Las Vegas (LAS) to Seattle (SEA): On-Time Performance
Data through July 2026
When you fly LAS to SEA matters as much as anything else about the booking: the route swung from 93% on-time in February 2026 to just 68% in July 2024. Across the full period the route averages 81% on-time against a national 78%. Morning departures also hold up better than evening ones (88% vs 71%), which matters most in the rough months.
- On-time
- 81%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.8%
- Flights/day
- 15
- last 12 months
- Duration
- 2h 48m
- scheduled
- Distance
- 867 mi
Best airline from LAS to SEA
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 87% | 11 min | 0.7% | 3,627 |
| Frontier Airlines | 82% | 11 min | 1.5% | 524 |
| Alaska Airlines | 80% | 14 min | 1.0% | 5,620 |
| Spirit Airlines | 78% | 14 min | 1.0% | 695 |
| Southwest Airlines | 72% | 14 min | 0.3% | 2,045 |
Monthly on-time trend
Best time to fly from LAS to SEA
Aim for departures around 6 a.m. (94% on-time); avoid 10 p.m. departures (60%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 11 min |
| Tuesday | 86% | 10 min |
| Wednesdaybest | 86% | 9 min |
| Thursday | 77% | 14 min |
| Friday | 74% | 18 min |
| Saturday | 84% | 11 min |
| Sunday | 77% | 14 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations34%
- National airspace system19%
- Weather3%
Frequently asked questions
- How often are flights from LAS to SEA delayed?
- 20% of LAS–SEA flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 13 minutes.
- Which airline is most reliable from LAS to SEA?
- Delta Air Lines has the best on-time record on this route at 87%, based on 3,627 flights. 5 airlines flew LAS–SEA frequently enough to compare in this period.
- What is the best time of day to fly from LAS to SEA?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 10 p.m. have the worst (60%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from LAS to SEA?
- The scheduled LAS–SEA flight time averages 2h 48m over 867 miles. Actual arrival times vary — flights on this route land 15+ minutes late 20% of the time.
- How often are LAS to SEA flights cancelled?
- 0.8% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from LAS to SEA?
- July 2024 was the roughest month in this dataset, with only 68% of arrivals on time. The best was February 2026 at 93%. If your dates are flexible, that 25-point gap is worth planning around.
Explore related pages
More routes from LAS
Other ways to fly to Seattle (SEA)
Related guides
Based on 12,547 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.