Las Vegas (LAS) to Seattle (SEA): On-Time Performance
Data through May 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 80% 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
- 80%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.9%
- Flights/day
- 16
- last 12 months
- Duration
- 2h 48m
- scheduled
- Distance
- 867 mi
Best airline from LAS to SEA
5 airlines flew this route regularly between 2024-06 and 2026-05.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 87% | 10 min | 0.6% | 3,473 |
| Frontier Airlines | 82% | 13 min | 1.5% | 482 |
| Alaska Airlines | 79% | 14 min | 1.1% | 5,436 |
| Spirit Airlines | 77% | 14 min | 0.9% | 755 |
| Southwest Airlines | 72% | 14 min | 0.4% | 1,951 |
Monthly on-time trend
Best time to fly from LAS to SEA
Aim for departures around 5 a.m. (98% on-time); avoid 10 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 11 min |
| Tuesday | 86% | 10 min |
| Wednesdaybest | 86% | 8 min |
| Thursday | 77% | 15 min |
| Friday | 74% | 18 min |
| Saturday | 84% | 12 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 operations33%
- 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 2024-06 and 2026-05. 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 3,473 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 5 a.m. have the best record (98% on-time), while departures around 10 p.m. have the worst (63%). 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?
- 0.9% 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 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
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Based on 12,133 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.