Flight number record

DL 2039

Delta Air Lines · Chicago to Detroit

Route: ORD → DTW
Departs: 07:10
Flights: 349
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s DL 2039, check with Delta Air Lines.

DL 2039 earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs close to two hours. That rests on 349 flights, with a median arrival 10 minutes early.

Set against the rest of the country, DL 2039's record is 8 points better than the US average of 77.6%. That gap is worth roughly 82 fewer late arrivals for every thousand flights.

On time

85.8%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

110 min

Across delayed arrivals only, not all flights

Cancelled

2.87%

National rate is 1.81%

1 hour+ late

7.1%

National rate is 8.1%

These figures cover 349 flights between July 2025 and June 2026. The median arrival is 10 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.

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 130 of 349 flights, with 07:00 (55 flights) and 06:45 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:10130 flights37.2%
Departs 07:0055 flights15.8%
Departs 06:4541 flights11.7%

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 07:10 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 4 points worse at 85.8%. 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 2039 next to ORD to DTW

Every carrier on ORD to DTW combined arrived on time 70.6% of the time across 5,956 flights, so DL 2039 is 15 points ahead of it. Delta flew 1,258 flights on the same city pair under all its flight numbers, including this one, and those ran 76.7% on time. Across its whole network Delta Air Lines managed 81.6%, which this flight beats by 4 points.

DL 2039 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
DL 2039thin sample	349	85.8%	110 min	2.87%	A
All Delta Air Lines on ORD–DTW	1,258	76.7%	88 min	2.54%	B
All carriers on ORD–DTW	5,956	70.6%	83 min	3.04%	C−
Delta Air Lines, whole network	1,038,570	81.6%	71 min	1.62%	B

Across the year

DL 2039 quarter by quarter

Quarter by quarter DL 2039 held fairly steady: 84.6% in Jul–Sep 2025, 84.6% in Oct–Dec 2025, 84.1% in Jan–Mar 2026 and 89.8% in Apr–Jun 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 202592 flights84.6%
Oct–Dec 202580 flights84.6%
Jan–Mar 202686 flights84.1%
Apr–Jun 202691 flights89.8%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, DL 2039 did best on Wednesday at 97.9% on time and worst on Sunday at 72.9%. Each day rests on about 50 flights, so a gap of 25 points is worth noticing but could still narrow in another year.

Delay causes

Why DL 2039 runs late

One category carries most of the weight here. Carrier accounts for 80% of the 5,262 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
80%
National Airspace System
10%
Late-arriving aircraft
7%
Extreme weather
3%

The largest share of delay minutes, 80%, 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 4,205 of the 5,262 delay minutes reported here. The split is drawn from 5,262 delay minutes reported on DL 2039.

Cancellations run at 2.87%, against 1.81% nationally. That is roughly 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

7.1% 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 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: 2.87% 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.

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