Icelandair will launch seasonal nonstop service between Keflavik International Airport (KEF), near Reykjavik, and St. Louis Lambert International Airport (STL) on May 14, 2027, with the route running through October 24, 2027 Travel Radar.
Flights will operate four times per week on Mondays, Wednesdays, Fridays and Saturdays, using Boeing 737 MAX 8 aircraft configured with 16 Saga Premium seats and 144 economy seats, for a total of 160 seats per departure Simple Flying.
St. Louis becomes Icelandair's 16th U.S. destination. The route expands the airline's codeshare and connecting partnership with Southwest Airlines to cover STL — Southwest is the largest carrier at the airport. Passengers can connect through Keflavik to more than 35 European destinations Travel Radar.
The announcement, made October 7, 2026, follows Icelandair's broader fleet renewal strategy combining Boeing 737 MAX 8 and Airbus A321LR aircraft. The 737 MAX 8 operates STL–KEF with a range well suited to the North Atlantic sector. St. Louis Lambert serves approximately 15.6 million passengers annually and gains a notable new international link Travel Radar.
Sources
- Travel Radar – Icelandair Adds St. Louis Routes and Expands Partnership
- Simple Flying – Icelandair Will Fly A 160-Seat Boeing 737 MAX 8 From St. Louis To Reykjavik With Southwest Airlines Connections
- Global Traveler – Icelandair Launches Non-Stop St. Louis Service to Reykjavik
Sources & references (3)
Things to do at each end of the route
Top-rated tours & experiences in Reykjavík and St Louis.