Icelandair Unveils New US Nonstop Route To This Southwest Airlines City: See Map Now

Published Oct 8, 2026, 10:43 AM EDT Prachi is a London-based journalist with extensive experience in the aviation industry. She has worked for several leading industry publications, covering a broad range of topics. Her expertise lies in aircraft maintenance, emerging technologies, and advanced air mobility. She is currently pursuing a PhD in Journalism, focusing on data journalism and its potential to transform conventional aviation reporting. Icelandair has been flying to the United States for decades. The airline has expanded its US network over the years and has continued to add new destinations in recent years. It has now added another destination: St. Louis Lambert International Airport (STL), which is one of the major US cities served by its partner Southwest Airlines. The addition will give St. Louis another international connection. Icelandair will become the third international airline at the airport. The new route comes as the Icelandic carrier continues to adjust its North American network. Icelandair Will Add Four Weekly Flights To St. Louis Credit: Kevin Hackert | Shutterstock Starting May 14, 2027, Icelandair will operate four weekly seasonal flights from Keflavik International Airport (KEF) near Reykjavík to St. Louis. The flights will operate every Monday, Wednesday, Friday, and Sunday through October 24, 2027. The carrier will use a Boeing 737 MAX 8 on the route, featuring 16 business class recliner seats and 144 economy class seats. This is not the first time St. Louis will have a direct connection to Reykjavík. The now-defunct low-cost carrier WOW Air operated flights between the two cities in 2018 and 2019. The airline later exited the market amid broader problems. With the latest addition, the airport will have three European connections. British Airways started daily flights between St. Louis and London in April. Lufthansa also offers five weekly flights to Germany from the Midwestern city. Loading map… Drag to explore Icelandair Will Serve 15 US Gateways Next Summer Credit: Robert Buchel | Shutterstock Icelandair has gradually expanded its US network in recent years. Indeed, its partnership with Southwest Airlines has supported this expansion. In October last year, the airline started three weekly seasonal flights to Miami International Airport (MIA) using its Airbus A321LR. Earlier in April 2025, it launched flights to Nashville International Airport (BNA). A year earlier, the airline also started a seasonal route to Pittsburgh International Airport (PIT). Following the commencement of the St. Louis service, Icelandair will connect Iceland to 15 US gateways. For the upcoming summer season, according to scheduled data from aviation analytics provider Cirium, the airline has scheduled more than 500 departures to the US in a single month, offering more than 97,000 one-way seats. Icelandair has made multiple changes to its schedule. Destination Frequency* Seattle (SEA) 2 to 3x daily Frequency reduced from 20 to 16 weekly for NS27 Boston (BOS) 2x daily New York JFK (JFK) 2x daily Chicago O'Hare (ORD) 2x daily; Frequency increased from 13 to 14x weekly for NS27 Denver (DEN) 1 to 2x daily; Frequency reduced from 14 to 12x weekly for NS27 Baltimore (BWI) 1 to 2x daily Washington Dulles (IAD) 1 to 2x daily Newark Liberty (EWR) 1x daily Minneapolis (MSP) 1x daily Raleigh/Durham (RDU) 1x daily Orlando (MCO) 6x weekly (Tue, Wed, Thu, Fri, Sat, Sun); Frequency increased from five to six weekly for NS27 Portland (PDX) 5x weekly (Mon, Wed, Thu, Fri, Sun); Frequency reduced from six to five weekly for NS27 Pittsburgh (PIT) 4x weekly (Tue, Thu, Sat, Sun) Nashville (BNA) 4x weekly (Mon, Wed, Fri, Sun) St. Louis (STL) 4x weekly (Mon, Wed, Fri, Sun) *Frequency is based on the July 2027 schedule; it is subject to change The carrier is increasing its Chicago O'Hare service from 13 to 14 weekly flights, and Orlando service from five to six weekly. It is also reducing frequencies on its Seattle and Denver routes, as noted in the table embedded above. Overall, the airline has seen growth in its US passenger numbers. Between 1991 and 2025, it carried 21.1 million passengers to and from the US. Its best year to date was 2025, when it carried more than 1.6 million passengers. Icelandair Has Cut Two North American Routes This Year Credit: Pavel1964 | Shutterstock Furthermore, the St. Louis addition comes as Icelandair has also exited some markets in North America. Earlier this year, the airline ended its seasonal service to Detroit Metropolitan Wayne County Airport (DTW). Icelandair started the route in 2023, but the route did not perform particularly strongly on loads. Data from the US Department of Transportation shows that it was Icelandair's second-weakest route in 2024 by load factor, at around 79%. The airline carried about 42,000 passengers on the route that year. In addition, the Icelandic carrier is dropping Halifax / Stanfield International Airport (YHZ) from its schedule for next summer. It is scheduled to operate its final flight to the airport on October 18, 2026. This will end the only scheduled nonstop connection between Iceland and Atlantic Canada. Halifax was Icelandair's shortest route to Canada or the US, covering around 1,785 nautical miles (3,306 km) each way. The airline reinstated flights to Halifax in 2024 only, but over the years, the route saw its frequency reduced. Last year during peak summer, Icelandair operated three weekly flights, compared with two weekly flights during the same period this year. Seats available for sale also fell from 18,880 in 2024 to 13,120 in 2025 and 12,800 in 2026.