AirHint found the following cheapest return flights from Phoenix (PHX) to Porto (OPO) in March 2026 (see full year).

Return flights

24 Mar - 31 Mar	Delta
16 Mar - 23 Mar	Air Canada
07 Mar - 14 Mar	Air Canada
17 Mar - 24 Mar	United
30 Mar - 06 Apr	Delta
27 Mar - 03 Apr	Delta
25 Mar - 01 Apr	United
23 Mar - 30 Mar	Delta
20 Mar - 27 Mar	Frontier Airlines
18 Mar - 25 Mar	Delta
22 Mar - 29 Mar	Frontier Airlines
21 Mar - 28 Mar	Frontier Airlines
29 Mar - 05 Apr	Air France
28 Mar - 04 Apr	British Airways
19 Mar - 26 Mar	Frontier Airlines
26 Mar - 02 Apr	Frontier Airlines

Also check the deals for one-way flights from Phoenix to Porto in March.

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 Phoenix to Porto in March from $467

Return flights