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

Return flights

06 Sep - 13 Sep	United
13 Sep - 20 Sep	United
20 Sep - 27 Sep	United
27 Sep - 04 Oct	United
29 Sep - 06 Oct	Avianca
08 Sep - 22 Sep	Avianca
24 Sep - 01 Oct	Avianca
05 Sep - 12 Sep	Avianca
15 Sep - 22 Sep	Avianca
07 Sep - 14 Sep	Avianca
21 Sep - 28 Sep	Avianca
08 Sep - 15 Sep	Avianca
17 Sep - 24 Sep	Avianca
28 Sep - 06 Oct	Avianca
29 Sep - 15 Oct	Avianca
29 Sep - 22 Oct	Avianca
29 Sep - 24 Oct	Avianca
28 Sep - 15 Oct	Avianca
26 Sep - 03 Oct	Avianca
29 Sep - 08 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 $307

Return flights