Flight number record
DL 2311
Delta Air Lines · Los Angeles to Salt Lake City
- Route
- LAX → SLC
- Departs
- 17:10
- Flights
- 364
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2311, check with Delta Air Lines.
DL 2311 lands a B+, level with the national rate of 77.6%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 364 flights, with a median arrival 3 minutes early.
Key figures
On time
77.9%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
60 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.81%
1 hour+ late
8.6%
National rate is 8.1%
These figures cover 364 flights between July 2025 and June 2026. Beyond the headline rate, 8.6% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When DL 2311 flies
DL 2311 flies LAX to SLC without a single fixed slot. Its most common scheduled departure was 17:10, used on 90 of 364 flights, with 17:00 (72 flights) and 17:09 (59 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 17:1090 flights24.7%
- Departs 17:0072 flights19.8%
- Departs 17:0959 flights16.2%
Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:10 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and DL 2311 runs 10 points better at 77.9%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
Against the route
DL 2311 next to LAX to SLC
Every carrier on LAX to SLC combined arrived on time 87.7% of the time across 4,144 flights, so DL 2311 is 10 points behind it. Delta flew 2,451 flights on the same city pair under all its flight numbers, including this one, and those ran 88.5% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 4 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2311thin sample | 364 | 77.9% | 60 min | 0.27% | B+ |
| All Delta Air Lines on LAX–SLC | 2,451 | 88.5% | 79 min | 0.41% | A+ |
| All carriers on LAX–SLC | 4,144 | 87.7% | 75 min | 0.41% | A+ |
| Delta Air Lines, whole network | 1,038,570 | 81.6% | 71 min | 1.62% | B |
Across the year
DL 2311 quarter by quarter
Quarter by quarter DL 2311 held fairly steady: 75.0% in Jul–Sep 2025, 78.7% in Oct–Dec 2025, 77.8% in Jan–Mar 2026 and 80.2% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202592 flights75.0%
- Oct–Dec 202591 flights78.7%
- Jan–Mar 202690 flights77.8%
- Apr–Jun 202691 flights80.2%
Scale runs 65% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2311 did best on Tuesday at 88.7% on time and worst on Wednesday at 69.2%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Delay causes
Why DL 2311 runs late
One category carries most of the weight here. Carrier accounts for 59% of the 4,822 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 59%Carrier
- 36%Late-arriving aircraft
- 4%National Airspace System
- 1%Security
36% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 4,822 reported delay minutes here, that single category outweighs weather by 36 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 4,822 delay minutes reported on DL 2311.
Cancellations are rare at 0.27%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
8.6% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
The 590 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
Every one of the 364 flights under DL 2311 in the data flew LAX to SLC. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 364 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 DL 2311
For a booking, DL 2311 is one of the weaker ways to fly LAX to SLC: 10 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- LAX to SLC, every carrier and departure
- SLC to LAX, the return direction
- Delta Air Lines 1434 on the same route92.5%
- Delta Air Lines 1647 on the same route85.9%
- Delta Air Lines 1194 on the same route90.1%
- Delta Air Lines 1318 on the same route91.2%
- Delta Air Lines 2906 on the same route95.7%
- Delta Air Lines 1483 on the same route85.4%
- Los Angeles International (LAX) delay statistics
- Salt Lake City International (SLC) delay statistics
- Delta Air Lines on-time record
- Every Delta Air Lines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means Delta Air Lines’s own number as it reports to the DOT. How the figures are computed is on the methodology page.
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.