Alaska Airlines has finally managed to secure the necessary slots at London Heathrow Airport to enable it to launch its new route from Seattle-Tacoma International Airport. Scheduled to start in the spring, the nonstop service will be flown using a 300-seat Boeing 787-9 in a three-class layout.

Slots at Heathrow are notoriously hard to come by, and Alaska Airlines had failed in its first attempt to acquire them from the slot coordinator last month. Undaunted, it has now signed an agreement to lease daily slot pairs from American Airlines, allowing it to begin its new SEA-LHR service from May 2026.

The Struggle To Get LHR Slots

Credit: Alaska Airlines

Alaska Airlines first declared its intention to initiate a new daily SEA-LHR service back in August. This would be Alaska’s fourth intercontinental route, following announcements earlier in the year that it was launching routes from Seattle to Tokyo, Seoul, and Rome (starting in spring of 2026). At the time, there was much discussion about how Alaska Airlines would acquire the necessary slots at Heathrow, with some speculating that oneworld partner, British Airways, could hand off one of its twice-daily SEA-LHR flights.

But British Airways enjoys 90%+ load factors on the route using premium-dense aircraft, so partner or not, it’s in no hurry to give up one of its daily flights to Alaska Airlines. So the Seattle-based carrier went the traditional route of applying for new slots with Airport Coordination Limited (ACL), the independent company that manages the slots at Heathrow and 77 other global airports.

The application didn’t go well. When ACL published its initial coordination report for Heathrow’s summer 2026 season, Alaska Airlines was one of the many airlines that failed to obtain new slots at the airport. Its only alternative option was to turn to airlines that already have slots, and take the much more costly path of negotiating the lease of a slot pair. This is what it has now done.

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American Airlines Agrees To A Slot Lease

Credit: Alaska Airlines

American Airlines is the third-largest slot holder at Heathrow, behind only British Airways and Virgin Atlantic. But Cirium data indicates that the carrier has scheduled one fewer daily departures from the US to Heathrow in the summer of 2026 compared to this year, cutting a daily flight from Miami International Airport starting May 22, 2026.

Earlier today, ACL published a slot lease update, indicating that Alaska Airlines has leased 14 slots (equating to a daily arrival and departure) from American Airlines, not coincidentally starting on May 22 as well. As it stands, the new Alaska Airlines flight to Heathrow is set to arrive at 2:05 pm UTC and depart at 4:00 pm UTC, although that is likely to change as it would be an impossible turnaround for an international flight.

Interestingly, the lease is only set to run for the summer, ending on October 24, and there are no indications what Alaska Airlines’ plans are after that for what is billed as a daily, year-round service. Nevertheless, the airline is buoyant about the launch of the new route, emphasizing the importance of its partnerships in bringing it together:

“Alaska’s expansion into the London market, facilitated by strengthened collaborations with American Airlines and British Airways, presents significant opportunities. These alliances are expected to deepen over time, offering even greater value and connectivity to consumers.”

What The Service Will Look Like

Credit: Alaska Airlines

Alaska Airlines plans to utilize its 787-9s on the new route, which will be configured with a total of 300 seats as follows:

• Business Class: 34 Adient Ascent suites arranged in a 1-2-1 configuration. Each seat will convert into a full flat bed, with each suite having privacy doors, direct aisle access, large 4K entertainment screens, and adjustable privacy partitions in the center section.
• Extra-Legroom Seats: 79 seats in a 3-3-3 configuration. While not a true Premium Economy class, the seats in the middle cabin will have extra legroom, larger screen, more recline and extra service compared to the main cabin:
• Main Cabin: 187 seats in a 3-3-3 configuration, with each seat having a seatback screen, Bluetooth pairing, and complimentary meals and beverages on each flight.

Alaska Airlines has also indicated that it plans to emphasize its soft product as a differentiator on what will undoubtedly be a highly competitive route once it grows to five daily flights. It plans two complimentary chef-inspired meals, leaning into the cuisine of the Pacific Northwest, along with complimentary beer and wine. Passengers in the premium cabins will be provided Filson blankets, bedding and amenity kits stocked with specialist skincare products. The airline also plans to offer high-speed internet from Starlink, free for Atmos Rewards members, from late 2026.