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

Return flights

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

Also check the deals for one-way flights from Montreal to Philipsburg 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 Philipsburg in September from $509

Return flights