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Cheapest one-way flights from Chicago (ORD) to Porto (OPO), September

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Dates, airline, and price
Dates	Airline	Price
02 Sep	Icelandair
27 Sep	SWISS
29 Sep	Lufthansa
30 Sep	Lufthansa
09 Sep	Air Canada
26 Sep	Air Canada
28 Sep	Air Canada
25 Sep	Air Canada
03 Sep	Iberia
04 Sep	Iberia

deals for return flights from Chicago to Porto in September.

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Updated Jul 20, 2026.

About these fares

These results come from our latest search across airlines for your currency. Prices change quickly and are not locked until you complete booking—always confirm the total and fare rules on the partner site.

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Cheapest one-way flights from Chicago (ORD) to Porto (OPO), September

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