Flight Reliability
AS 644 · Alaska Airlines
Seattle → Phoenix (SEA–PHX)91% of its flights flew this route. The rest (SJC–SEA, SAN–DEN) are included in these numbers.
- 68%
- Arrive within 15 minutes
- 10 min
- Average arrival delay
- 0.4%
- Cancelled
- 1 min early
- Median arrival delay
Based on 225 historical flights. Data through May 2026.
What the data says
The late departure is the smart one here.
AS 644 departing between 6–9 PM arrived on time 68% of the time, versus 55% between 9 PM–12 AM.
Tuesdays have been rough.
AS 644 arrived on time 86% of the time on Saturdays and just 52% on Tuesdays. That gap is worth planning around.
Lagging the SEA–PHX route.
AS 644 arrived on time 68% of the time, versus 80% across the SEA–PHX route.
Lagging the Alaska Airlines network.
AS 644 arrived on time 68% of the time, versus 80% across the Alaska Airlines network.
The breakdown
- Mon76%(42 flights)
- Tue52%(23 flights)
- Wed68%(28 flights)
- Thu64%(36 flights)
- Fri67%(30 flights)
- Sat86%(22 flights)
- Sun62%(42 flights)
- 12–3 PM—(1 flights)
- 6–9 PM68%(211 flights)
- 9 PM–12 AM55%(11 flights)
Jun 70% → Apr 67% on time
| Month | On-time percentage | Flights |
|---|---|---|
| June 2025 | 70% | 30 |
| July 2025 | 46% | 28 |
| August 2025 | 64% | 25 |
| September 2025 | 71% | 21 |
| October 2025 | 71% | 24 |
| November 2025 | 68% | 19 |
| December 2025 | 65% | 20 |
| January 2026 | 73% | 26 |
| April 2026 | 67% | 12 |
- Departures on time
- 69%
- Diverted
- 0.4%
- Flights flown
- 223
- Months covered
- 11
Same route, other flights
Keep nerding
Based on 225 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.