AirHint found the following cheapest return flights from Detroit (DTW) to Porto (OPO) in July 2026 (see full year).

Return flights

02 Jul - 09 Jul	Delta
01 Jul - 08 Jul	Delta
03 Jul - 10 Jul	Delta
01 Jul - 09 Jul	Delta
02 Jul - 10 Jul	Delta
05 Jul - 13 Jul	WestJet
04 Jul - 12 Jul	WestJet
03 Jul - 11 Jul	WestJet
04 Jul - 11 Jul	WestJet
05 Jul - 12 Jul	WestJet

Also check the deals for one-way flights from Detroit to Porto in July.

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 Porto in July from $794

Return flights