Best Time to Fly SEA to LAS: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Harry Reid International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 78.1% of Seattle (SEA) to Las Vegas (LAS) flights arrived on time (5,621 scheduled flights). That is in line with the national average of 77.6%.
Among 4 airlines, Delta Air Lines led with 82.9% on time and Frontier Airlines was last with 68.5%.
Over 24 months, Tuesday was the most reliable day (85% on time) and July the worst month (71%).
The cancellation rate was 0.8% (US average 1.8%).
SEA to LAS 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 | 82.9% | 55 min | 1.0% | 1,742 |
| Alaska Airlines | 78.8% | 47 min | 0.8% | 2,622 |
| Southwest Airlines | 70.1% | 48 min | 0.5% | 976 |
| Frontier Airlines | 68.5% | 128 min | 1.1% | 260 |
| SkyWest Airlines | Limited data | 9 | ||
| Spirit Airlines | Limited data | 12 | ||
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to LAS
On-time arrival % by scheduled departure hour (local time), 11,971 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 94.0% | 1.6% | 187 |
| 6am–7am | 94.6% | 0.7% | 557 |
| 7am–8am | 90.7% | 1.0% | 1,087 |
| 8am–9am | 86.9% | 1.3% | 602 |
| 9am–10am | 86.7% | 0.0% | 391 |
| 10am–11am | 81.5% | 0.5% | 1,087 |
| 11am–12pm | 76.5% | 0.0% | 621 |
| 12pm–1pm | 78.4% | 0.9% | 1,143 |
| 1pm–2pm | 73.9% | 0.0% | 487 |
| 2pm–3pm | 78.2% | 0.2% | 628 |
| 3pm–4pm | 67.5% | 1.4% | 864 |
| 4pm–5pm | 73.8% | 0.5% | 860 |
| 5pm–6pm | 66.0% | 0.4% | 783 |
| 6pm–7pm | 68.2% | 0.6% | 791 |
| 7pm–8pm | 76.3% | 0.5% | 650 |
| 8pm–9pm | 75.8% | 0.7% | 725 |
| 9pm–10pm | 65.6% | 1.0% | 493 |
| 10pm–11pm | Limited data | 15 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on SEA to LAS
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) | 80.8% | +1.2 pts | 0.5% | 215 |
| Christmas & New Year (Dec 20 - Jan 3) | 70.3% | -9.4 pts | 0.0% | 445 |
| Summer peak (Jun 15 - Aug 15) | 70.8% | -8.8 pts | 0.7% | 2,080 |
| All other days | 79.6% | — | 0.7% | 9,231 |
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).