Cheapest return flights from Denver to San Juan in May from $288

Best time to book flights for Denver (DEN) to San Juan (SJU) flights at AirHint

AirHint found the following cheapest return flights from Denver (DEN) to San Juan (SJU) in May 2025 (see full year).

Return flights

09 May - 11 May Frontier Airlines
06 May - 10 May Frontier Airlines
10 May - 13 May Frontier Airlines
09 May - 13 May Frontier Airlines
10 May - 17 May Frontier Airlines
17 May - 24 May Frontier Airlines
07 May - 13 May Frontier Airlines
16 May - 23 May Frontier Airlines
31 May - 05 Jun Frontier Airlines
15 May - 18 May Frontier Airlines
15 May - 19 May Frontier Airlines
31 May - 04 Jun Frontier Airlines

Also check the deals for one-way flights from Denver to San Juan in May.

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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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