Flight number record
DL 397
Delta Air Lines · Kahului to Salt Lake City
- Route
- OGG → SLC
- Departs
- 20:05
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 397, check with Delta Air Lines.
DL 397 earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 299 flights, with a median arrival 10 minutes early.
Set against the rest of the country, DL 397's record is 11 points better than the US average of 77.3%. That gap is worth roughly 107 fewer late arrivals for every thousand flights.
Key figures
On time
88.0%
Arrivals under 15 minutes late, of 283 completed flights
Avg delay
70 min
Across delayed arrivals only, not all flights
Cancelled
5.35%
National rate is 1.89%
1 hour+ late
3.2%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. The median arrival is 10 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 397 flies
DL 397 flies OGG to SLC without a single fixed slot. Its most common scheduled departure was 20:05, used on 66 of 299 flights, with 21:05 (62 flights) and 20:08 (56 flights) next.
- Departs 20:0566 flights22.1%
- Departs 21:0562 flights20.7%
- Departs 20:0856 flights18.7%
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 20:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and DL 397 runs 18 points better at 88.0%. 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 397 next to OGG to SLC
Every carrier on OGG to SLC combined arrived on time 87.3% of the time across 334 flights, so DL 397 is about level with it. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 397thin sample | 299 | 88.0% | 70 min | 5.35% | A− |
| All Delta Air Lines on OGG–SLCthin sample | 334 | 87.3% | 69 min | 5.39% | A− |
| All carriers on OGG–SLCthin sample | 334 | 87.3% | 69 min | 5.39% | A− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 397 quarter by quarter
DL 397 did not run the same all year. Its best quarter was Jul–Sep 2026 at 96.7% on time and its weakest Oct–Dec 2025 at 80.7%, a swing of 16 points on roughly 75 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.
- Oct–Dec 202560 flights80.7%
- Jan–Mar 202686 flights81.2%
- Apr–Jun 202691 flights93.0%
- Jul–Sep 202662 flights96.7%
Scale runs 70% to 100%.
By weekday, DL 397 did best on Wednesday at 92.3% on time and worst on Monday at 79.5%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 397 runs when it is late
DL 397 often beats the schedule: 113 of 283 completed flights, 40%, arrived 15 minutes or more early. Most of the lateness is short. 18 of the 34 late arrivals were under half an hour behind, and 9 reached an hour or more.
- 15+ min early113 flights39.9%
- Within 15 min136 flights48.1%
- 15–29 min late18 flights6.4%
- 30–59 min late7 flights2.5%
- 1–2 hours late2 flights0.7%
- 2+ hours late7 flights2.5%
Scale runs 0% to 100%.
Share of 283 completed flights by arrival against schedule.
6 of 24 late departures made up the time and arrived on time, 25% of them. In the other direction, 16 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SLC.
The worst days
Worst days for DL 397
The latest arrival of the period was on 1 December 2025, 5 hours 55 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 |
|---|---|---|
| 1 December 2025 | 5 hours 55 minutes | Carrier |
| 30 March 2026 | 5 hours 9 minutes | Carrier |
| 24 November 2025 | 4 hours 33 minutes | Late-arriving aircraft |
| 8 January 2026 | 3 hours 17 minutes | Late-arriving aircraft |
| 9 November 2025 | 3 hours 10 minutes | Carrier |
Delay causes
Why DL 397 runs late
Carrier accounts for 61% of the 2,386 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Carrier
- 21%Late-arriving aircraft
- 18%National Airspace System
The largest share of delay minutes, 61%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,460 of the 2,386 delay minutes reported here. The split is drawn from 2,386 delay minutes reported on DL 397.
Cancellations run at 5.35%, against 1.89% nationally. That is about one flight in twenty cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.2% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
At 2,935 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.
The same number turns up on four other city pairs in the data, including SLC to OGG (139), TRI to ATL (25) and FAI to MSP (7), but none flew often enough under DL 397 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to OGG to SLC only.
One caution: this is a thin sample. 299 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 397
For a booking, the cancellation rate is the figure to plan around on DL 397: 5.35% of its 299 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- Kahului Airport (OGG) 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
- What a cancellation rate actually tells you (and what it hides)
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.