Best Time to Fly SEA to PHX: On-Time Stats by Hour & Airline
Seattle/Tacoma International → Phoenix Sky Harbor International
Data through July 2026 · Last updated October 18, 2026
7,225 flights were scheduled from Seattle (SEA) to Phoenix (PHX) in the last 12 months, and 78.7% of those that flew arrived on time, 1.1 points above the US average of 77.6%.
Envoy Air was the most punctual of the 7 airlines on the route at 85.6%, while Southwest Airlines trailed at 67.4%.
April has been the best month (85% on time) and Thursday the weakest day of the week (76%).
0.7% of flights were cancelled, versus 1.8% nationally.
SEA to PHX 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 |
|---|---|---|---|---|
| Envoy Air | 85.6% | 74 min | 0.0% | 754 |
| American Airlines | 85.6% | 77 min | 0.5% | 195 |
| Delta Air Lines | 81.6% | 69 min | 1.0% | 1,766 |
| SkyWest Airlines | 79.5% | 78 min | 0.5% | 445 |
| Alaska Airlines | 79.1% | 44 min | 0.6% | 2,887 |
| Frontier Airlines | 70.7% | 139 min | 4.3% | 139 |
| Southwest Airlines | 67.4% | 49 min | 0.8% | 1,039 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly SEA to PHX
On-time arrival % by scheduled departure hour (local time), 14,574 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 92.8% | 0.9% | 335 |
| 6am–7am | 91.1% | 0.3% | 1,153 |
| 7am–8am | 91.8% | 0.2% | 1,301 |
| 8am–9am | 85.8% | 0.8% | 470 |
| 9am–10am | 80.9% | 0.8% | 914 |
| 10am–11am | 78.4% | 0.6% | 660 |
| 11am–12pm | 75.5% | 0.6% | 2,136 |
| 12pm–1pm | 79.0% | 0.7% | 292 |
| 1pm–2pm | 77.0% | 0.5% | 999 |
| 2pm–3pm | 78.4% | 0.3% | 577 |
| 3pm–4pm | 75.9% | 0.3% | 1,381 |
| 4pm–5pm | 76.2% | 0.2% | 526 |
| 5pm–6pm | 75.6% | 0.2% | 1,092 |
| 6pm–7pm | 73.6% | 0.4% | 925 |
| 7pm–8pm | 75.1% | 0.4% | 782 |
| 8pm–9pm | 73.4% | 1.0% | 824 |
| 9pm–10pm | 72.3% | 1.1% | 179 |
| 10pm–11pm | Limited data | 28 | |
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 PHX
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) | 77.1% | -4.2 pts | 0.3% | 285 |
| Christmas & New Year (Dec 20 - Jan 3) | 72.4% | -8.9 pts | 0.2% | 609 |
| Summer peak (Jun 15 - Aug 15) | 72.7% | -8.6 pts | 0.5% | 2,397 |
| All other days | 81.3% | — | 0.5% | 11,283 |
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).