Flight Reliability
AS 654 · Alaska Airlines
Ontario → Seattle (ONT–SEA)
85
Pretty Reliable
WanderNerd Reliability Score
- 91%
- Arrive within 15 minutes
- 7 min early
- Average arrival delay
- 3.7%
- Cancelled
- 13 min early
- Median arrival delay
Based on 218 historical flights. Data through May 2026.
What the data says
Thursday is the weak spot.
AS 654 arrived on time 97% of the time on Tuesdays. On Thursdays: 83%.
A bit ahead of the ONT–SEA route.
AS 654 arrived on time 91% of the time, versus 87% across the ONT–SEA route.
Better than the Alaska Airlines network average.
AS 654 arrived on time 91% of the time, versus 80% across the Alaska Airlines network.
Keep a backup plan handy.
AS 654 was cancelled 3.7% of the time. Typical for U.S. flights is around 1–2%.
The breakdown
- Mon90%(31 flights)
- Tue97%(31 flights)
- Wed97%(30 flights)
- Thu83%(29 flights)
- Fri89%(28 flights)
- Sat90%(29 flights)
- Sun94%(32 flights)
- 9 AM–12 PM92%(145 flights)
- 12–3 PM91%(65 flights)
93%
May
Nov 89% → May 93% on time
| Month | On-time percentage | Flights |
|---|---|---|
| November 2025 | 89% | 27 |
| December 2025 | 87% | 30 |
| January 2026 | 93% | 30 |
| February 2026 | 100% | 28 |
| March 2026 | 83% | 30 |
| April 2026 | 97% | 30 |
| May 2026 | 93% | 29 |
- Departures on time
- 86%
- Diverted
- 0%
- Flights flown
- 210
- Months covered
- 8
Same route, other flights
Keep nerding
Based on 218 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.