In recent times, Alaska Airlines has emerged as an unlikely player in the long-haul game, with a particular focus on routes to Asia and Europe from its main US West Coast hub at Seattle-Tacoma International Airport (SEA). Additionally, its merger with Hawaiian Airlines has seen it inherit some of the latter’s longest routes as well, which has resulted in its overall intercontinental route network taking a rather different form compared to before.

According to present scheduling data made available by Cirium, an aviation analytics company, Alaska’s longest route by scheduled block time between May and December of 2026 clocks in at a duration of almost 12 hours.

Alaska’s Longest Route: Seattle-Seoul

Credit: Alaska Airlines

Passengers looking to sample Alaska’s longest route by block time should look no further than its transpacific corridor between Seattle and Incheon International Airport (ICN) in Seoul, South Korea. The westbound rotation is the longer of the two legs on this route, with a maximum scheduled block time of 11 hours and 55 minutes. Alaska operates the route with the Boeing 787-9 Dreamliner.

The oneworld member operates a near-daily frequency on this route, with 27 departures apiece in May, July, and August, 25 in June and September, 23 in October, 22 in December, and 21 in November. Between May and December, these combined frequencies amount to a grand total of 197 flights, with these services collectively offering 59,100 seats and 308,324,700 available seat miles. The carrier’s CCO, Andrew Harrison, commented on expanding its global reach in 2025.

“As we grow our global network from Seattle in the coming years, we’ll announce new international routes to dynamic destinations that we know our guests are going to love to visit.”

Rounding Out The Top Five

Credit: Alaska Airlines

Alaska’s second-longest route by block time is also operated by the 787-9. However, rather than linking Seattle with another Asian city, its destination is in Europe, and namely comes in the form of Rome Fiumicino Airport (FCO). Launched last month, the return leg on this route back to Seattle tops out at 11 hours and 25 minutes. It will be served daily throughout the summer, with the last rotation returning on October 21.

Third and fourth place on this list are occupied by routes that Alaska inherited through its merger with Hawaiian. Rounding out the podium in third place, despite its duration, is actually a domestic flight, namely from New York-JFK back to Honolulu (HNL) in Hawaii. This takes 11 hours and 15 minutes, operated by the Airbus A330-200, and is marginally longer than the fourth-placed 11-hour route from Honolulu to Sydney Kingsford Smith Airport (SYD).

The last entry in the top five is another transpacific corridor that originates in Seattle, with its destination being Tokyo Narita Airport (NRT) in Japan. Flying westbound, passengers can expect a maximum block time of 10 hours and 40 minutes, with these daily flights switching from the A330 to the 787 in October.

The Best Of The Rest

Credit: Great Circle Map

Returning to Europe, Alaska Airlines’ sixth-longest route by scheduled block time links Seattle with London. Launching later this month, the return leg takes a maximum of 10 hours and five minutes. This puts it just ahead of the inherited ex-Hawaiian route from Honolulu to Osaka, which tops out at 10 hours. Elsewhere in Japan, Honolulu to Tokyo Haneda Airport (HND) ranks eighth, at nine hours and 20 minutes.

Ninth place is occupied by another ex-Hawaiian route, with the westbound leg of the corridor from Honolulu to Auckland in New Zealand taking up to nine hours and 10 minutes. Once again, the A330-200 is the aircraft of choice on these flights. Meanwhile, the 10th spot features Alaska’s longest narrowbody route, with the 737 MAX 8 taking seven hours and 57 minutes to link New York-JFK with Ted Stevens Anchorage International Airport (ANC).