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
17 Sep - 24 Sep	Avianca
29 Sep - 06 Oct	Avianca
29 Sep - 08 Oct	Avianca
26 Sep - 03 Oct	Avianca
10 Sep - 17 Sep	Avianca
15 Sep - 22 Sep	Avianca
22 Sep - 29 Sep	Avianca
11 Sep - 18 Sep	Copa
03 Sep - 10 Sep	Avianca
07 Sep - 19 Sep	Avianca
08 Sep - 15 Sep	Avianca
21 Sep - 28 Sep	Avianca
07 Sep - 14 Sep	Avianca
24 Sep - 01 Oct	Avianca
25 Sep - 02 Oct	Copa
28 Sep - 05 Oct	Copa
30 Sep - 07 Oct	WestJet

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 266€

Return flights