Flight number record

DL 830

Delta Air Lines · Atlanta to Salt Lake City

Route: ATL → SLC
Departs: 08:10
Flights: 365
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s DL 830, check with Delta Air Lines.

DL 830 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 about an hour. That rests on 365 flights, with a median arrival 6 minutes early.

Set against the rest of the country, DL 830's record is 11 points better than the US average of 77.3%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

87.8%

Arrivals under 15 minutes late, of 362 completed flights

Avg delay

59 min

Across delayed arrivals only, not all flights

Cancelled

0.82%

National rate is 1.89%

1 hour+ late

3.3%

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 830 flies

DL 830 flies ATL to SLC without a single fixed slot. Its most common scheduled departure was 08:10, used on 108 of 365 flights, with 08:05 (84 flights) and 08:15 (57 flights) next.

Departs 08:10108 flights29.6%
Departs 08:0584 flights23.0%
Departs 08:1557 flights15.6%

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 08:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 830 runs 4 points better at 87.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

DL 830 next to ATL to SLC

Every carrier on ATL to SLC combined arrived on time 82.7% of the time across 2,965 flights, so DL 830 is 5 points ahead of it. Delta flew 2,959 flights on the same city pair under all its flight numbers, including this one, and those ran 82.7% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 7 points.

DL 830 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 830	365	87.8%	59 min	0.82%	A+
All Delta Air Lines on ATL–SLC	2,959	82.7%	60 min	0.44%	B+
All carriers on ATL–SLC	2,965	82.7%	60 min	0.44%	B+
Delta Air Lines, whole network	1,039,517	81.1%	71 min	1.74%	B

Across the year

DL 830 quarter by quarter

Quarter by quarter DL 830 held fairly steady: 86.7% in Jul–Sep 2025, 84.8% in Oct–Dec 2025, 86.2% in Jan–Mar 2026, 91.2% in Apr–Jun 2026 and 90.3% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202530 flights86.7%
Oct–Dec 202592 flights84.8%
Jan–Mar 202690 flights86.2%
Apr–Jun 202691 flights91.2%
Jul–Sep 202662 flights90.3%

Scale runs 75% to 95%.

By weekday, DL 830 ranged from 84.3% on Saturday to 90.4% on Wednesday. With about 52 flights behind each day, a spread of 6 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late DL 830 runs when it is late

The 44 late arrivals split 18 under half an hour, 14 between 30 and 60 minutes, and 12 an hour or more.

15+ min early82 flights22.7%
Within 15 min236 flights65.2%
15–29 min late18 flights5.0%
30–59 min late14 flights3.9%
1–2 hours late5 flights1.4%
2+ hours late7 flights1.9%

Scale runs 0% to 100%.

Share of 362 completed flights by arrival against schedule.

A late pushback is often recovered here: of 48 departures that left 15 minutes late or more, 17 still arrived on time. 13 flights left on time and still arrived late.

The worst days

Worst days for DL 830

The latest arrival of the period was on 19 March 2026, 3 hours 48 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.

The latest arrivals of DL 830 in the period
Date	Arrived late by	Largest filed cause
19 March 2026	3 hours 48 minutes	Carrier
1 February 2026	2 hours 52 minutes	Carrier
24 April 2026	2 hours 51 minutes	Carrier
13 February 2026	2 hours 21 minutes	Carrier
16 March 2026	2 hours 20 minutes	Carrier

Delay causes

Why DL 830 runs late

Carrier accounts for 68% of the 2,574 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
68%
National Airspace System
22%
Late-arriving aircraft
7%
Extreme weather
2%

The largest share of delay minutes, 68%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,758 of the 2,574 delay minutes reported here. The split is drawn from 2,574 delay minutes reported on DL 830.

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

Badly late arrivals are rare here: only 3.3% 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 1,590 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 830 in the data flew ATL 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. 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 830

For a booking, DL 830 has one of the better records a US domestic flight can show: 87.8% on time and 0.82% cancelled. That is a base rate, not a promise about any single 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, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures