Cheapest return flights from Houston to Porto in May from $599

AirHint found the following cheapest return flights from Houston (IAH) to Porto (OPO) in May 2026 (see full year).

Return flights

04 May - 11 May Air France
06 May - 13 May British Airways
05 May - 12 May Air France
02 May - 09 May British Airways
11 May - 18 May British Airways
12 May - 19 May British Airways
07 May - 14 May British Airways
03 May - 10 May British Airways
08 May - 15 May Frontier Airlines
14 May - 21 May British Airways
27 May - 03 Jun Frontier Airlines
28 May - 05 Jun Spirit Airlines
29 May - 05 Jun Frontier Airlines
28 May - 04 Jun Spirit Airlines
25 May - 01 Jun Frontier Airlines
26 May - 02 Jun Spirit Airlines
31 May - 07 Jun Spirit Airlines
30 May - 06 Jun Spirit Airlines

Also check the deals for one-way flights from Houston to Porto in May.

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