Flight AS21
Alaska Airlines flight AS21
Looking for AS21 in the air…
New York (JFK) to Seattle (SEA)
Historically, this flight arrives 15+ minutes late 31% of the time, and when it is late the delay averages 55 minutes. It was cancelled 3.6% of the time.
- On-time arrivals
- 69.0%
- Less than 15 minutes late
- Cancelled
- 3.6%
- Of scheduled flights
- Average delay when late
- 55 min
- Flights arriving 15+ minutes late
- Flights tracked
- 358
- Scheduled flights in the period
What caused the delays
- Air traffic control & airport 49%
- Airline (crew, maintenance, cleaning) 35%
- Extreme weather 8%
- Late-arriving aircraft 7%
- Security 2%
Share of delay minutes airlines attributed to each cause (BTS).
Sep 2025
Aug 2026
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 86.2% | 30 |
| October 2025 | 82.8% | 31 |
| November 2025 | 79.3% | 29 |
| December 2025 | 20.7% | 31 |
| January 2026 | 46.2% | 27 |
| February 2026 | 73.9% | 27 |
| March 2026 | 38.7% | 31 |
| April 2026 | 96.6% | 30 |
| May 2026 | 77.4% | 31 |
| June 2026 | 75.9% | 29 |
| July 2026 | 72.4% | 31 |
| August 2026 | 77.4% | 31 |
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