Flight AS477
Alaska Airlines flight AS477
Looking for AS477 in the air…
Seattle (SEA) to Newark (EWR)
Historically, this flight arrives 15+ minutes late 24% of the time, and when it is late the delay averages 62 minutes. It was cancelled 2.7% of the time.
- On-time arrivals
- 76.4%
- Less than 15 minutes late
- Cancelled
- 2.7%
- Of scheduled flights
- Average delay when late
- 62 min
- Flights arriving 15+ minutes late
- Flights tracked
- 330
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 57%
- Airline (crew, maintenance, cleaning) 20%
- Late-arriving aircraft 14%
- Extreme weather 8%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Boston (BOS) to Seattle (SEA)
Only 8 flights on record, which is too few for reliable odds.
- On-time arrivals
- 75.0%
- Less than 15 minutes late
- Cancelled
- 0.0%
- Of scheduled flights
- Average delay when late
- 37 min
- Flights arriving 15+ minutes late
- Flights tracked
- 8
- Scheduled flights in the period
What caused the delays
- Airline (crew, maintenance, cleaning) 56%
- Air traffic control & airport 44%
- Late-arriving aircraft 0%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 80.0% | 30 |
| October 2025 | 51.7% | 30 |
| November 2025 | 70.4% | 30 |
| December 2025 | 67.7% | 31 |
| January 2026 | 76.7% | 31 |
| February 2026 | 84.6% | 28 |
| March 2026 | 80.6% | 31 |
| April 2026 | 95.2% | 21 |
| May 2026 | 89.5% | 19 |
| June 2026 | 82.8% | 30 |
| July 2026 | 74.1% | 31 |
| August 2026 | 73.1% | 26 |
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