Cheapest return flights from Chicago to Keflavik in October from 350€

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

Return flights

17 Oct - 21 Oct Frontier Airlines
10 Oct - 17 Oct Frontier Airlines
17 Oct - 24 Oct Frontier Airlines
11 Oct - 18 Oct Frontier Airlines
13 Oct - 17 Oct Frontier Airlines
13 Oct - 20 Oct Frontier Airlines
10 Oct - 14 Oct Frontier Airlines
12 Oct - 21 Oct Frontier Airlines
03 Oct - 10 Oct Frontier Airlines
16 Oct - 23 Oct Frontier Airlines
27 Oct - 03 Nov Southwest Airlines
30 Oct - 06 Nov Southwest Airlines
30 Oct - 03 Nov Southwest Airlines
25 Oct - 01 Nov Southwest Airlines
26 Oct - 02 Nov Frontier Airlines
29 Oct - 05 Nov Southwest Airlines
31 Oct - 07 Nov Southwest Airlines
28 Oct - 04 Nov Southwest Airlines
28 Oct - 05 Nov Southwest Airlines
26 Oct - 04 Nov Frontier Airlines

Also check the deals for one-way flights from Chicago to Keflavik 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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