AirHint found the following cheapest return flights from Houston (IAH) to Porto (OPO) in April 2026 (see full year).
Return flights
| 27 Apr - 04 May | Air France | ||
| 28 Apr - 05 May | Air France | ||
| 30 Apr - 07 May | British Airways | ||
| 12 Apr - 19 Apr | British Airways | ||
| 17 Apr - 21 Apr | British Airways |
Also check the deals for one-way flights from Houston to Porto in April.
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