AirHint found the following cheapest return flights from Houston (HOU) to Porto (OPO) in September 2026 (see full year).
Return flights
| 17 Sep - 24 Sep | Delta | ||
| 16 Sep - 23 Sep | British Airways | ||
| 03 Sep - 10 Sep | Turkish Airlines | ||
| 04 Sep - 11 Sep | Turkish Airlines | ||
| 11 Sep - 26 Sep | British Airways |
Also check the deals for one-way flights from Houston to Porto in September.
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