Route
SMF → ONT
Sacramento International Airport Ontario International Airport
How punctual is this route?
- On-time arrivals
- 84.0%
- Less than 15 minutes late
- Cancelled
- 0.3%
- Of scheduled flights
- Average delay when late
- 57 min
- Flights arriving 15+ minutes late
- Flights tracked
- 2,108
- Scheduled flights in the period
What caused the delays
- Late-arriving aircraft 67%
- Airline (crew, maintenance, cleaning) 29%
- Air traffic control & airport 4%
- Extreme weather 0%
- Security 0%
Share of delay minutes airlines attributed to each cause (BTS).
Show as table
| Month | On time | Flights |
|---|---|---|
| September 2025 | 89.3% | 177 |
| October 2025 | 85.0% | 181 |
| November 2025 | 86.4% | 178 |
| December 2025 | 80.2% | 179 |
| January 2026 | 85.2% | 155 |
| February 2026 | 84.9% | 152 |
| March 2026 | 87.0% | 184 |
| April 2026 | 83.7% | 184 |
| May 2026 | 83.3% | 187 |
| June 2026 | 75.0% | 177 |
| July 2026 | 82.8% | 183 |
| August 2026 | 85.4% | 171 |
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
Airlines on this route
| Airline | Flights | On time | Cancelled | Avg. delay when late |
|---|---|---|---|---|
| Southwest Airlines | 2,108 | 84.0% | 0.3% | 57 min |
Delay odds by flight
How often each flight number arrived 15 or more minutes late over the last year.
-
WN3977
5% late · 64 flights
-
WN1182
14% late · 58 flights
-
WN1288
19% late · 58 flights
-
WN860
2% late · 58 flights
-
WN938
19% late · 58 flights
-
WN742
26% late · 57 flights
-
WN1048
4% late · 53 flights
-
WN3805
10% late · 52 flights
-
WN4984
33% late · 52 flights
-
WN715
23% late · 47 flights
-
WN1229
17% late · 46 flights
-
WN3994
16% late · 45 flights
-
WN480
26% late · 44 flights
-
WN3807
17% late · 43 flights
-
WN1563
19% late · 42 flights
-
WN4226
5% late · 42 flights
-
WN4374
17% late · 42 flights
-
WN2985
0% late · 39 flights
-
WN504
11% late · 38 flights
-
WN1560
33% late · 36 flights
-
WN300
28% late · 36 flights
-
WN4911
3% late · 36 flights
-
WN1010
18% late · 33 flights
-
WN3452
9% late · 33 flights
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