Southwest AirlinesWN
Flights WN4840 07:55 We
live
Direct flights from Dallas (DAL) to Seattle (BFI): 1 nonstop departure observed each week across 1 airline. The nonstop covers 2,688 km, an estimated 3 hours 57 minutes in the air. Measured by Pro Flight Search from live flight boards at Dallas and Seattle. Updated 29 October 2026 at 09:54 UTC.
DAL
Dallas
smooth · +6
BFI
Seattle
tracking
2,688 km · ~3h 57m est.
Running clean · 1 airline · 1x weekly · nonstop
90 / 100
route health from live DAL and BFI delay boards
Flight time~3h 57mestimated from route distance
Weekly departures1x1 direct airline on the leg
The week
scheduled departures · origin local time06121824
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Southwest Airlines
Each mark is a scheduled departure at its origin-local time, observed operating in the last 7 days. Today is highlighted.
Who flies it
observed on the boards · 7 daysAirports right now
live boardsnext sweep in 120s
How the Dallas to Seattle route actually runs
Pro Flight Search records official board updates for nonstop DAL to BFI flights through the day: schedules, estimates, gate pushes and actual departures. The verdict above comes from operated flights, so it reflects what this route does rather than what the timetable promises.
Planning around a delay? Live airport delays · Weather delay risk map · Will a delayed flight be cancelled? · Do planes make up time in the air? · How we measure
Cite this data
Journalists, bloggers, and researchers may cite this page with attribution and a link to Pro Flight Search.
Suggested citation
Pro Flight Search: Dallas (DAL) to Seattle (BFI) route reliability, measured from operated flights on official airport boards.
Canonical URL
How we measure this →
https://proflightsearch.com/search-flights/DAL-BFI
DAL to BFI questions
Is DAL–BFI running on time right now?
Smooth skies ahead. The departure side at DAL is the weaker end, route health score 90/100. The airports section above carries the live status and delay window at both ends.
How long is the flight from DAL to BFI?
Great-circle distance is 2,688 km. With typical jet cruise speed plus taxi, climb and descent, expect roughly 220–260 min gate-to-gate on this route.
How often does DAL–BFI fly?
Southwest Airlines runs the route with about 1 flight a week (wed). Since one carrier owns the route, a single disruption tends to ripple through the day.
What does the route health score measure?
A blend of departure-side delay at DAL and arrival-side delay at BFI, computed from rolling delay windows (refreshed every 40 minutes) with a daily-rollup fallback. Current MVFR, IFR, or LIFR endpoint weather caps the score when flight rules can limit throughput. Higher is healthier: 100 means operations are clean at both ends.
.