Flight number record
DL 1063
Delta Air Lines · Atlanta to Chicago
- Route
- ATL → MDW
- Departs
- 08:59
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s DL 1063, check with Delta Air Lines.
DL 1063 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 77.3%. When something does go wrong the average delay runs roughly 45 minutes. That rests on 365 flights, with a median arrival 7 minutes early.
Set against the rest of the country, DL 1063's record is 8 points better than the US average of 77.3%. That gap is worth roughly 83 fewer late arrivals for every thousand flights.
Key figures
On time
85.6%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
43 min
Across delayed arrivals only, not all flights
Cancelled
2.74%
National rate is 1.89%
1 hour+ late
3.7%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 2026. The median arrival is 7 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 1063 flies
DL 1063 flies ATL to MDW without a single fixed slot. Its most common scheduled departure was 08:59, used on 59 of 365 flights, with 09:09 (57 flights) and 08:55 (56 flights) next.
- Departs 08:5959 flights16.2%
- Departs 09:0957 flights15.6%
- Departs 08:5556 flights15.3%
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 08:59 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and DL 1063 runs level with that at 85.6%. 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 1063 next to ATL to MDW
Every carrier on ATL to MDW combined arrived on time 75.2% of the time across 3,537 flights, so DL 1063 is 10 points ahead of it. Delta flew 1,359 flights on the same city pair under all its flight numbers, including this one, and those ran 81.9% on time. Across its whole network Delta Air Lines managed 81.1%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| DL 1063 | 365 | 85.6% | 43 min | 2.74% | A |
| All Delta Air Lines on ATL–MDW | 1,359 | 81.9% | 56 min | 2.35% | B |
| All carriers on ATL–MDW | 3,537 | 75.2% | 67 min | 2.04% | B |
| Delta Air Lines, whole network | 1,039,517 | 81.1% | 71 min | 1.74% | B |
Across the year
DL 1063 quarter by quarter
DL 1063 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Jul–Sep 2026 at 80.0%, a swing of 13 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 flights93.3%
- Oct–Dec 202592 flights84.1%
- Jan–Mar 202690 flights85.9%
- Apr–Jun 202691 flights87.8%
- Jul–Sep 202662 flights80.0%
Scale runs 70% to 100%.
By weekday, DL 1063 did best on Tuesday at 94.1% on time and worst on Sunday at 79.6%. Each day rests on about 52 flights, so a gap of 15 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late DL 1063 runs when it is late
Most of the lateness is short. 26 of the 51 late arrivals were under half an hour behind, and 13 reached an hour or more.
- 15+ min early85 flights24.1%
- Within 15 min217 flights61.5%
- 15–29 min late26 flights7.4%
- 30–59 min late12 flights3.4%
- 1–2 hours late10 flights2.8%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
13 of 47 late departures made up the time and arrived on time, 28% of them. 17 flights left on time and still arrived late.
The worst days
Worst days for DL 1063
The latest arrival of the period was on 17 October 2025, 2 hours 41 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 October 2025 | 2 hours 41 minutes | Carrier |
| 5 January 2026 | 2 hours 25 minutes | Late-arriving aircraft |
| 13 September 2025 | 2 hours | National Airspace System |
| 19 November 2025 | 1 hour 27 minutes | Carrier |
| 13 October 2025 | 1 hour 23 minutes | Carrier |
Delay causes
Why DL 1063 runs late
Carrier accounts for 47% of the 2,188 delay minutes carriers reported here, and the remaining four split what is left.
- 47%Carrier
- 26%National Airspace System
- 22%Late-arriving aircraft
- 5%Extreme weather
The largest share of delay minutes, 47%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 1,025 of the 2,188 delay minutes reported here. The split is drawn from 2,188 delay minutes reported on DL 1063.
Cancellations run at 2.74%, against 1.89% nationally. That is roughly one flight in 40 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
Badly late arrivals are rare here: only 3.7% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 591 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.
DL 1063 is not only a ATL to MDW flight. It also flew MDW to ATL (365 flights, 88.1% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.
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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| MDW to ATL | 365 | 88.1% | 79 min | 2.47% | A |
What to do with this
Booking DL 1063
For a booking, the cancellation rate is the figure to plan around on DL 1063: 2.74% of its 365 scheduled flights did not operate. A late arrival costs roughly 45 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ATL to MDW, every carrier and departure
- MDW to ATL, the return direction
- Delta Air Lines 1076 on the same route77.1%
- Frontier Airlines 2779 on the same route64.5%
- Frontier Airlines 2291 on the same route64.5%
- Delta Air Lines 2417 on the same route87.3%
- Hartsfield-Jackson Atlanta International (ATL) delay statistics
- Chicago Midway International (MDW) 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.