Best Time to Fly LAS to SEA: On-Time Stats by Hour & Airline
Harry Reid International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 82.4% of Las Vegas (LAS) to Seattle (SEA) flights arrived on time (5,619 scheduled flights). That is 4.8 points above the national average of 77.6%.
Among 4 airlines, Delta Air Lines led with 87.5% on time and Southwest Airlines was last with 71.5%.
Over 24 months, Wednesday was the most reliable day (88% on time) and August the worst month (73%).
The cancellation rate was 0.9% (US average 1.8%).
LAS to SEA on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 87.5% | 88 min | 1.0% | 1,742 |
| Alaska Airlines | 83.1% | 66 min | 1.1% | 2,621 |
| Frontier Airlines | 81.6% | 51 min | 1.1% | 260 |
| Southwest Airlines | 71.5% | 44 min | 0.2% | 977 |
| SkyWest Airlines | Limited data | 7 | ||
| Spirit Airlines | Limited data | 12 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly LAS to SEA
On-time arrival % by scheduled departure hour (local time), 11,957 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | Limited data | 6 | |
| 6am–7am | 94.7% | 0.6% | 1,381 |
| 7am–8am | 82.4% | 0.9% | 885 |
| 8am–9am | 79.7% | 1.5% | 615 |
| 9am–10am | 87.9% | 0.4% | 523 |
| 10am–11am | 87.7% | 0.4% | 1,081 |
| 11am–12pm | 87.1% | 1.0% | 961 |
| 12pm–1pm | 82.6% | 1.2% | 572 |
| 1pm–2pm | 84.4% | 0.1% | 719 |
| 2pm–3pm | 76.6% | 0.7% | 862 |
| 3pm–4pm | 77.3% | 0.6% | 859 |
| 4pm–5pm | 69.4% | 0.8% | 513 |
| 5pm–6pm | 75.9% | 0.8% | 749 |
| 6pm–7pm | 75.2% | 1.3% | 299 |
| 7pm–8pm | 72.3% | 0.7% | 837 |
| 8pm–9pm | 72.2% | 1.5% | 340 |
| 9pm–10pm | 72.4% | 1.3% | 605 |
| 10pm–11pm | 60.0% | 0.0% | 150 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on LAS to SEA
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 83.6% | +1.4 pts | 0.5% | 208 |
| Christmas & New Year (Dec 20 - Jan 3) | 80.5% | -1.7 pts | 0.2% | 447 |
| Summer peak (Jun 15 - Aug 15) | 76.9% | -5.3 pts | 0.8% | 2,080 |
| All other days | 82.2% | — | 0.8% | 9,222 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).