Cheapest return flights from Chicago to Lisbon in September from 474€

AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in September 2025 (see full year).

Return flights

10 Sep - 18 Sep Icelandair
15 Sep - 18 Sep Spirit Airlines
08 Sep - 18 Sep TAP direct
16 Sep - 25 Sep British Airways
15 Sep - 24 Sep Finnair
09 Sep - 23 Sep Aer Lingus
04 Sep - 10 Sep Spirit Airlines
14 Sep - 18 Sep Aer Lingus
15 Sep - 25 Sep Iberia
14 Sep - 25 Sep United
24 Sep - 15 Oct Spirit Airlines
29 Sep - 05 Oct Turkish Airlines
28 Sep - 10 Oct KLM
27 Sep - 04 Oct TAP direct
29 Sep - 05 Oct TAP direct

Also check the deals for one-way flights from Chicago to Lisbon in September.

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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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