Cheapest return flights from Chicago to Porto in October from 407€

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

Return flights

28 Oct - 04 Nov KLM
29 Oct - 05 Nov Delta
27 Oct - 03 Nov KLM
14 Oct - 21 Oct KLM
30 Oct - 06 Nov Delta
31 Oct - 07 Nov Delta
26 Oct - 02 Nov KLM
15 Oct - 22 Oct Delta
21 Oct - 28 Oct Air France
22 Oct - 29 Oct KLM
20 Oct - 27 Oct KLM
23 Oct - 30 Oct KLM
07 Oct - 14 Oct KLM
24 Oct - 31 Oct Air France
16 Oct - 23 Oct KLM
02 Oct - 09 Oct Air France
25 Oct - 01 Nov KLM
15 Oct - 08 Nov KLM

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

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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