Phoenix (PHX) to Seattle (SEA): On-Time Performance
Data through July 2026
The calendar drives reliability on PHX–SEA. February 2026 flights landed on schedule 90% of the time, but July 2024 dropped to 68% — a gap of 22 points. Across the full period the route averages 82% on-time against a national 78%. Morning departures also hold up better than evening ones (86% vs 75%), which matters most in the rough months.
- On-time
- 82%
- arrived <15 min late
- Avg delay
- 11 min
- completed flights
- Cancelled
- 0.5%
- Flights/day
- 20
- last 12 months
- Duration
- 3h 12m
- scheduled
- Distance
- 1,107 mi
Best airline from PHX to SEA
7 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Linesmost reliable | 89% | 10 min | 0.8% | 3,656 |
| Envoy Air | 86% | 7 min | 0.0% | 1,099 |
| Alaska Airlines | 83% | 10 min | 0.6% | 6,038 |
| American Airlines | 81% | 11 min | 0.5% | 211 |
| SkyWest Airlines | 79% | 12 min | 0.2% | 1,529 |
| Frontier Airlines | 78% | 16 min | 0.4% | 455 |
| Southwest Airlines | 68% | 16 min | 0.3% | 2,203 |
Monthly on-time trend
Best time to fly from PHX to SEA
Aim for departures around 5 a.m. (96% on-time); avoid 10 p.m. departures (63%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 81% | 12 min |
| Tuesdaybest | 84% | 10 min |
| Wednesday | 83% | 10 min |
| Thursday | 80% | 12 min |
| Friday | 80% | 13 min |
| Saturday | 83% | 9 min |
| Sunday | 82% | 11 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft44%
- Airline operations37%
- National airspace system16%
- Weather3%
Frequently asked questions
- How often are flights from PHX to SEA delayed?
- 18% of PHX–SEA 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 11 minutes.
- Which airline is most reliable from PHX to SEA?
- Delta Air Lines has the best on-time record on this route at 89%, based on 3,656 flights. 7 airlines flew PHX–SEA frequently enough to compare in this period.
- What is the best time of day to fly from PHX to SEA?
- Departures around 5 a.m. have the best record (96% on-time), while departures around 10 p.m. have the worst (63%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from PHX to SEA?
- The scheduled PHX–SEA flight time averages 3h 12m over 1,107 miles. Actual arrival times vary — flights on this route land 15+ minutes late 18% of the time.
- How often are PHX to SEA flights cancelled?
- 0.5% 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 PHX to SEA?
- July 2024 was the roughest month in this dataset, with only 68% of arrivals on time. The best was February 2026 at 90%. If your dates are flexible, that 22-point gap is worth planning around.
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Based on 15,191 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.