Best Time to Fly PHX to SEA: On-Time Stats by Hour & Airline
Phoenix Sky Harbor International → Seattle/Tacoma International
Data through July 2026 · Last updated October 18, 2026
7,226 flights were scheduled from Phoenix (PHX) to Seattle (SEA) in the last 12 months, and 82.4% of those that flew arrived on time, 4.8 points above the US average of 77.6%.
Among 7 airlines, Envoy Air led with 88.3% on time and Southwest Airlines was last with 62.8%.
Over 24 months, Tuesday was the most reliable day (85% on time) and June the worst month (77%).
The cancellation rate was 0.7% (US average 1.8%).
PHX 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 |
|---|---|---|---|---|
| Envoy Air | 88.3% | 47 min | 0.0% | 755 |
| Delta Air Lines | 87.7% | 74 min | 1.0% | 1,765 |
| Frontier Airlines | 84.9% | 78 min | 0.0% | 139 |
| Alaska Airlines | 84.5% | 56 min | 0.7% | 2,884 |
| SkyWest Airlines | 83.0% | 63 min | 0.5% | 445 |
| American Airlines | 81.7% | 52 min | 0.5% | 198 |
| Southwest Airlines | 62.8% | 45 min | 0.6% | 1,040 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly PHX to SEA
On-time arrival % by scheduled departure hour (local time), 14,578 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 12am–1am | Limited data | 1 | |
| 5am–6am | 96.0% | 0.6% | 174 |
| 6am–7am | 93.8% | 0.6% | 1,244 |
| 7am–8am | 84.2% | 0.2% | 1,374 |
| 8am–9am | 84.7% | 0.2% | 1,033 |
| 9am–10am | 81.9% | 0.4% | 689 |
| 10am–11am | 85.6% | 0.3% | 620 |
| 11am–12pm | 86.6% | 0.4% | 1,406 |
| 12pm–1pm | 88.4% | 1.0% | 699 |
| 1pm–2pm | 80.9% | 0.2% | 972 |
| 2pm–3pm | 82.4% | 0.3% | 909 |
| 3pm–4pm | 78.9% | 0.8% | 1,140 |
| 4pm–5pm | 73.6% | 0.7% | 599 |
| 5pm–6pm | 77.2% | 0.5% | 1,405 |
| 6pm–7pm | 75.4% | 0.1% | 661 |
| 7pm–8pm | 79.8% | 0.3% | 724 |
| 8pm–9pm | 80.8% | 0.2% | 427 |
| 9pm–10pm | 68.0% | 1.3% | 316 |
| 10pm–11pm | 62.7% | 2.2% | 181 |
| 11pm–12am | Limited data | 4 | |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on PHX 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) | 80.0% | -3.5 pts | 0.3% | 286 |
| Christmas & New Year (Dec 20 - Jan 3) | 79.4% | -4.1 pts | 0.3% | 607 |
| Summer peak (Jun 15 - Aug 15) | 78.0% | -5.5 pts | 0.5% | 2,396 |
| All other days | 83.5% | — | 0.5% | 11,289 |
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).