AirHint found the following cheapest return flights from Detroit (DTW) to Porto (OPO) in May 2026 (see full year).
Return flights
| 11 May - 18 May | jetBlue | ||
| 13 May - 20 May | Turkish Airlines | ||
| 01 May - 08 May | Turkish Airlines | ||
| 12 May - 19 May | Spirit Airlines | ||
| 02 May - 09 May | Delta | ||
| 03 May - 10 May | Spirit Airlines |
Also check the deals for one-way flights from Detroit to Porto in May.
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