Flight number record

DL 311

Delta Air Lines · Los Angeles to Kailua-Kona

Route: LAX → KOA
Departs: 16:29
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. About 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 365 flights, with a median arrival 8 minutes early.

On time

81.1%

Arrivals under 15 minutes late, of 360 completed flights

Avg delay

56 min

Across delayed arrivals only, not all flights

Cancelled

1.37%

National rate is 1.81%

1 hour+ late

6.1%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 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.

Schedule

When DL 311 flies

DL 311 flies LAX to KOA without a single fixed slot. Its most common scheduled departure was 16:29, used on 72 of 365 flights, with 14:37 (62 flights) and 14:59 (60 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 16:2972 flights19.7%
Departs 14:3762 flights17.0%
Departs 14:5960 flights16.4%

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 16:29 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, 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.

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 1,606 flights, so DL 311 is about level with it. Across its whole network Delta Air Lines managed 81.6%, close to this flight's figure.

DL 311 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 311	365	81.1%	56 min	1.37%	B
All Delta Air Lines on LAX–KOA	365	81.1%	56 min	1.37%	B
All carriers on LAX–KOA	1,606	81.8%	50 min	0.87%	B+
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 311 quarter by quarter

DL 311 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.1% on time and its weakest Oct–Dec 2025 at 75.0%, a swing of 15 points on roughly 91 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 202592 flights90.1%
Oct–Dec 202592 flights75.0%
Jan–Mar 202690 flights77.9%
Apr–Jun 202691 flights81.3%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 311 ranged from 78.4% on Saturday to 86.3% on Monday. With about 52 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why DL 311 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 3,777 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.

Carrier
65%
Late-arriving aircraft
23%
National Airspace System
13%

The largest share of delay minutes, 65%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,439 of the 3,777 delay minutes reported here. The split is drawn from 3,777 delay minutes reported on DL 311.

Cancellations sit at 1.37% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

6.1% 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.

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.

Where to go next

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.

Key figures