Flight number record
DL 2039
Delta Air Lines · Chicago to Detroit
- Route
- ORD → DTW
- Departs
- 07:10
- Flights
- 349
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 2039, check with Delta Air Lines.
DL 2039 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 349 flights, with a median arrival 13 minutes early.
Set against the rest of the country, DL 2039's record is 10 points better than the US average of 77.3%. That gap is worth roughly 100 fewer late arrivals for every thousand flights.
Key figures
On time
87.3%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
113 min
Across delayed arrivals only, not all flights
Cancelled
3.15%
National rate is 1.89%
1 hour+ late
6.5%
National rate is 8.3%
These figures cover 349 flights between September 2025 and August 2026. The median arrival is 13 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 2039 flies
DL 2039 flies ORD to DTW without a single fixed slot. Its most common scheduled departure was 07:10, used on 95 of 349 flights, with 07:00 (55 flights) and 06:45 (41 flights) next.
- Departs 07:1095 flights27.2%
- Departs 07:0055 flights15.8%
- Departs 06:4541 flights11.7%
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 07:10 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and DL 2039 runs 2 points worse at 87.3%. 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 2039 next to ORD to DTW
Every carrier on ORD to DTW combined arrived on time 71.1% of the time across 6,013 flights, so DL 2039 is 16 points ahead of it. Delta flew 1,156 flights on the same city pair under all its flight numbers, including this one, and those ran 77.3% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 6 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 2039thin sample | 349 | 87.3% | 113 min | 3.15% | A− |
| All Delta Air Lines on ORD–DTW | 1,156 | 77.3% | 96 min | 3.20% | B− |
| All carriers on ORD–DTW | 6,013 | 71.1% | 85 min | 3.21% | C− |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 2039 quarter by quarter
Quarter by quarter DL 2039 held fairly steady: 86.7% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 84.1% in Jan–Mar 2026, 89.8% in Apr–Jun 2026 and 91.7% in Jul–Sep 2026. A spread of 8 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 202580 flights84.6%
- Jan–Mar 202686 flights84.1%
- Apr–Jun 202691 flights89.8%
- Jul–Sep 202662 flights91.7%
Scale runs 75% to 95%.
By weekday, DL 2039 did best on Wednesday at 95.8% on time and worst on Sunday at 77.1%. Each day rests on about 50 flights, so a gap of 19 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 2039 runs when it is late
DL 2039 often beats the schedule: 138 of 338 completed flights, 41%, arrived 15 minutes or more early. When DL 2039 is late it tends to be very late: 22 of its 43 late arrivals were an hour or more behind, and 11 were two hours or more.
- 15+ min early138 flights40.8%
- Within 15 min157 flights46.4%
- 15–29 min late9 flights2.7%
- 30–59 min late12 flights3.6%
- 1–2 hours late11 flights3.3%
- 2+ hours late11 flights3.3%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 40 departures that left 15 minutes late or more, only 4 made it up before arrival. 7 flights left on time and still arrived late.
The worst days
Worst days for DL 2039
The latest arrival of the period was on 15 March 2026, 9 hours 32 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.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 March 2026 | 9 hours 32 minutes | Carrier |
| 20 September 2025 | 8 hours 57 minutes | Carrier |
| 8 December 2025 | 5 hours 4 minutes | Carrier |
| 7 March 2026 | 4 hours 37 minutes | Carrier |
| 21 June 2026 | 4 hours 26 minutes | Carrier |
Delay causes
Why DL 2039 runs late
Carrier accounts for 86% of the 4,863 delay minutes carriers reported here, and the remaining four split what is left.
- 86%Carrier
- 8%National Airspace System
- 4%Extreme weather
- 2%Late-arriving aircraft
The largest share of delay minutes, 86%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 4,163 of the 4,863 delay minutes reported here. The split is drawn from 4,863 delay minutes reported on DL 2039.
Cancellations run at 3.15%, against 1.89% nationally. That is about one flight in 30 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
6.5% 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 same number turns up on one other city pair in the data, including DFW to LGA (16), but none flew often enough under DL 2039 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to DTW only.
One caution: this is a thin sample. 349 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 2039
For a booking, the cancellation rate is the figure to plan around on DL 2039: 3.15% of its 349 scheduled flights did not operate. A late arrival costs close to two hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ORD to DTW, every carrier and departure
- DTW to ORD, the return direction
- Chicago O'Hare International (ORD) delay statistics
- Detroit Metropolitan Wayne County (DTW) 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.