Route · SFO → ONT · 2020–2025 BTS data
San Francisco to Ontario
According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SFO to ONT (San Francisco to Ontario) ranks #1433 of 4927 tracked domestic routes by total flights (most flights = #1).
Data updated 2026-06-13
- 84.3%
- On-time
- +5.3 pts
- vs US avg
- 74 min
- Delay when late
- 8,471
- Flights
- #1433 of 4927
- Corpus placement
Cancelled
1.2%
Best Month
Apr 2025 92%
Worst Month
Nov 2025 69%
Distance
363 mi
Carriers
12
Monthly Performance
Recent 24 months of route data.
| Period | Flights | Delayed | Cancelled | Diverted | Carriers |
|---|---|---|---|---|---|
| Dec 2025 | 104 | 27 | 2 | 0 | F9,UA,OO |
| Nov 2025 | 105 | 33 | 2 | 0 | UA,F9 |
| Oct 2025 | 114 | 30 | 0 | 0 | OO,UA,F9 |
| Sep 2025 | 108 | 25 | 0 | 0 | UA,OO,F9 |
| Aug 2025 | 109 | 26 | 1 | 0 | OO,F9,UA |
| Jul 2025 | 104 | 30 | 0 | 0 | OO,UA,F9 |
| Jun 2025 | 104 | 28 | 0 | 0 | OO,UA,F9 |
| May 2025 | 131 | 26 | 0 | 0 | OO,UA,F9 |
| Apr 2025 | 153 | 12 | 0 | 0 | F9,OO,UA |
| Mar 2025 | 118 | 21 | 3 | 0 | OO,UA,F9 |
| Feb 2025 | 105 | 14 | 3 | 0 | OO,UA,F9 |
| Jan 2025 | 101 | 10 | 0 | 2 | OO,UA,F9 |
| Dec 2024 | 140 | 30 | 2 | 0 | F9,OO,UA |
| Nov 2024 | 180 | 44 | 5 | 0 | OO,UA,F9 |
| Oct 2024 | 165 | 14 | 1 | 0 | UA,OO,F9 |
| Sep 2024 | 148 | 28 | 0 | 0 | OO,UA,F9 |
| Aug 2024 | 140 | 26 | 1 | 0 | F9,OO,UA |
| Jul 2024 | 127 | 27 | 4 | 0 | F9,OO,UA |
| Jun 2024 | 86 | 18 | 2 | 0 | F9,OO,UA |
| May 2024 | 92 | 14 | 1 | 0 | F9,OO,UA |
| Apr 2024 | 90 | 24 | 0 | 0 | F9,OO,UA |
| Mar 2024 | 120 | 31 | 1 | 0 | F9,OO,UA |
| Feb 2024 | 98 | 19 | 5 | 1 | F9,OO |
| Jan 2024 | 99 | 18 | 0 | 0 | F9,OO |
SFO–ONT seasonal on-time pattern
Best: April (87.0%) · weakest: December (80.8%)
Strongest calendar month
April
87.0% on-time · ~114 flights/mo
Busiest calendar month
October
~136 flights/mo avg
Weakest calendar month
December
80.8% on-time · ~111 flights/mo
Cancellation Rate
1.2%
33 of 2,841 flights
Diversion Rate
0.1%
3 of 2,841 flights
Explore origin & destination
On-time and delay data for the airports this route connects.
SFO - San Francisco
Full on-time, delay-cause, and seasonal performance for San Francisco, CA.
SFO on-time profileONT - Ontario
Full on-time, delay-cause, and seasonal performance for Ontario, CA.
ONT on-time profileCompare the two airports
See SFO and ONT side by side on delays, cancellations, and reliability.
Compare SFO vs ONTOrigin-hub reliability standing
Mid-pack among SFO departures
From SFO, this corridor sits with 50 other 75–85% on-time routes out of 73 tracked departures, not the hub's reliability leaders (20 at ≥85%) and not the softest ( 3 below 75%). Destination: Ontario · fleet on-time rank #1486 of 4927.
Similar routes
Other BTS-tracked routes with comparable performance or trip length to SFO–ONT.
Routes with a similar on-time rate
What the Data Says About SFO to ONT
Bureau of Transportation Statistics records show San Francisco to Ontario (SFO to ONT) running a 84.3% on-time rate over 8,471 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 73.5 minutes. The 363-mile corridor is served by 12 carriers, and over the last 24 months 1.2% of 2,841 flights were cancelled, 0.1% diverted.
The monthly split is wide on this route: Apr 2025 posted the strongest performance at 92% on-time, while Nov 2025 came in at just 69% - a 24-point swing worth factoring into travel timing.
On the multi-year calendar, SFO–ONT peaks in April at 87.0% on-time while October carries the heaviest traffic (~136 flights per month) ; the softest month is December at 80.8%, a 6.2-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.
Frequently Asked Questions
Where does SFO to ONT rank among US routes by traffic? ▼
How often are flights delayed from SFO to ONT? ▼
What is the cancellation rate for SFO to ONT? ▼
How far is the flight from SFO to ONT? ▼
When is the best time to fly from SFO to ONT? ▼
Airports on this route
Data source
Data Source: Bureau of Transportation Statistics (BTS), On-Time Performance Data. Statistics reflect cumulative performance across all available reporting periods.
Read our methodology - how this data is sourced, computed, and verified.
Using SFO–ONT data
SFO–ONT runs 5.3 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.
- Compare SFO and ONT airport profiles: delay causes and top routes differ even on the same corridor. SFO airport
- If your dates flex, April (87.0% on-time) beats December (80.8%) on this corridor. Seasonal chart
- 4 other routes post a similar 84.3% on-time rate; compare before you commit to this pairing. Similar routes
On-time rate reflects the BTS historical average across all reporting carriers on this origin–destination pair, not any single flight or booking recommendation.
Every figure on PlainFlights is rendered directly from BTS On-Time Performance data, no number is typed in by an editor. This page aggregates this specific route's on-time performance and monthly trend, live from the dataset. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.