Delta’s Optimistic Seattle To London Heathrow Expansion

Delta Air Lines plans to expand its presence between Seattle and London this coming winter, as flagged by @IshrionA. I suspect this is intended as a preemptive move given Alaska Airlines’ long haul expansion, but I can’t help but think the airline is being a bit too aggressive…

Delta grows Seattle to London market in winter

For the upcoming 2025-2026 IATA winter season, Delta plans to operate daily flights between Seattle (SEA) and London (LHR), representing a bit of a strategy shift. For context, this past winter, Delta operated in the market 3x weekly.

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What’s going on here is that this past winter, Delta launched a seasonal 4x weekly London to Orlando flight, and those Heathrow slots came from the Seattle service, which was reduced from 7x weekly to 3x weekly at the time. So that route won’t be making a comeback next winter, and instead, Delta will move those 4x weekly slots back to Seattle, so that it can resume daily flights.

Here’s what makes this even more interesting, though. The 4,801-mile flight is also operated daily by Virgin Atlantic, so the Delta and Virgin Atlantic joint venture will have 2x daily flights in the market.

I don’t see this level of winter capacity lasting

We’ll see how this plays out, but I’m just going to go ahead and put in my guess that the 14x weekly flights between Seattle and London on Delta and Virgin Atlantic won’t last for the winter season, and that there will be cuts. I don’t think anyone thinks that demand across the Atlantic will be stronger this upcoming winter than it has been in past winters, given the current global situation.

For what it’s worth, British Airways operates 10x weekly flights in the market in winter, and has a material competitive advantage over Delta:

• It partners with Alaska, which has more connectivity in Seattle than Delta does
• It has a massive regional and global connecting network in London, much bigger than with Virgin Atlantic; that’s especially important in winter, where transatlantic demand just isn’t as high

We know that Alaska is launching long haul flights out of Seattle. The airline will first fly to Tokyo Narita and Seoul Incheon, but plans to expand to Europe in 2026. I can’t help but think that Delta beefing up in the Seattle to London market is partly a competitive response to that, though I’m not sure what exactly it’s going to accomplish. It’s going to be interesting to see how the “battle in Seattle” evolves.

Figuring out where to fly planes in winter can be complicated. However, what Delta’s doing here just doesn’t feel like a winning strategy. The airline reduced Seattle flights to launch Orlando flights. Then the airline canceled Orlando flights to boost Seattle flights. And now the airline plans to grow in Seattle again, across the Atlantic in winter.

Bottom line

This upcoming winter, Delta will cancel its Orlando to London flight, and instead boost its Seattle to London service. Between Delta and Virgin Atlantic, the airlines are planning to operate 14x weekly flights in the market. That’s more service than is offered by British Airways, which has a much stronger market position.

I find this level of service to be a bit of a head scratcher, and if I were a betting man, I’d guess we’ll see some frequency cuts…

What do you make of Delta’s Seattle to London winter expansion? Do you think it will last?