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

Return flights

29 Sep - 12 Oct	Copa
23 Sep - 14 Oct	Copa
26 Sep - 03 Oct	Copa
25 Sep - 02 Oct	Air Transat
29 Sep - 06 Oct	WestJet
18 Sep - 22 Sep	Avianca
21 Sep - 30 Sep	Avianca
27 Sep - 04 Oct	Copa
24 Sep - 01 Oct	Copa
28 Sep - 05 Oct	WestJet
22 Sep - 29 Sep	Copa
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd
21 Sep - 29 Sep	Avianca
21 Sep - 28 Sep	Avianca
18 Sep - 25 Sep	Copa
20 Sep - 27 Sep	Air Transat
23 Sep - 28 Sep	Copa
19 Sep - 26 Sep	WestJet

Also check the deals for one-way flights from Montreal to Cartagena 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 Cartagena in September from $407

Return flights