Flight number record
UA 630
United Airlines · Chicago to Madison
- Route
- ORD → MSN
- Departs
- 22:00
- Flights
- 308
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 630, check with United Airlines.
UA 630 draws a D. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is about an hour behind schedule. Build slack into anything you connect to. That rests on 308 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so UA 630 runs 18 points behind the country as a whole. Across a thousand flights that is about 183 extra late arrivals.
Key figures
On time
59.0%
Arrivals under 15 minutes late, of 300 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
2.60%
National rate is 1.89%
1 hour+ late
15.3%
National rate is 8.3%
These figures cover 308 flights between September 2025 and August 2026. Beyond the headline rate, 15.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When UA 630 flies
UA 630 flies ORD to MSN without a single fixed slot. Its most common scheduled departure was 22:00, used on 46 of 308 flights, with 20:00 (37 flights) and 19:35 (36 flights) next.
- Departs 22:0046 flights14.9%
- Departs 20:0037 flights12.0%
- Departs 19:3536 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 22:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and UA 630 runs 11 points worse at 59.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
UA 630 next to ORD to MSN
Every carrier on ORD to MSN combined arrived on time 71.0% of the time across 4,073 flights, so UA 630 is 12 points behind it. United flew 997 flights on the same city pair under all its flight numbers, including this one, and those ran 68.5% on time. Across its whole network United Airlines managed 78.8%, which this flight trails by 20 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 630thin sample | 308 | 59.0% | 65 min | 2.60% | D |
| All United Airlines on ORD–MSN | 997 | 68.5% | 71 min | 1.91% | C |
| All carriers on ORD–MSN | 4,073 | 71.0% | 82 min | 3.78% | C− |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 630 quarter by quarter
UA 630 did not run the same all year. Its best quarter was Jan–Mar 2026 at 64.2% on time and its weakest Jul–Sep 2026 at 54.2%, a swing of 10 points on roughly 62 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 flights56.7%
- Oct–Dec 202577 flights57.9%
- Jan–Mar 202684 flights64.2%
- Apr–Jun 202656 flights59.3%
- Jul–Sep 202661 flights54.2%
Scale runs 45% to 70%.
By weekday, UA 630 did best on Thursday at 67.5% on time and worst on Tuesday at 54.5%. Each day rests on about 44 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 630 runs when it is late
The 123 late arrivals split 39 under half an hour, 38 between 30 and 60 minutes, and 46 an hour or more.
- 15+ min early32 flights10.7%
- Within 15 min145 flights48.3%
- 15–29 min late39 flights13.0%
- 30–59 min late38 flights12.7%
- 1–2 hours late29 flights9.7%
- 2+ hours late17 flights5.7%
Scale runs 0% to 100%.
Share of 300 completed flights by arrival against schedule.
22 of 130 late departures made up the time and arrived on time, 17% of them. In the other direction, 15 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 MSN.
The worst days
Worst days for UA 630
The latest arrival of the period was on 29 November 2025, 6 hours 40 minutes behind schedule; most of its delay minutes were filed as extreme weather. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 29 November 2025 | 6 hours 40 minutes | Extreme weather |
| 31 March 2026 | 5 hours 44 minutes | Late-arriving aircraft |
| 14 April 2026 | 4 hours 25 minutes | Extreme weather |
| 11 August 2026 | 3 hours 50 minutes | Late-arriving aircraft |
| 30 January 2026 | 3 hours 42 minutes | Late-arriving aircraft |
Delay causes
Why UA 630 runs late
Late-arriving aircraft accounts for 58% of the 7,994 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Late-arriving aircraft
- 17%Carrier
- 14%National Airspace System
- 11%Extreme weather
58% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,994 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 7,994 delay minutes reported on UA 630.
Cancellations run at 2.60%, against 1.89% nationally. That is about 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
15.3% 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 same number turns up on eight other city pairs in the data, including RDU to ORD (134), PHX to ORD (58) and PBI to ORD (52), but none flew often enough under UA 630 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to MSN only.
One caution: this is a thin sample. 308 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 UA 630
For a booking, the cancellation rate is the figure to plan around on UA 630: 2.60% of its 308 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- ORD to MSN, every carrier and departure
- MSN to ORD, the return direction
- Chicago O'Hare International (ORD) delay statistics
- United Airlines on-time record
- Every United Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
A flight number here means United Airlines’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.