Cheapest return flights from Washington to Porto in May from $653

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

Return flights

11 May - 18 May Delta
12 May - 19 May British Airways
13 May - 20 May jetBlue
16 May - 23 May British Airways
08 May - 15 May jetBlue
10 May - 17 May jetBlue
09 May - 16 May Delta
17 May - 24 May United
19 May - 26 May Iberia
14 May - 21 May jetBlue
25 May - 02 Jun British Airways

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

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