Flight number record
DL 2377
Delta Air Lines · Salt Lake City to Chicago
- Route
- SLC → ORD
- Departs
- 14:40
- Flights
- 285
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2377, check with Delta Air Lines.
DL 2377 sits in the middle of the pack with a C. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land about an hour behind schedule. That rests on 285 flights, with a median arrival 3 minutes early.
The national on-time rate over the same period is 77.3%, so DL 2377 runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.
Key figures
On time
68.2%
Arrivals under 15 minutes late, of 280 completed flights
Avg delay
62 min
Across delayed arrivals only, not all flights
Cancelled
1.40%
National rate is 1.89%
1 hour+ late
10.7%
National rate is 8.3%
These figures cover 285 flights between September 2025 and August 2026. Beyond the headline rate, 10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When DL 2377 flies
DL 2377 flies SLC to ORD without a single fixed slot. Its most common scheduled departure was 14:40, used on 63 of 285 flights, with 13:35 (32 flights) and 13:59 (31 flights) next.
- Departs 14:4063 flights22.1%
- Departs 13:3532 flights11.2%
- Departs 13:5931 flights10.9%
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 14:40 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and DL 2377 runs 4 points worse at 68.2%. 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 2377 next to SLC to ORD
Every carrier on SLC to ORD combined arrived on time 74.9% of the time across 3,246 flights, so DL 2377 is 7 points behind it. Delta flew 1,013 flights on the same city pair under all its flight numbers, including this one, and those ran 75.4% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight trails by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2377thin sample | 285 | 68.2% | 62 min | 1.40% | C |
| All Delta Air Lines on SLC–ORD | 1,013 | 75.4% | 68 min | 1.09% | B |
| All carriers on SLC–ORD | 3,246 | 74.9% | 94 min | 1.48% | C |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2377 quarter by quarter
DL 2377 did not run the same all year. Its best quarter was Jan–Mar 2026 at 81.8% on time and its weakest Apr–Jun 2026 at 60.0%, a swing of 22 points on roughly 71 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 202526 flights—
- Oct–Dec 202574 flights66.7%
- Jan–Mar 202655 flights81.8%
- Apr–Jun 202677 flights60.0%
- Jul–Sep 202653 flights61.5%
Scale runs 50% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, DL 2377 ranged from 63.4% on Wednesday to 73.8% on Tuesday. With about 41 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.
Arrival by arrival
How late DL 2377 runs when it is late
The 89 late arrivals split 28 under half an hour, 31 between 30 and 60 minutes, and 30 an hour or more.
- 15+ min early58 flights20.7%
- Within 15 min133 flights47.5%
- 15–29 min late28 flights10.0%
- 30–59 min late31 flights11.1%
- 1–2 hours late22 flights7.9%
- 2+ hours late8 flights2.9%
Scale runs 0% to 100%.
Share of 280 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 67 departures that left 15 minutes late or more, only 5 made it up before arrival. In the other direction, 27 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 ORD.
The worst days
Worst days for DL 2377
The latest arrival of the period was on 10 June 2026, 5 hours 54 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 June 2026 | 5 hours 54 minutes | National Airspace System |
| 11 June 2026 | 4 hours 52 minutes | National Airspace System |
| 31 August 2026 | 3 hours 54 minutes | National Airspace System |
| 6 March 2026 | 3 hours 24 minutes | National Airspace System |
| 15 March 2026 | 3 hours 23 minutes | National Airspace System |
Delay causes
Why DL 2377 runs late
National Airspace System accounts for 59% of the 5,542 delay minutes carriers reported here, and the remaining four split what is left.
- 59%National Airspace System
- 30%Carrier
- 8%Late-arriving aircraft
- 3%Extreme weather
59% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 3,252 minutes out of 5,542, against a national NAS share of 21%. The split is drawn from 5,542 delay minutes reported on DL 2377.
Cancellations sit at 1.40% against a national 1.89%, which is ordinary. Diversions add another 0.35%.
Connections and routes
What a delay on this flight costs
10.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
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.
The same number turns up on one other city pair in the data, including ORD to SLC (159), but none flew often enough under DL 2377 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to SLC to ORD only.
One caution: this is a thin sample. 285 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 2377
For a booking, DL 2377 is one of the weaker ways to fly SLC to ORD: 7 points below the route as a whole. If the schedule allows, compare it with the other departures listed on the route page before settling on this one.
Related
Where to go next
- SLC to ORD, every carrier and departure
- ORD to SLC, the return direction
- Delta Air Lines 2413 on the same route71.1%
- Delta Air Lines 2247 on the same route85.1%
- United Airlines 1382 on the same route74.3%
- United Airlines 1502 on the same route81.6%
- Salt Lake City International (SLC) delay statistics
- Chicago O'Hare International (ORD) 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.