AirHint found the following cheapest return flights from Detroit (DTW) to San Juan (SJU) in September 2026 (see full year).
Return flights
| 04 Sep - 11 Sep | Southwest Airlines | ||
| 03 Sep - 11 Sep | Southwest Airlines | ||
| 05 Sep - 12 Sep | Southwest Airlines | ||
| 05 Sep - 12 Sep | Delta | direct |
Also check the deals for one-way flights from Detroit to San Juan in September.
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