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Route · ONT → SLC · 2020–2025 BTS data

Ontario to Salt Lake City

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), ONT to SLC (Ontario to Salt Lake City) ranks #1601 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

91.7%
On-time
+12.7 pts
vs US avg
95 min
Delay when late
7,786
Flights
#1601 of 4927
Corpus placement

Cancelled

0.9%

Best Month

Nov 2024 99%

Worst Month

Apr 2024 82%

Distance

558 mi

Carriers

8

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 90 13 0 0 DL,OO
Nov 2025 88 7 3 0 OO,DL
Oct 2025 115 7 0 0 OO,DL
Sep 2025 110 10 0 0 OO,DL
Aug 2025 118 6 1 0 OO,DL
Jul 2025 116 10 0 0 DL,OO
Jun 2025 114 7 1 0 DL,OO
May 2025 113 8 0 0 DL,OO
Apr 2025 90 2 0 0 DL,OO
Mar 2025 91 3 0 0 DL,OO
Feb 2025 81 9 0 0 OO,DL,F9
Jan 2025 97 9 0 0 DL,OO,F9
Dec 2024 94 6 0 0 DL,F9,OO
Nov 2024 88 1 0 0 OO,DL
Oct 2024 94 2 0 0 OO,DL,F9
Sep 2024 99 7 0 0 OO,DL,F9
Aug 2024 110 11 1 0 DL,F9,OO
Jul 2024 123 12 10 0 DL,F9,OO
Jun 2024 119 9 4 0 DL,F9,OO
May 2024 118 17 0 0 DL,F9,OO
Apr 2024 107 19 1 0 DL,F9,OO
Mar 2024 88 12 0 0 DL,OO
Feb 2024 78 9 0 0 DL,OO
Jan 2024 95 13 0 0 DL,OO

ONT–SLC seasonal on-time pattern

Best: November (94.3%) · weakest: March (88.6%)

88%90%92%94%96% JanFebMarAprMayJunJulAugSepOctNovDec 89.5%

Strongest calendar month

November

94.3% on-time · ~100 flights/mo

Busiest calendar month

July

~123 flights/mo avg

Weakest calendar month

March

88.6% on-time · ~104 flights/mo

Cancellation Rate

0.9%

21 of 2,436 flights

Diversion Rate

0.0%

0 of 2,436 flights

Explore origin & destination

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

ONT - Ontario

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

ONT on-time profile

SLC - Salt Lake City

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

SLC on-time profile

Compare the two airports

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

Compare ONT vs SLC

Origin-hub reliability standing

Among ONT's stronger departures

ONT → SLC posts a 91.7% on-time rate, landing in the ≥85% band with 10 of 21 BTS-tracked routes leaving Ontario. The same hub also shows 9 mid-band and 2 challenged departures · fleet-wide on-time rank #57 of 4927 (highest on-time = #1).

What the Data Says About ONT to SLC

Ontario to Salt Lake City (ONT to SLC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 91.7% on-time rate across 7,786 flights, with delays that do happen averaging 94.6 minutes. The corridor runs roughly 558 miles and is served by 8 carriers. Over the most recent 24 months, 21 of 2,436 flights were cancelled (0.9%) and 0 diverted (0.0%).

The monthly split is wide on this route: Nov 2024 posted the strongest performance at 99% on-time, while Apr 2024 came in at just 82% - a 17-point swing worth factoring into travel timing.

On the multi-year calendar, ONT–SLC peaks in November at 94.3% on-time while July carries the heaviest traffic (~123 flights per month) ; the softest month is March at 88.6%, a 5.7-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does ONT to SLC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, ONT to SLC ranks #1601 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 ONT to SLC? ▼
Flights from Ontario to Salt Lake City have a 91.7% on-time rate based on 7,786 flights. The average delay is 94.6 minutes. The best recent month was Nov 2024 with 99% on-time.
What is the cancellation rate for ONT to SLC? ▼
Over the last 24 months, 0.9% of flights on this route were cancelled (21 of 2,436 flights) and 0.0% were diverted.
How far is the flight from ONT to SLC? ▼
The flight distance from Ontario (ONT) to Salt Lake City (SLC) is approximately 558 miles. This route is served by 8 carriers.
When is the best time to fly from ONT to SLC? ▼
The best recent month for on-time performance was Nov 2024 (99% on-time). The worst was Apr 2024 (82% on-time). Consider booking during months with historically better performance.

Airports on this route

ONT Airport

Ontario
SLC Airport

Salt Lake City
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 ONT–SLC data

ONT–SLC runs 12.7 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare ONT and SLC airport profiles: delay causes and top routes differ even on the same corridor. ONT airport
  • If your dates flex, November (94.3% on-time) beats March (88.6%) on this corridor. Seasonal chart
  • 4 other routes post a similar 91.7% 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.