Flight number record
DL 2231
Delta Air Lines · Chicago to Salt Lake City
- Route
- ORD → SLC
- Departs
- 07:20
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2231, check with Delta Air Lines.
DL 2231 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 close to two hours on average. That rests on 365 flights, with a median arrival 3 minutes early.
Key figures
On time
80.0%
Arrivals under 15 minutes late, of 360 completed flights
Avg delay
112 min
Across delayed arrivals only, not all flights
Cancelled
1.37%
National rate is 1.89%
1 hour+ late
8.3%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. Beyond the headline rate, 8.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 (98 flights) next.
- Departs 07:20115 flights31.5%
- Departs 07:4598 flights26.8%
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 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 9 points worse at 80.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
DL 2231 next to ORD to SLC
Every carrier on ORD to SLC combined arrived on time 68.6% of the time across 3,245 flights, so DL 2231 is 11 points ahead of it. Delta flew 1,014 flights on the same city pair under all its flight numbers, including this one, and those ran 70.4% on time. 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 2231 | 365 | 80.0% | 112 min | 1.37% | B |
| All Delta Air Lines on ORD–SLC | 1,014 | 70.4% | 109 min | 1.18% | C |
| All carriers on ORD–SLC | 3,245 | 68.6% | 81 min | 1.39% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2231 quarter by quarter
DL 2231 did not run the same all year. Its best quarter was Jul–Sep 2025 at 90.0% on time and its weakest Jan–Mar 2026 at 74.7%, a swing of 15 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 flights90.0%
- Oct–Dec 202592 flights74.7%
- Jan–Mar 202690 flights74.7%
- Apr–Jun 202691 flights86.8%
- Jul–Sep 202662 flights80.3%
Scale runs 65% to 95%.
By weekday, DL 2231 ranged from 76.0% on Sunday to 84.6% on Thursday. 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 2231 runs when it is late
The 72 late arrivals split 20 under half an hour, 22 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early62 flights17.2%
- Within 15 min226 flights62.8%
- 15–29 min late20 flights5.6%
- 30–59 min late22 flights6.1%
- 1–2 hours late13 flights3.6%
- 2+ hours late17 flights4.7%
Scale runs 0% to 100%.
Share of 360 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 60 departures that left 15 minutes late or more, only 5 made it up before arrival. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 2231
The latest arrival of the period was on 30 March 2026, 16 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 30 March 2026 | 16 hours 30 minutes | Carrier |
| 11 March 2026 | 9 hours 45 minutes | Carrier |
| 30 November 2025 | 8 hours 46 minutes | Late-arriving aircraft |
| 4 April 2026 | 5 hours 45 minutes | Carrier |
| 21 December 2025 | 5 hours 37 minutes | Carrier |
Delay causes
Why DL 2231 runs late
Carrier accounts for 67% of the 8,058 delay minutes carriers reported here, and the remaining four split what is left.
- 67%Carrier
- 15%Late-arriving aircraft
- 13%National Airspace System
- 5%Extreme weather
The largest share of delay minutes, 67%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 5,386 of the 8,058 delay minutes reported here. The split is drawn from 8,058 delay minutes reported on DL 2231.
Cancellations sit at 1.37% against a national 1.89%, 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 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last 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.
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 80.0% on time with 1.37% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to SLC, every carrier and departure
- SLC to ORD, the return direction
- Chicago O'Hare International (ORD) 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
- The best time of day to fly, according to 7.05 million flight records
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.