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

Return flights

01 Sep - 15 Oct	Avianca
24 Sep - 17 Oct	Avianca
24 Sep - 24 Oct	Avianca
01 Sep - 08 Oct	Avianca
15 Sep - 17 Oct	Avianca
15 Sep - 06 Oct	Avianca
01 Sep - 06 Oct	Avianca
24 Sep - 06 Oct	Avianca
29 Sep - 08 Oct	Avianca
21 Sep - 29 Sep	Avianca
17 Sep - 26 Sep	Avianca
22 Sep - 29 Sep	Avianca
19 Sep - 26 Sep	Avianca
26 Sep - 29 Sep	Avianca
24 Sep - 01 Oct	Copa
08 Sep - 15 Sep	Avianca
15 Sep - 22 Sep	Avianca
01 Sep - 24 Sep	Avianca
15 Sep - 24 Sep	Avianca
16 Sep - 23 Sep	Copa

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 $351

Return flights