Carrier route record
DLLGB→SLC
Delta Air Lines · Long Beach to Salt Lake City
- Flights
- 529
- Period
- September 2025 to August 2026
- Share of route
- 34%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Delta Air Lines.
Delta on LGB to SLC earns an A. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs an hour and a half. That rests on 529 flights. The strongest carrier on the route with a full sample, SkyWest Airlines, flew 560 at 92.1% on time.
Set against the rest of the country, Delta's LGB to SLC record is 11 points better than the US average of 77.3%. That gap is worth roughly 110 fewer late arrivals for every thousand flights.
Key figures
On time
88.3%
Arrivals under 15 minutes late, of 521 completed flights
Avg delay
90 min
Across delayed arrivals only, not all flights
Cancelled
1.13%
National rate is 1.89%
Whole route
88.7%
Every carrier on LGB to SLC, 1,569 flights
These figures cover 529 flights between September 2025 and August 2026. The median arrival is 12 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Delta against every carrier on LGB to SLC
Delta flew 529 of the 1,569 flights on LGB to SLC, about 34% of it. Its 88.3% on time is about level with the route as a whole at 88.7%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from SkyWest at 92.1% to Southwest at 85.1%.
The choice of carrier is not cosmetic here. SkyWest Airlines arrives on time 92.1% of the time; Southwest Airlines manages 85.1%. Sample sizes sit next to every figure, because a two-point gap across 480 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SkyWest Airlines | 560 | 92.1% | 91 min | 0.00% | A+ |
| Delta Air Lines (this page) | 529 | 88.3% | 90 min | 1.13% | A |
| Southwest Airlines | 480 | 85.1% | 51 min | 0.21% | A+ |
SkyWest leads Southwest by 7 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Flight by flight
Delta flight numbers on LGB to SLC
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When Delta runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 529 flights.
- 5am–8am164 flights90.7%
- 8am–11am—
- 11am–2pm365 flights87.2%
- 2pm–5pm—
- 5pm–8pm—
- 8pm–5am—
Scale runs 80% to 95%. Rows with fewer than 30 flights show a dash.
The 5am–8am window is the strongest at 90.7% on time. The full set of windows spans 4 points.
Across the year
Delta on LGB to SLC through the year
September is the best month on the calendar at 100.0% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. July was the busiest month here, with 62 flights.
Across the week, Friday is the strongest day at 93.4% on time and Thursday the weakest at 84.2%, a spread of 9 points.
Arrival by arrival
How late Delta on LGB to SLC runs when it is late
Delta on LGB to SLC often beats the schedule: 207 of 521 completed flights, 40%, arrived 15 minutes or more early. The 61 late arrivals split 23 under half an hour, 13 between 30 and 60 minutes, and 25 an hour or more.
- 15+ min early207 flights39.7%
- Within 15 min253 flights48.6%
- 15–29 min late23 flights4.4%
- 30–59 min late13 flights2.5%
- 1–2 hours late12 flights2.3%
- 2+ hours late13 flights2.5%
Scale runs 0% to 100%.
Share of 521 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 60 departures that left 15 minutes late or more, only 5 made it up before arrival. Only 6 left on time and still arrived late.
The worst days
Worst days for Delta on LGB to SLC
The latest arrival of the period was on 4 April 2026, 18 hours 8 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 April 2026 | 18 hours 8 minutes | Carrier |
| 30 October 2025 | 7 hours 14 minutes | Carrier |
| 22 March 2026 | 3 hours 56 minutes | Carrier |
| 10 June 2026 | 3 hours 35 minutes | Carrier |
| 1 April 2026 | 3 hours 31 minutes | Carrier |
Delay causes
Why Delta runs late on this route
Carrier accounts for 98% of the 5,489 delay minutes carriers reported here, and the remaining four split what is left.
- 98%Carrier
- 2%National Airspace System
- 0%Late-arriving aircraft
The largest share of delay minutes, 98%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,369 of the 5,489 delay minutes reported here. The split is drawn from 5,489 reported delay minutes.
Cancellations sit at 1.13% against a national 1.89%, which is ordinary. Diversions add another 0.38%.
Connections and stage length
What a delay here costs
Badly late arrivals are rare here: only 4.8% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 588 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 88.2% on time across 530 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 529 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking Delta on LGB to SLC
Put together: treat all of this as provisional. 529 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 88.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 521 completed flights over 12 months sit behind that.
Related
Where to go next
- LGB to SLC, every carrier
- Delta on SLC to LGB, the return leg
- SkyWest Airlines on LGB to SLC92.1%
- Southwest Airlines on LGB to SLC85.1%
- Delta Air Lines network-wide record
- Salt Lake City International (SLC) delay statistics
- Worst months to fly in the US, ranked by the data
- How to read this site: grades, sample sizes, and honest caveats
Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.