Seattle (SEA) to Las Vegas (LAS): On-Time Performance
Data through July 2026
The calendar drives reliability on SEA–LAS. November 2024 flights landed on schedule 87% of the time, but June 2025 dropped to 68% — a gap of 19 points. Across the full period the route averages 77% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 69%), which matters most in the rough months.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 13 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 15
- last 12 months
- Duration
- 2h 35m
- scheduled
- Distance
- 867 mi
Best airline from SEA to LAS
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 84% | 10 min | 0.7% | 3,628 |
| Alaska Airlines | 76% | 12 min | 0.8% | 5,630 |
| Southwest Airlines | 73% | 14 min | 0.3% | 2,045 |
| Spirit Airlines | 71% | 17 min | 1.2% | 694 |
| Frontier Airlines | 70% | 33 min | 1.9% | 524 |
Monthly on-time trend
Best time to fly from SEA to LAS
Aim for departures around 6 a.m. (94% on-time); avoid 9 p.m. departures (64%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 14 min |
| Tuesdaybest | 84% | 9 min |
| Wednesday | 82% | 9 min |
| Thursday | 72% | 16 min |
| Friday | 74% | 18 min |
| Saturday | 82% | 11 min |
| Sunday | 76% | 13 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft32%
- Airline operations36%
- National airspace system28%
- Weather3%
Frequently asked questions
- How often are flights from SEA to LAS delayed?
- 23% of SEA–LAS 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 SEA to LAS?
- Delta Air Lines has the best on-time record on this route at 84%, based on 3,628 flights. 5 airlines flew SEA–LAS frequently enough to compare in this period.
- What is the best time of day to fly from SEA to LAS?
- Departures around 6 a.m. have the best record (94% on-time), while departures around 9 p.m. have the worst (64%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to LAS?
- The scheduled SEA–LAS flight time averages 2h 35m over 867 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are SEA to LAS flights cancelled?
- 0.7% 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 SEA to LAS?
- June 2025 was the roughest month in this dataset, with only 68% of arrivals on time. The best was November 2024 at 87%. If your dates are flexible, that 19-point gap is worth planning around.
Explore related pages
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Based on 12,560 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.