Flight number record
UA 1504
United Airlines · New York to Chicago
- Route
- LGA → ORD
- Departs
- 15:25
- Flights
- 308
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 1504, check with United Airlines.
UA 1504 earns a D−, which is as low as this site's scale goes for a reason. Only 57.8% of flights arrive inside the 15-minute window, 20 points worse than the national rate of 77.6%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 308 flights, with a median arrival 8 minutes late.
The national on-time rate over the same period is 77.6%, so UA 1504 runs 20 points behind the country as a whole. Across a thousand flights that is about 198 extra late arrivals.
Key figures
On time
57.8%
Arrivals under 15 minutes late, of 294 completed flights
Avg delay
106 min
Across delayed arrivals only, not all flights
Cancelled
4.22%
National rate is 1.81%
1 hour+ late
22.1%
National rate is 8.1%
These figures cover 308 flights between July 2025 and June 2026. Beyond the headline rate, 22.1% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.
Schedule
When UA 1504 flies
UA 1504 flies LGA to ORD without a single fixed slot. Its most common scheduled departure was 15:25, used on 152 of 308 flights, with 15:20 (109 flights) and 15:15 (47 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 15:25152 flights49.4%
- Departs 15:20109 flights35.4%
- Departs 15:1547 flights15.3%
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 15:25 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 72.4%, and UA 1504 runs 15 points worse at 57.8%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
Against the route
UA 1504 next to LGA to ORD
Every carrier on LGA to ORD combined arrived on time 67.3% of the time across 11,625 flights, so UA 1504 is 10 points behind it. United flew 4,662 flights on the same city pair under all its flight numbers, including this one, and those ran 66.7% on time. Across its whole network United Airlines managed 79.0%, which this flight trails by 21 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1504thin sample | 308 | 57.8% | 106 min | 4.22% | D− |
| All United Airlines on LGA–ORD | 4,662 | 66.7% | 88 min | 3.69% | C− |
| All carriers on LGA–ORD | 11,625 | 67.3% | 89 min | 4.94% | C− |
| United Airlines, whole network | 821,041 | 79.0% | 72 min | 1.01% | B |
Across the year
UA 1504 quarter by quarter
UA 1504 did not run the same all year. Its best quarter was Jan–Mar 2026 at 67.2% on time and its weakest Oct–Dec 2025 at 42.7%, a swing of 25 points on roughly 77 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 202592 flights60.0%
- Oct–Dec 202577 flights42.7%
- Jan–Mar 202661 flights67.2%
- Apr–Jun 202678 flights63.4%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, UA 1504 did best on Thursday at 66.7% on time and worst on Sunday at 45.5%. Each day rests on about 44 flights, so a gap of 21 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 1504 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 13,000 reported delay minutes.
- 37%Late-arriving aircraft
- 36%National Airspace System
- 15%Carrier
- 12%Extreme weather
Extreme weather accounts for 12% 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 2.0 times the usual weather exposure. The split is drawn from 13,183 delay minutes reported on UA 1504.
Cancellations run at 4.22%, against 1.81% nationally. That is about one flight in 25 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
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 22.1% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.
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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The same number turns up on eleven other city pairs in the data, including ORD to CVG (68), ORD to ATL (46) and ORD to SNA (31), but none flew often enough under UA 1504 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. 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 1504
For a booking, the cancellation rate is the figure to plan around on UA 1504: 4.22% of its 308 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
- LGA to ORD, every carrier and departure
- ORD to LGA, the return direction
- United Airlines 2389 on the same route88.1%
- United Airlines 623 on the same route80.0%
- United Airlines 1310 on the same route79.9%
- United Airlines 2299 on the same route46.5%
- 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
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.