Route
PIT → SEA
Pittsburgh International Airport Seattle–Tacoma International Airport
2,125 miles
Return route SEA → PIT →
How punctual is this route?
- On-time arrivals
- 74.0%
- Less than 15 minutes late
- Cancelled
- 1.1%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 474
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 44%
- Air traffic control & airport 29%
- Airline (crew, maintenance, cleaning) 18%
- Extreme weather 8%
- Security 1%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 84.6% | 52 |
| October 2025 | 93.9% | 34 |
| November 2025 | 92.3% | 26 |
| December 2025 | 41.4% | 29 |
| January 2026 | 71.4% | 23 |
| February 2026 | 76.2% | 21 |
| March 2026 | 50.0% | 26 |
| April 2026 | 73.3% | 30 |
| May 2026 | 81.6% | 50 |
| June 2026 | 71.7% | 60 |
| July 2026 | 80.0% | 61 |
| August 2026 | 62.9% | 62 |
Source: U.S. DOT Bureau of Transportation Statistics on-time data, September 2025 – August 2026. Covers flights operated by reporting U.S. carriers. About our data
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Alaska Airlines | 474 | 74.0% | 1.1% | 55 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
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