Route Reliability
STS → Ontario
STS–ONT · 423 miles · STS Airport to Ontario International Airport
100
Nerd Approved
WanderNerd Reliability Score
- 92%
- Arrive within 15 minutes
- 0 min
- 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 92% of the time across 75 flights. No comparison to make.
What the data says
The 3–6 PM departure wins.
STS–ONT flights departing between 3–6 PM arrived on time 100% of the time, versus 89% between 12–3 PM.
Tuesdays have been rough.
STS–ONT flights arrived on time 100% of the time on Mondays and just 70% on Tuesdays. That gap is worth planning around.
Flights on this route
The breakdown
- Mon100%(10 flights)
- Tue70%(10 flights)
- Wed91%(11 flights)
- Thu100%(11 flights)
- Fri100%(11 flights)
- Sat91%(11 flights)
- Sun91%(11 flights)
- 9 AM–12 PM91%(21 flights)
- 12–3 PM89%(35 flights)
- 3–6 PM100%(19 flights)
97%
May
Mar 86% → May 97% on time
| Month | On-time percentage | Flights |
|---|---|---|
| March 2026 | 86% | 14 |
| April 2026 | 90% | 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.