Flight number record
DL 309
Delta Air Lines · Honolulu to Atlanta
- Route
- HNL → ATL
- Departs
- 16:50
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 309, check with Delta Air Lines.
DL 309 lands a B+, 3 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 a little over an hour on average. That rests on 365 flights, with a median arrival 6 minutes early.
Key figures
On time
79.8%
Arrivals under 15 minutes late, of 361 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
0.82%
National rate is 1.89%
1 hour+ late
5.8%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 6 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 309 flies
DL 309 flies HNL to ATL without a single fixed slot. Its most common scheduled departure was 16:50, used on 62 of 365 flights, with 17:00 (41 flights) next.
- Departs 16:5062 flights17.0%
- Departs 17:0041 flights11.2%
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 16:50 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 309 runs 8 points better at 79.8%. 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 309 next to HNL to ATL
Every carrier on HNL to ATL combined arrived on time 79.2% of the time across 383 flights, so DL 309 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 309 | 365 | 79.8% | 75 min | 0.82% | B+ |
| All Delta Air Lines on HNL–ATL | 383 | 79.2% | 74 min | 0.78% | B+ |
| All carriers on HNL–ATL | 383 | 79.2% | 74 min | 0.78% | B+ |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 309 quarter by quarter
DL 309 did not run the same all year. Its best quarter was Apr–Jun 2026 at 87.6% on time and its weakest Jan–Mar 2026 at 67.4%, a swing of 20 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 flights76.9%
- Jan–Mar 202690 flights67.4%
- Apr–Jun 202691 flights87.6%
- Jul–Sep 202662 flights87.1%
Scale runs 60% to 95%.
By weekday, DL 309 ranged from 75.0% on Wednesday to 84.3% on Saturday. With about 52 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late DL 309 runs when it is late
DL 309 often beats the schedule: 112 of 361 completed flights, 31%, arrived 15 minutes or more early. The 73 late arrivals split 32 under half an hour, 20 between 30 and 60 minutes, and 21 an hour or more.
- 15+ min early112 flights31.0%
- Within 15 min176 flights48.8%
- 15–29 min late32 flights8.9%
- 30–59 min late20 flights5.5%
- 1–2 hours late8 flights2.2%
- 2+ hours late13 flights3.6%
Scale runs 0% to 100%.
Share of 361 completed flights by arrival against schedule.
22 of 78 late departures made up the time and arrived on time, 28% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 309
The latest arrival of the period was on 24 January 2026, 6 hours 53 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 24 January 2026 | 6 hours 53 minutes | Late-arriving aircraft |
| 6 March 2026 | 5 hours 47 minutes | Late-arriving aircraft |
| 24 March 2026 | 5 hours 38 minutes | Late-arriving aircraft |
| 20 February 2026 | 5 hours 36 minutes | Late-arriving aircraft |
| 2 September 2025 | 4 hours 49 minutes | Carrier |
Delay causes
Why DL 309 runs late
Late-arriving aircraft accounts for 64% of the 5,487 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 20%Carrier
- 13%National Airspace System
- 2%Extreme weather
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,487 reported delay minutes here, that single category outweighs weather by 31 to one. The split is drawn from 5,487 delay minutes reported on DL 309.
Cancellations are rare at 0.82%, 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
5.8% 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 a little over an hour, which a normal layover absorbs.
At 4,502 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 309 in the data flew HNL to ATL. 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 309
For a booking, read DL 309 as 79.8% on time with 0.82% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- Daniel K. Inouye International (HNL) delay statistics
- Hartsfield-Jackson Atlanta International (ATL) 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.