AirHint found the following cheapest return flights from Montreal (YUL) to San Juan (SJU) in August 2026 (see full year).

Return flights

19 Aug - 26 Aug	WestJet
25 Aug - 01 Sep	WestJet
26 Aug - 02 Sep	WestJet
05 Aug - 12 Aug	WestJet
15 Aug - 22 Aug	WestJet
21 Aug - 28 Aug	WestJet
04 Aug - 11 Aug	WestJet
06 Aug - 13 Aug	WestJet
14 Aug - 21 Aug	WestJet
18 Aug - 25 Aug	WestJet
22 Aug - 29 Aug	WestJet
28 Aug - 04 Sep	WestJet
12 Aug - 19 Aug	Arajet
27 Aug - 03 Sep	WestJet
30 Aug - 06 Sep	WestJet
31 Aug - 07 Sep	WestJet

Also check the deals for one-way flights from Montreal to San Juan in August.

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 San Juan in August from $579

Return flights