04 Oct	United
29 Sep - 06 Oct	United
04 Sep - 11 Sep	United
03 Sep - 10 Sep	United
10 Sep - 17 Sep	United
28 Sep - 05 Oct	Air Canada
08 Sep - 15 Sep	United
09 Sep - 16 Sep	United
26 Sep - 03 Oct	United
30 Sep - 07 Oct	United
21 Sep - 28 Sep	Air Transat	direct

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 324€

Return flights