Route Reliability
Ontario → STS
ONT–STS · 423 miles · Ontario International Airport to STS Airport
100
Nerd Approved
WanderNerd Reliability Score
- 93%
- Arrive within 15 minutes
- 6 min early
- Average arrival delay
- 0%
- Cancelled
- 75
- Flights in the data
Data through May 2026.
Alaska Airlines is the only airline in this data on this route, arriving on time 93% of the time across 75 flights. No comparison to make.
What the data says
The 3–6 PM departure wins.
ONT–STS flights departing between 3–6 PM arrived on time 96% of the time, versus 86% between 12–3 PM.
Saturdays have been rough.
ONT–STS flights arrived on time 100% of the time on Mondays and just 82% on Saturdays. That gap is worth planning around.
Flights on this route
The breakdown
- Mon100%(10 flights)
- Tue90%(10 flights)
- Wed100%(11 flights)
- Thu91%(11 flights)
- Fri100%(11 flights)
- Sat82%(11 flights)
- Sun91%(11 flights)
- 12–3 PM86%(21 flights)
- 3–6 PM96%(54 flights)
97%
May
Mar 86% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| March 2026 | 86% | 14 |
| April 2026 | 93% | 30 |
| May 2026 | 97% | 31 |
Same trip, other airports
Keep nerding
Based on 75 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.