Alaska Airlines Launched Seattle to Keflavík Flight Route

The carrier began nonstop seasonal service between Seattle and Iceland using Boeing 737 MAX 8 aircraft on May 28, 2026.

Updated on Oct. 5, 2026 in Air Travel

Bold vector editorial illustration of an abstract aircraft silhouette banking over rugged mountain peaks, representing new international flight connectivity. — Alaska Airlines began seasonal nonstop service between Seattle and Iceland on May 28, marking the longest route currently operated by a U.S. carrier using a 737. AI Illustration. Upload story photo >

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Alaska Airlines inaugurated a 3,611-mile nonstop flight route from Seattle-Tacoma International to Keflavík on May 28, 2026. This service represents the longest nonstop flight currently operated by a U.S. carrier using a 737 variant.

Why it matters

The route was established in response to a decline in traffic for Icelandair out of Reykjavík and saw increased demand surrounding the August 12, 2026, total solar eclipse. The service includes a codeshare agreement providing access to 35 European destinations.

The flight covers 3,611 miles with a duration just under eight hours, utilizing aircraft equipped with LED lighting to mitigate jet lag. The seasonal service has been extended through September 7, 2026.

The players

Alaska Airlines

This major American carrier is headquartered in SeaTac, Washington, and operates a significant hub at Seattle-Tacoma International Airport.

Icelandair

The flag carrier of Iceland maintains its primary hub at Keflavík International Airport and facilitates international connections.

Boeing

This multinational aerospace corporation designs and manufactures the 737 MAX 8 aircraft utilized for the new nonstop route.

The details

The service connects Pacific Northwest travelers to Iceland and beyond through a bilateral codeshare agreement. Boeing 737 MAX 8 jets facilitate the journey, which requires nearly eight hours of flight time.

May 28, 2026: Inaugural service launched between Seattle and Keflavík.
June 2026: Data collection period showing 8,320 passengers and 77.2% occupancy.
August 12, 2026: Travel demand spiked due to the total solar eclipse.
September 7, 2026: The seasonal flight service concluded for the year.
Summer 2027: Planned earlier start for the seasonal route.

Travel Outlook

This route follows the industry trend of using narrow-body aircraft for long-haul transatlantic routes by maximizing the range of the Boeing 737 MAX 8. The seasonal extension highlights how major astronomical events can shift typical tourism cycles.

Travelers should note that the seasonal service is scheduled to return in summer 2027 with an even earlier start date. Those looking for European connections should check the codeshare availability for onward travel from Iceland to 35 different destinations.

The takeaway

The successful implementation of this long-range route suggests narrow-body aircraft are becoming increasingly viable for transatlantic travel. Passengers should utilize the provided codeshare options to streamline connections across the European continent.