Flight number record

DL 2231

Delta Air Lines · Chicago to Salt Lake City

Route: ORD → SLC
Departs: 07:20
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2231, check with Delta Air Lines.

DL 2231 lands a B, about a point 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 close to two hours on average. That is a workable record, not a spotless one. That rests on 365 flights, with a median arrival 1 minute early.

On time

78.9%

Arrivals under 15 minutes late, of 361 completed flights

Avg delay

107 min

Across delayed arrivals only, not all flights

Cancelled

1.10%

National rate is 1.81%

1 hour+ late

8.3%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When DL 2231 flies

DL 2231 flies ORD to SLC without a single fixed slot. Its most common scheduled departure was 07:20, used on 115 of 365 flights, with 07:45 (86 flights) and 07:50 (69 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:20115 flights31.5%
Departs 07:4586 flights23.6%
Departs 07:5069 flights18.9%

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 07:20 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2231 runs 10 points worse at 78.9%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

DL 2231 next to ORD to SLC

Every carrier on ORD to SLC combined arrived on time 68.8% of the time across 3,198 flights, so DL 2231 is 10 points ahead of it. Delta flew 1,011 flights on the same city pair under all its flight numbers, including this one, and those ran 71.8% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight trails by 3 points.

DL 2231 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2231	365	78.9%	107 min	1.10%	B
All Delta Air Lines on ORD–SLC	1,011	71.8%	105 min	0.79%	C+
All carriers on ORD–SLC	3,198	68.8%	79 min	1.16%	C
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2231 quarter by quarter

DL 2231 did not run the same all year. Its best quarter was Apr–Jun 2026 at 86.8% on time and its weakest Jan–Mar 2026 at 74.7%, a swing of 12 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 flights79.3%
Oct–Dec 202592 flights74.7%
Jan–Mar 202690 flights74.7%
Apr–Jun 202691 flights86.8%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2231 ranged from 72.5% on Monday to 82.7% on Thursday. 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.

Delay causes

Why DL 2231 runs late

One category carries most of the weight here. Carrier accounts for 67% of the 8,124 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
67%
Late-arriving aircraft
15%
National Airspace System
14%
Extreme weather
4%

The largest share of delay minutes, 67%, 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 5,425 of the 8,124 delay minutes reported here. The split is drawn from 8,124 delay minutes reported on DL 2231.

Cancellations sit at 1.10% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

8.3% 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 close to two hours, which a normal layover absorbs.

The 1,250 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

Every one of the 365 flights under DL 2231 in the data flew ORD 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 2231

For a booking, read DL 2231 as 78.9% on time with 1.10% 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