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Route · SAN → SLC · 2020–2025 BTS data

San Diego to Salt Lake City

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SAN to SLC (San Diego to Salt Lake City) ranks #686 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

86.2%
On-time
+7.2 pts
vs US avg
73 min
Delay when late
14,228
Flights
#686 of 4927
Corpus placement

Cancelled

0.5%

Best Month

Apr 2024 88%

Worst Month

Jun 2024 76%

Distance

626 mi

Carriers

21

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 275 51 1 1 DL,WN,F9,OO
Nov 2025 268 42 5 0 OO,DL,F9,WN
Oct 2025 238 35 0 0 DL,OO,WN,F9
Sep 2025 180 24 2 0 WN,DL,F9
Aug 2025 208 36 0 0 OO,WN,F9,DL
Jul 2025 221 46 0 1 DL,OO,WN,F9
Jun 2025 215 42 0 0 DL,OO,WN,F9
May 2025 211 33 0 0 OO,WN,DL
Apr 2025 229 31 0 0 DL,OO,WN
Mar 2025 236 36 0 0 DL,OO,WN
Feb 2025 194 33 0 0 OO,WN,DL
Jan 2025 209 34 0 0 OO,WN,DL
Dec 2024 229 46 2 0 DL,OO,WN
Nov 2024 195 26 0 0 OO,WN,DL
Oct 2024 212 50 0 0 OO,WN,DL
Sep 2024 202 38 0 1 WN,OO,DL,NK
Aug 2024 241 39 3 1 DL,NK,WN,OO
Jul 2024 242 53 10 0 DL,NK,OO,WN
Jun 2024 220 52 0 0 DL,NK,OO,WN
May 2024 209 27 0 0 DL,OO,WN
Apr 2024 219 26 0 0 DL,OO,WN
Mar 2024 232 41 1 0 DL,OO,WN
Feb 2024 199 26 0 0 DL,OO,WN
Jan 2024 222 38 0 0 DL,WN,OO

SAN–SLC seasonal on-time pattern

Best: May (90.3%) · weakest: July (81.9%)

80%82%84%86%88%90%92% JanFebMarAprMayJunJulAugSepOctNovDec 82.7%

Strongest calendar month

May

90.3% on-time · ~184 flights/mo

Busiest calendar month

March

~225 flights/mo avg

Weakest calendar month

July

81.9% on-time · ~202 flights/mo

Cancellation Rate

0.5%

24 of 5,306 flights

Diversion Rate

0.1%

4 of 5,306 flights

Explore origin & destination

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

SAN - San Diego

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

SAN 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 SAN and SLC side by side on delays, cancellations, and reliability.

Compare SAN vs SLC

Origin-hub reliability standing

Among SAN's stronger departures

SAN → SLC posts a 86.2% on-time rate, landing in the ≥85% band with 13 of 51 BTS-tracked routes leaving San Diego. The same hub also shows 34 mid-band and 4 challenged departures · fleet-wide on-time rank #857 of 4927 (highest on-time = #1).

What the Data Says About SAN to SLC

San Diego to Salt Lake City (SAN to SLC) is one of the more dependable pairings in the BTS On-Time Performance dataset: a 86.2% on-time rate across 14,228 flights, with delays that do happen averaging 73.1 minutes. The corridor runs roughly 626 miles and is served by 21 carriers. Over the most recent 24 months, 24 of 5,306 flights were cancelled (0.5%) and 4 diverted (0.1%).

Monthly performance varies moderately here: Apr 2024 was the strongest month at 88% on-time versus Jun 2024 at 76%, a 12-point difference.

On the multi-year calendar, SAN–SLC peaks in May at 90.3% on-time while March carries the heaviest traffic (~225 flights per month) ; the softest month is July at 81.9%, a 8.4-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SAN to SLC rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SAN to SLC ranks #686 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 SAN to SLC? ▼
Flights from San Diego to Salt Lake City have a 86.2% on-time rate based on 14,228 flights. The average delay is 73.1 minutes. The best recent month was Apr 2024 with 88% on-time.
What is the cancellation rate for SAN to SLC? ▼
Over the last 24 months, 0.5% of flights on this route were cancelled (24 of 5,306 flights) and 0.1% were diverted.
How far is the flight from SAN to SLC? ▼
The flight distance from San Diego (SAN) to Salt Lake City (SLC) is approximately 626 miles. This route is served by 21 carriers.
When is the best time to fly from SAN to SLC? ▼
The best recent month for on-time performance was Apr 2024 (88% on-time). The worst was Jun 2024 (76% on-time). Consider booking during months with historically better performance.

Airports on this route

SAN Airport

San Diego
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 SAN–SLC data

SAN–SLC runs 7.2 pts above the national 79% average; the remaining risk is month-to-month swing and carrier mix, not a weak headline rate.

  • Compare SAN and SLC airport profiles: delay causes and top routes differ even on the same corridor. SAN airport
  • If your dates flex, May (90.3% on-time) beats July (81.9%) on this corridor. Seasonal chart
  • 4 other routes post a similar 86.2% 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.