AirHint found the following cheapest return flights from Chicago (MDW) to Keflavik (KEF) in January 2026 (see full year).
Return flights
| 12 Jan - 16 Jan | Frontier Airlines | ||
| 13 Jan - 18 Jan | Frontier Airlines | ||
| 08 Jan - 15 Jan | Southwest Airlines | ||
| 29 Jan - 09 Feb | Southwest Airlines | ||
| 09 Jan - 13 Jan | Southwest Airlines |
Also check the deals for one-way flights from Chicago to Keflavik in January.
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