Seattle (SEA) to Pittsburgh (PIT): On-Time Performance
Data through May 2026
The calendar drives reliability on SEA–PIT. November 2024 flights landed on schedule 96% of the time, but August 2024 dropped to 65% — a gap of 31 points. Across the full period the route averages 77% on-time against a national 78%.
- On-time
- 77%
- arrived <15 min late
- Avg delay
- 12 min
- completed flights
- Cancelled
- 0.7%
- Flights/day
- 1.3
- last 12 months
- Duration
- 4h 37m
- scheduled
- Distance
- 2,125 mi
Monthly on-time trend
Best time to fly from SEA to PIT
Aim for departures around 1 p.m. (88% on-time); avoid 11 a.m. departures (71%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 74% | 15 min |
| Tuesdaybest | 85% | 7 min |
| Wednesday | 81% | 8 min |
| Thursday | 80% | 10 min |
| Friday | 72% | 15 min |
| Saturday | 79% | 10 min |
| Sunday | 73% | 16 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft40%
- Airline operations42%
- National airspace system17%
- Weather1%
Frequently asked questions
- How often are flights from SEA to PIT delayed?
- 23% of SEA–PIT flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-06 and 2026-05. The average arrival delay across completed flights was 12 minutes.
- What is the best time of day to fly from SEA to PIT?
- Departures around 1 p.m. have the best record (88% on-time), while departures around 11 a.m. have the worst (71%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from SEA to PIT?
- The scheduled SEA–PIT flight time averages 4h 37m over 2,125 miles. Actual arrival times vary — flights on this route land 15+ minutes late 23% of the time.
- How often are SEA to PIT flights cancelled?
- 0.7% of scheduled flights on this route were cancelled between 2024-06 and 2026-05, at or below the national rate of 1.6%.
- What is the worst month to fly from SEA to PIT?
- August 2024 was the roughest month in this dataset, with only 65% of arrivals on time. The best was November 2024 at 96%. If your dates are flexible, that 31-point gap is worth planning around.
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Based on 900 flights, 2024-06–2026-05. Source: US DOT Bureau of Transportation Statistics. Updated 2026-07-01.