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Route · SLC → ONT · 2020–2025 BTS data

Salt Lake City to Ontario

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SLC to ONT (Salt Lake City to Ontario) ranks #1600 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

89.4%
On-time
+10.4 pts
vs US avg
66 min
Delay when late
7,788
Flights
#1600 of 4927
Corpus placement

Cancelled

0.7%

Best Month

Jan 2025 95%

Worst Month

Sep 2024 80%

Distance

558 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 90 12 0 0 DL,OO
Nov 2025 88 8 3 0 OO,DL
Oct 2025 115 10 0 0 OO,DL
Sep 2025 110 10 0 0 OO,DL
Aug 2025 118 10 1 0 OO,DL
Jul 2025 116 12 0 0 DL,OO
Jun 2025 114 17 1 0 DL,OO
May 2025 113 8 0 0 DL,OO
Apr 2025 90 6 0 0 DL,OO
Mar 2025 91 13 0 0 DL,OO
Feb 2025 81 12 0 0 DL,OO,F9
Jan 2025 97 5 0 1 DL,OO,F9
Dec 2024 94 7 0 1 DL,F9,OO
Nov 2024 88 6 0 0 OO,DL
Oct 2024 94 5 0 0 OO,DL,F9
Sep 2024 99 20 0 0 OO,DL,F9
Aug 2024 110 11 1 0 DL,F9,OO
Jul 2024 123 21 8 0 DL,F9,OO
Jun 2024 119 14 2 0 DL,F9,OO
May 2024 118 16 0 0 DL,F9,OO
Apr 2024 107 20 1 0 DL,F9,OO
Mar 2024 88 12 0 0 DL,OO
Feb 2024 78 5 0 0 DL,OO
Jan 2024 95 19 0 0 DL,OO

SLC–ONT seasonal on-time pattern

Best: February (92.3%) · weakest: December (84.2%)

82%84%86%88%90%92%94% JanFebMarAprMayJunJulAugSepOctNovDec 84.2%

Strongest calendar month

February

92.3% on-time · ~89 flights/mo

Busiest calendar month

July

~123 flights/mo avg

Weakest calendar month

December

84.2% on-time · ~107 flights/mo

Cancellation Rate

0.7%

17 of 2,436 flights

Diversion Rate

0.1%

2 of 2,436 flights

Explore origin & destination

On-time and delay data for the airports this route connects.

SLC - Salt Lake City

Full on-time, delay-cause, and seasonal performance for Salt Lake City, UT.

SLC on-time profile

ONT - Ontario

Full on-time, delay-cause, and seasonal performance for Ontario, CA.

ONT on-time profile

Compare the two airports

See SLC and ONT side by side on delays, cancellations, and reliability.

Compare SLC vs ONT

Origin-hub reliability standing

Among SLC's stronger departures

SLC → ONT posts a 89.4% on-time rate, landing in the ≥85% band with 54 of 85 BTS-tracked routes leaving Salt Lake City. The same hub also shows 31 mid-band and 0 challenged departures · fleet-wide on-time rank #198 of 4927 (highest on-time = #1).

What the Data Says About SLC to ONT

Salt Lake City to Ontario (SLC to ONT) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 89.4% on-time rate across 7,788 flights, with delays that do happen averaging 66.3 minutes. The corridor runs roughly 558 miles and is served by 8 carriers. Over the most recent 24 months, 17 of 2,436 flights were cancelled (0.7%) and 2 diverted (0.1%).

The monthly split is wide on this route: Jan 2025 posted the strongest performance at 95% on-time, while Sep 2024 came in at just 80% - a 15-point swing worth factoring into travel timing.

On the multi-year calendar, SLC–ONT peaks in February at 92.3% on-time while July carries the heaviest traffic (~123 flights per month) ; the softest month is December at 84.2%, a 8.1-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SLC to ONT rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SLC to ONT ranks #1600 of 4927 tracked domestic routes by total flights (most flights = #1). That ordinal matches our busiest-routes listing (total_flights DESC). See /methodology#corpus-placement for the exact sort basis.
How often are flights delayed from SLC to ONT? ▼
Flights from Salt Lake City to Ontario have a 89.4% on-time rate based on 7,788 flights. The average delay is 66.3 minutes. The best recent month was Jan 2025 with 95% on-time.
What is the cancellation rate for SLC to ONT? ▼
Over the last 24 months, 0.7% of flights on this route were cancelled (17 of 2,436 flights) and 0.1% were diverted.
How far is the flight from SLC to ONT? ▼
The flight distance from Salt Lake City (SLC) to Ontario (ONT) is approximately 558 miles. This route is served by 8 carriers.
When is the best time to fly from SLC to ONT? ▼
The best recent month for on-time performance was Jan 2025 (95% on-time). The worst was Sep 2024 (80% on-time). Consider booking during months with historically better performance.

Airports on this route

SLC Airport

Salt Lake City
ONT Airport

Ontario
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 SLC–ONT data

SLC–ONT runs 10.4 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SLC and ONT airport profiles: delay causes and top routes differ even on the same corridor. SLC airport
  • If your dates flex, February (92.3% on-time) beats December (84.2%) on this corridor. Seasonal chart
  • 4 other routes post a similar 89.4% 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.

Data sourced from U.S. Department of Transportation Bureau of Transportation Statistics (BTS) On-Time Performance data. See our methodology for details. Retrieved and formatted by PlainFlights

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.