Cheapest return flights from Chicago to Lisbon in May from 451€

AirHint found the following cheapest return flights from Chicago (ORD) to Lisbon (LIS) in May 2026 (see full year).

Return flights

05 May - 12 May Finnair
06 May - 13 May Air Canada
08 May - 15 May Iberia
11 May - 18 May KLM
01 May - 09 May Finnair
19 May - 26 May Air Canada
09 May - 16 May Iberia
09 May - 16 May TAP direct
10 May - 17 May Air Canada
08 May - 15 May TAP direct
28 May - 11 Jun Air Canada
29 May - 12 Jun Air Canada
31 May - 06 Jun Finnair
31 May - 07 Jun Air Canada
27 May - 03 Jun TAP
31 May - 07 Jun TAP direct

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

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