Delta Adds Seattle Flights with New Philadelphia Route and Increased West Coast Frequencies

by Anthony Losanno
Delta A321

Advertiser & Editorial Disclosure: The Bulkhead Seat earns an affiliate commission for anyone approved through the links below. This compensation may impact how and where links appear on this site. We work to provide the best publicly available offers to our readers. We frequently update them, but this site does not include all available offers. Opinions, reviews, analyses & recommendations are the author’s alone, and have not been reviewed, endorsed, or approved by any of these entities.

Delta Air Lines is set to continue to expand at Seattle-Tacoma International Airport (SEA) next spring. Beginning May 7th, the airline will launch a new route and increase flight frequencies across several key California markets, reinforcing Seattle’s position as one of Delta’s most important West Coast gateways.

Daily, nonstop flights between Seattle-Tacoma International Airport (SEA) and Philadelphia International Airport (PHL) will be operated using the Airbus A321neo when it starts in May. The addition of Philadelphia broadens Delta’s transcontinental reach and adds competitive depth to a market currently served nonstop by American Airlines and Alaska Airlines. American and Alaska have hubs in these two cities, respectively.

Alongside the Philadelphia International Airport (PHL) addition, Delta will begin its fourth daily Seattle-Tacoma International Airport (SEA) to Boston Logan International Airport (BOS) flight. Its launch is being bumped up from June to May 7th. The schedule adjustment aims to meet strong seasonal demand for transcontinental travel between the two tech and business hubs.

Delta will also bolster service by adding more flights from Seattle-Tacoma International Airport (SEA) to two high-traffic California destinations. These include:

  • Ontario International Airport (ONT): increasing to 4x daily flights
  • San José Mineta International Airport (SJC): increasing to 5x daily flights

These additions reflect Delta’s ongoing strategy to expand connectivity between major West Coast cities and its Seattle hub to provide greater flexibility and frequency for business travelers.

Seattle-Tacoma International Airport (SEA) continues to play a pivotal role in Delta’s broader network strategy. The airline has steadily expanded operations at the airport over the past decade and positioned it as a key transpacific and transcontinental gateway. With this latest growth, Delta strengthens its domestic footprint while maintaining seamless connections to international destinations in Asia and beyond.

Anthony’s Take: Delta has made major strides in taking on Alaska Airlines at Seattle-Tacoma International Airport (SEA). These latest additions only further its position there. It will be interesting to see how the Philadelphia route performs up against both Alaska and American.

(H/T: AirlineGeeks.)

User Generated Content Disclosure: The Bulkhead Seat encourages constructive discussions, comments, and questions. Responses are not provided by or commissioned by any bank advertisers. These responses have not been reviewed, approved, or endorsed by the bank advertiser. It is not the responsibility of the bank advertiser to respond to comments.

Advertiser & Editorial Disclosure: The Bulkhead Seat earns an affiliate commission for anyone approved through the links above This compensation may impact how and where links appear on this site. We work to provide the best publicly available offers to our readers. We frequently update them, but this site does not include all available offers. Opinions, reviews, analyses & recommendations are the author’s alone, and have not been reviewed, endorsed, or approved by any of these entities.

1 comment

Scott October 18, 2025 - 12:30 am

an over crowded airport gets more crowded

Reply

Leave a Comment

Related Articles