AirHint found the following cheapest return flights from Detroit (DTW) to San Juan (SJU) in May 2026 (see full year).

Return flights

26 May - 17 Jun	Delta	direct
14 May - 18 May	Southwest Airlines
07 May - 10 May	Southwest Airlines
07 May - 12 May	Southwest Airlines
05 May - 05 Jun	Southwest Airlines
07 May - 12 May	Delta	direct
02 May - 12 May	Delta	direct
05 May - 05 Jun	Delta	direct
07 May - 10 May	Delta	direct
21 May - 25 May	Southwest Airlines
23 May - 26 May	United
14 May - 18 May	Delta	direct
23 May - 26 May	Delta	direct

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

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 Detroit to San Juan in May from 319€

Return flights