AirHint found the following cheapest return flights from Houston (HOU) to Porto (OPO) in April 2026 (see full year).
Return flights
| 20 Apr - 27 Apr | KLM | ||
| 29 Apr - 06 May | KLM | ||
| 02 Apr - 09 Apr | KLM | ||
| 03 Apr - 10 Apr | KLM | ||
| 05 Apr - 12 Apr | KLM | ||
| 04 Apr - 11 Apr | Turkish Airlines |
Also check the deals for one-way flights from Houston to Porto in April.
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