AirHint found the following cheapest return flights from St. Louis (STL) to Keflavik (KEF) in August 2026 (see full year).
Return flights
| 22 Aug - 01 Sep | Air Canada | ||
| 16 Aug - 23 Aug | Air Canada | ||
| 23 Aug - 31 Aug | Lufthansa | ||
| 22 Aug - 31 Aug | Air Canada | ||
| 20 Aug - 30 Aug | Air Canada | ||
| 08 Aug - 17 Aug | Lufthansa |
Also check the deals for one-way flights from St. Louis to Keflavik in August.
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