Flight number record
DL 311
Delta Air Lines · Los Angeles to Kailua-Kona
- Route
- LAX → KOA
- Departs
- 16:44
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 311, check with Delta Air Lines.
DL 311 lands a B, 4 points 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 365 flights, with a median arrival 8 minutes early.
Key figures
On time
81.1%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
58 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
6.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 8 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 311 flies
DL 311 flies LAX to KOA without a single fixed slot. Its most common scheduled departure was 16:44, used on 86 of 365 flights, with 14:37 (62 flights) and 14:59 (60 flights) next.
- Departs 16:4486 flights23.6%
- Departs 14:3762 flights17.0%
- Departs 14:5960 flights16.4%
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 16:44 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 311 runs 9 points better at 81.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
DL 311 next to LAX to KOA
Every carrier on LAX to KOA combined arrived on time 81.8% of the time across 1,601 flights, so DL 311 is about level with it. Across its whole network Delta Air Lines managed 81.1%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 311 | 365 | 81.1% | 58 min | 1.37% | B |
| All Delta Air Lines on LAX–KOA | 365 | 81.1% | 58 min | 1.37% | B |
| All carriers on LAX–KOA | 1,601 | 81.8% | 52 min | 0.94% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 311 quarter by quarter
DL 311 did not run the same all year. Its best quarter was Jul–Sep 2026 at 91.8% on time and its weakest Oct–Dec 2025 at 75.0%, a swing of 17 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 flights86.7%
- Oct–Dec 202592 flights75.0%
- Jan–Mar 202690 flights77.9%
- Apr–Jun 202691 flights81.3%
- Jul–Sep 202662 flights91.8%
Scale runs 65% to 95%.
By weekday, DL 311 ranged from 76.9% on Wednesday to 86.5% on Monday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 311 runs when it is late
DL 311 often beats the schedule: 116 of 360 completed flights, 32%, arrived 15 minutes or more early. The 68 late arrivals split 22 under half an hour, 23 between 30 and 60 minutes, and 23 an hour or more.
- 15+ min early116 flights32.2%
- Within 15 min176 flights48.9%
- 15–29 min late22 flights6.1%
- 30–59 min late23 flights6.4%
- 1–2 hours late16 flights4.4%
- 2+ hours late7 flights1.9%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
19 of 78 late departures made up the time and arrived on time, 24% of them. 9 flights left on time and still arrived late.
The worst days
Worst days for DL 311
The latest arrival of the period was on 22 April 2026, 4 hours 34 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 22 April 2026 | 4 hours 34 minutes | Carrier |
| 20 December 2025 | 4 hours 12 minutes | Carrier |
| 5 August 2026 | 3 hours 8 minutes | Carrier |
| 25 February 2026 | 2 hours 8 minutes | Late-arriving aircraft |
| 6 May 2026 | 2 hours 8 minutes | Late-arriving aircraft |
Delay causes
Why DL 311 runs late
Carrier accounts for 66% of the 3,974 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Carrier
- 22%Late-arriving aircraft
- 12%National Airspace System
The largest share of delay minutes, 66%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 2,638 of the 3,974 delay minutes reported here. The split is drawn from 3,974 delay minutes reported on DL 311.
Cancellations sit at 1.37% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
6.4% 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.
At 2,504 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
Every one of the 365 flights under DL 311 in the data flew LAX to KOA. 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. 365 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 311
For a booking, read DL 311 as 81.1% on time with 1.37% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to KOA, every carrier and departure
- KOA to LAX, the return direction
- United Airlines 2373 on the same route90.6%
- Alaska Airlines 560 on the same route80.2%
- American Airlines 59 on the same route77.0%
- Los Angeles International (LAX) 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
- Worst months to fly in the US, ranked by the data
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.