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Route · SLC → SAN · 2020–2025 BTS data

Salt Lake City to San Diego

According to PlainFlights' route traffic ranking (BTS On-Time Performance total flights), SLC to SAN (Salt Lake City to San Diego) ranks #685 of 4927 tracked domestic routes by total flights (most flights = #1).

Data updated 2026-06-13

84%
On-time
+5 pts
vs US avg
64 min
Delay when late
14,238
Flights
#685 of 4927
Corpus placement

Cancelled

0.5%

Best Month

Apr 2024 90%

Worst Month

Sep 2024 74%

Distance

626 mi

Carriers

19

Monthly Performance

Recent 24 months of route data.

Period Flights Delayed Cancelled Diverted Carriers
Dec 2025 274 60 2 2 DL,WN,F9,OO
Nov 2025 268 44 7 2 OO,DL,F9,WN
Oct 2025 238 47 0 1 DL,OO,WN,F9
Sep 2025 180 20 2 1 WN,DL,F9
Aug 2025 208 39 0 0 OO,WN,F9,DL
Jul 2025 221 38 0 1 DL,OO,WN,F9
Jun 2025 215 41 0 0 DL,OO,WN,F9
May 2025 211 24 0 0 DL,OO,WN
Apr 2025 229 37 0 0 DL,OO,WN
Mar 2025 235 41 0 0 OO,WN,DL
Feb 2025 194 45 0 0 OO,WN,DL
Jan 2025 209 32 0 0 OO,WN,DL
Dec 2024 229 57 2 2 DL,OO,WN
Nov 2024 195 33 0 0 OO,WN,DL
Oct 2024 212 39 0 0 OO,WN,DL
Sep 2024 203 53 0 0 WN,OO,DL,NK
Aug 2024 240 57 3 1 DL,NK,WN,OO
Jul 2024 242 56 10 0 DL,NK,OO,WN
Jun 2024 221 53 0 3 DL,NK,OO,WN
May 2024 212 29 0 0 DL,OO,WN
Apr 2024 222 23 0 0 DL,OO,WN
Mar 2024 232 53 1 0 DL,OO,WN
Feb 2024 199 37 0 0 DL,OO,WN
Jan 2024 222 47 0 0 DL,WN,OO

SLC–SAN seasonal on-time pattern

Best: May (90.4%) · weakest: December (79.4%)

75%80%85%90%95% JanFebMarAprMayJunJulAugSepOctNovDec 79.4%

Strongest calendar month

May

90.4% on-time · ~185 flights/mo

Busiest calendar month

March

~225 flights/mo avg

Weakest calendar month

December

79.4% on-time · ~210 flights/mo

Cancellation Rate

0.5%

27 of 5,311 flights

Diversion Rate

0.2%

13 of 5,311 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

SAN - San Diego

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

SAN on-time profile

Compare the two airports

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

Compare SLC vs SAN

Origin-hub reliability standing

Mid-pack among SLC departures

From SLC, this corridor sits with 31 other 75–85% on-time routes out of 85 tracked departures, not the hub's reliability leaders (54 at ≥85%) and not the softest ( 0 below 75%). Destination: San Diego · fleet on-time rank #1592 of 4927.

What the Data Says About SLC to SAN

Bureau of Transportation Statistics records show Salt Lake City to San Diego (SLC to SAN) running a 84% on-time rate over 14,238 tracked flights, on the stronger end of a typical domestic pairing. When flights do run late, the average delay is 64.0 minutes. The 626-mile corridor is served by 19 carriers, and over the last 24 months 0.5% of 5,311 flights were cancelled, 0.2% diverted.

The monthly split is wide on this route: Apr 2024 posted the strongest performance at 90% on-time, while Sep 2024 came in at just 74% - a 16-point swing worth factoring into travel timing.

On the multi-year calendar, SLC–SAN peaks in May at 90.4% on-time while March carries the heaviest traffic (~225 flights per month) ; the softest month is December at 79.4%, a 11.0-point swing that repeats because the corridor's weather and holiday mix stays stable year to year.

Frequently Asked Questions

Where does SLC to SAN rank among US routes by traffic? ▼
According to PlainFlights' route traffic ranking, SLC to SAN ranks #685 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 SAN? ▼
Flights from Salt Lake City to San Diego have a 84% on-time rate based on 14,238 flights. The average delay is 64.0 minutes. The best recent month was Apr 2024 with 90% on-time.
What is the cancellation rate for SLC to SAN? ▼
Over the last 24 months, 0.5% of flights on this route were cancelled (27 of 5,311 flights) and 0.2% were diverted.
How far is the flight from SLC to SAN? ▼
The flight distance from Salt Lake City (SLC) to San Diego (SAN) is approximately 626 miles. This route is served by 19 carriers.
When is the best time to fly from SLC to SAN? ▼
The best recent month for on-time performance was Apr 2024 (90% on-time). The worst was Sep 2024 (74% on-time). Consider booking during months with historically better performance.

Airports on this route

SLC Airport

Salt Lake City
SAN Airport

San Diego
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–SAN data

SLC–SAN runs 5 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 SAN airport profiles: delay causes and top routes differ even on the same corridor. SLC airport
  • If your dates flex, May (90.4% on-time) beats December (79.4%) on this corridor. Seasonal chart
  • 4 other routes post a similar 84% 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.