Cheapest return flights from Chicago to Porto in May from 580€

Best time to book flights for Chicago (ORD) to Porto (OPO) flights at AirHint

AirHint found the following cheapest return flights from Chicago (ORD) to Porto (OPO) in May 2025 (see full year).

Return flights

10 May - 17 May TAP
03 May - 10 May TAP
13 May - 20 May Spirit Airlines
05 May - 12 May Turkish Airlines
06 May - 13 May Turkish Airlines
04 May - 11 May TAP
07 May - 14 May TAP
16 May - 23 May TAP
01 May - 08 May Turkish Airlines
14 May - 21 May Air Canada
27 May - 03 Jun United
28 May - 04 Jun United
26 May - 02 Jun British Airways
31 May - 07 Jun Spirit Airlines
29 May - 04 Jun United

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

Skyscanner

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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