Flight number record
DL 2311
Delta Air Lines · Los Angeles to Salt Lake City
- Route
- LAX → SLC
- Departs
- 17:05
- Flights
- 364
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2311, check with Delta Air Lines.
DL 2311 lands a B+, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 364 flights, with a median arrival 3 minutes early.
Key figures
On time
78.7%
Arrivals under 15 minutes late, of 362 completed flights
Avg delay
59 min
Across delayed arrivals only, not all flights
Cancelled
0.27%
National rate is 1.89%
1 hour+ late
7.7%
National rate is 8.3%
These figures cover 364 flights between September 2025 and August 2026. The median arrival is 3 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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Schedule
When DL 2311 flies
DL 2311 flies LAX to SLC without a single fixed slot. Its most common scheduled departure was 17:05, used on 75 of 364 flights, with 17:00 (73 flights) and 17:07 (65 flights) next.
- Departs 17:0575 flights20.6%
- Departs 17:0073 flights20.1%
- Departs 17:0765 flights17.9%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 17:05 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and DL 2311 runs 11 points better at 78.7%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
DL 2311 next to LAX to SLC
Every carrier on LAX to SLC combined arrived on time 87.2% of the time across 4,195 flights, so DL 2311 is 9 points behind it. Delta flew 2,457 flights on the same city pair under all its flight numbers, including this one, and those ran 88.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 2 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2311thin sample | 364 | 78.7% | 59 min | 0.27% | B+ |
| All Delta Air Lines on LAX–SLC | 2,457 | 88.4% | 80 min | 0.53% | A+ |
| All carriers on LAX–SLC | 4,195 | 87.2% | 72 min | 0.50% | A+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2311 quarter by quarter
DL 2311 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 71.0%, a swing of 22 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights78.7%
- Jan–Mar 202690 flights77.8%
- Apr–Jun 202691 flights80.2%
- Jul–Sep 202662 flights71.0%
Scale runs 65% to 100%.
By weekday, DL 2311 did best on Saturday at 92.2% on time and worst on Thursday at 66.7%. Each day rests on about 52 flights, so a gap of 26 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2311 runs when it is late
The 77 late arrivals split 32 under half an hour, 17 between 30 and 60 minutes, and 28 an hour or more.
- 15+ min early67 flights18.5%
- Within 15 min218 flights60.2%
- 15–29 min late32 flights8.8%
- 30–59 min late17 flights4.7%
- 1–2 hours late17 flights4.7%
- 2+ hours late11 flights3.0%
Scale runs 0% to 100%.
Share of 362 completed flights by arrival against schedule.
18 of 81 late departures made up the time and arrived on time, 22% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for DL 2311
The latest arrival of the period was on 26 April 2026, 3 hours 41 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 |
|---|---|---|
| 26 April 2026 | 3 hours 41 minutes | Carrier |
| 16 April 2026 | 3 hours 21 minutes | Carrier |
| 13 November 2025 | 2 hours 46 minutes | Carrier |
| 9 January 2026 | 2 hours 39 minutes | Carrier |
| 13 June 2026 | 2 hours 29 minutes | Carrier |
Delay causes
Why DL 2311 runs late
Carrier accounts for 55% of the 4,525 delay minutes carriers reported here, and the remaining four split what is left.
- 55%Carrier
- 37%Late-arriving aircraft
- 7%National Airspace System
- 1%Security
37% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,525 reported delay minutes here, that single category outweighs weather by 37 to one. The split is drawn from 4,525 delay minutes reported on DL 2311.
Cancellations are rare at 0.27%, below the national 1.89% 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
7.7% of arrivals land an hour or more late, close to the national 8.3%, so 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.
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: 9 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 1647 on the same route85.4%
- Delta Air Lines 1318 on the same route91.7%
- Delta Air Lines 1194 on the same route88.5%
- Delta Air Lines 1434 on the same route92.0%
- Delta Air Lines 2906 on the same route95.4%
- Delta Air Lines 1483 on the same route86.6%
- 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.