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Cheapest return flights from Denver (DEN) to San Juan (SJU), September

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Dates, airline, and price
Dates	Airline	Price
10 Sep 15 Sep	Frontier Airlines
09 Sep 14 Sep	Frontier Airlines
19 Sep 25 Sep	Frontier Airlines
19 Sep 26 Sep	Frontier Airlines
19 Sep 25 Sep	United Direct Flight
19 Sep 26 Sep	United Direct Flight

deals for one-way flights from Denver to San Juan in September.

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Updated May 28, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest return flights from Denver (DEN) to San Juan (SJU), September

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