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

Return flights

27 Sep - 04 Oct	United
22 Sep - 29 Sep	Avianca
29 Sep - 08 Oct	Avianca
21 Sep - 30 Sep	Avianca
17 Sep - 24 Sep	Avianca
24 Sep - 06 Oct	Avianca
21 Sep - 28 Sep	Avianca
24 Sep - 01 Oct	Avianca
20 Sep - 27 Sep	United
19 Sep - 26 Sep	Avianca
29 Sep - 06 Oct	Avianca
30 Sep - 07 Oct	Porter Airlines (Canada) Ltd
19 Sep - 29 Sep	Avianca
23 Sep - 30 Sep	Copa
28 Sep - 06 Oct	Avianca
27 Sep - 06 Oct	Air Transat
26 Sep - 03 Oct	Air Canada
26 Sep - 06 Oct	Avianca

Also check the deals for one-way flights from Montreal to Willemstad 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 Willemstad in September from 325€

Return flights