Flight number record
UA 623
United Airlines · New York to Chicago
- Route
- LGA → ORD
- Departs
- 09:10
- Flights
- 332
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 623, check with United Airlines.
UA 623 lands a B−, about a point better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 332 flights, with a median arrival 4 minutes early.
Key figures
On time
78.6%
Arrivals under 15 minutes late, of 318 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
3.61%
National rate is 1.89%
1 hour+ late
6.3%
National rate is 8.3%
These figures cover 332 flights between September 2025 and August 2026. The median arrival is 4 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 UA 623 flies
UA 623 flies LGA to ORD without a single fixed slot. Its most common scheduled departure was 09:10, used on 102 of 332 flights, with 09:15 (93 flights) and 08:05 (82 flights) next.
- Departs 09:10102 flights30.7%
- Departs 09:1593 flights28.0%
- Departs 08:0582 flights24.7%
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 09:10 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and UA 623 runs 5 points worse at 78.6%. 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
UA 623 next to LGA to ORD
Every carrier on LGA to ORD combined arrived on time 66.7% of the time across 11,630 flights, so UA 623 is 12 points ahead of it. United flew 4,671 flights on the same city pair under all its flight numbers, including this one, and those ran 65.4% on time. Across its whole network United Airlines managed 78.8%, close to this flight's figure.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 623thin sample | 332 | 78.6% | 63 min | 3.61% | B− |
| All United Airlines on LGA–ORD | 4,671 | 65.4% | 90 min | 4.24% | C− |
| All carriers on LGA–ORD | 11,630 | 66.7% | 89 min | 5.45% | C− |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 623 quarter by quarter
UA 623 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.3% on time and its weakest Oct–Dec 2025 at 69.2%, a swing of 24 points on roughly 66 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 202579 flights69.2%
- Jan–Mar 202680 flights81.9%
- Apr–Jun 202684 flights81.0%
- Jul–Sep 202659 flights75.9%
Scale runs 60% to 100%.
By weekday, UA 623 ranged from 72.0% on Sunday to 82.0% on Thursday. With about 47 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 UA 623 runs when it is late
The 68 late arrivals split 33 under half an hour, 15 between 30 and 60 minutes, and 20 an hour or more.
- 15+ min early61 flights19.2%
- Within 15 min189 flights59.4%
- 15–29 min late33 flights10.4%
- 30–59 min late15 flights4.7%
- 1–2 hours late10 flights3.1%
- 2+ hours late10 flights3.1%
Scale runs 0% to 100%.
Share of 318 completed flights by arrival against schedule.
8 of 34 late departures made up the time and arrived on time, 24% of them. In the other direction, 42 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 UA 623
The latest arrival of the period was on 4 October 2025, 6 hours 24 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across October, September, July, November and April, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 4 October 2025 | 6 hours 24 minutes | Late-arriving aircraft |
| 13 September 2025 | 4 hours 9 minutes | Extreme weather |
| 19 July 2026 | 3 hours 52 minutes | Late-arriving aircraft |
| 10 November 2025 | 3 hours 46 minutes | National Airspace System |
| 8 April 2026 | 3 hours 40 minutes | Carrier |
Delay causes
Why UA 623 runs late
National Airspace System accounts for 58% of the 4,299 delay minutes carriers reported here, and the remaining four split what is left.
- 58%National Airspace System
- 16%Late-arriving aircraft
- 15%Carrier
- 11%Extreme weather
Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.9 times the usual weather exposure. The split is drawn from 4,299 delay minutes reported on UA 623.
Cancellations run at 3.61%, 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
6.3% 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 about an hour, which a normal layover absorbs.
The 733 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 twelve other city pairs in the data, including ORD to BZN (103), ORD to SEA (32) and ORD to DEN (31), but none flew often enough under UA 623 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to ORD only.
One caution: this is a thin sample. 332 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 623
For a booking, the cancellation rate is the figure to plan around on UA 623: 3.61% of its 332 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
- LGA to ORD, every carrier and departure
- ORD to LGA, the return direction
- United Airlines 2389 on the same route88.7%
- United Airlines 1310 on the same route77.8%
- United Airlines 1504 on the same route59.4%
- United Airlines 2299 on the same route45.4%
- LaGuardia (LGA) delay statistics
- 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
- What a cancellation rate actually tells you (and what it hides)
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.