Seattle (SEA) to Dallas (DAL): On-Time Performance
Data through May 2026
Seattle (SEA) to Dallas (DAL) is a thinner route than most in this dataset — 216 departures over the past year, roughly 4 a week — so treat these numbers as indicative rather than definitive. Of the flights that did operate, 68% arrived on time, noticeably below the national average of 78%.
- On-time
- 68%
- arrived <15 min late
- Avg delay
- 17 min
- completed flights
- Cancelled
- 0.4%
- Flights/day
- 0.59
- last 12 months
- Duration
- 3h 56m
- scheduled
- Distance
- 1,670 mi
Best airline from SEA to DAL
2 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Alaska Airlinesmost reliable | 83% | 9 min | 0.6% | 312 |
| Southwest Airlines | 51% | 27 min | 0.0% | 259 |
Monthly on-time trend
Best time to fly from SEA to DAL
Aim for departures around 7 a.m. (86% on-time); avoid 2 p.m. departures (38%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 71% | 12 min |
| Tuesday | 73% | 13 min |
| Wednesdaybest | 75% | 16 min |
| Thursday | 66% | 16 min |
| Friday | 60% | 21 min |
| Saturday | 64% | 20 min |
| Sunday | 69% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft36%
- Airline operations34%
- National airspace system29%
- Weather1%
Frequently asked questions
- How often are flights from SEA to DAL delayed?
- 32% of SEA–DAL flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 17 minutes.
- Which airline is most reliable from SEA to DAL?
- Alaska Airlines has the best on-time record on this route at 83%, based on 312 flights. 2 airlines flew SEA–DAL frequently enough to compare in this period.
- What is the best time of day to fly from SEA to DAL?
- Departures around 7 a.m. have the best record (86% on-time), while departures around 2 p.m. have the worst (38%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to DAL?
- The scheduled SEA–DAL flight time averages 3h 56m over 1,670 miles. Actual arrival times vary — flights on this route land 15+ minutes late 32% of the time.
- How often are SEA to DAL flights cancelled?
- 0.4% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to DAL?
- July 2025 was the roughest month in this dataset, with only 31% of arrivals on time. The best was April 2025 at 92%. If your dates are flexible, that 60-point gap is worth planning around.
Explore related pages
More routes from SEA
Based on 571 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.