14 Weekly: Delta Air Lines Doubles Down On Seattle-London Heathrow Flights This Winter

Delta Air Liness is boosting its service between Seattle-Tacoma International Airport (SEA) and London Heathrow Airport (LHR) for the winter of 2025-2026. Starting October 25, 2025, the airline will increase its service to two daily flights on this high-demand route, up from the previously scheduled one daily flight during the winter 2024-2025 season..