Flight number record
UA 1504
United Airlines · New York to Chicago
- Route
- LGA → ORD
- Departs
- 15:25
- Flights
- 299
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 1504, check with United Airlines.
UA 1504 draws a D−. Roughly one flight in two arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 299 flights, with a median arrival 7 minutes late.
The national on-time rate over the same period is 77.3%, so UA 1504 runs 18 points behind the country as a whole. Across a thousand flights that is about 179 extra late arrivals.
Key figures
On time
59.4%
Arrivals under 15 minutes late, of 283 completed flights
Avg delay
106 min
Across delayed arrivals only, not all flights
Cancelled
5.02%
National rate is 1.89%
1 hour+ late
21.9%
National rate is 8.3%
These figures cover 299 flights between September 2025 and August 2026. Beyond the headline rate, 21.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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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 125 of 299 flights, with 15:20 (109 flights) and 15:15 (47 flights) next.
- Departs 15:25125 flights41.8%
- Departs 15:20109 flights36.5%
- Departs 15:1547 flights15.7%
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 15:25 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and UA 1504 runs 13 points worse at 59.4%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
UA 1504 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 1504 is 7 points behind 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%, which this flight trails by 19 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 1504thin sample | 299 | 59.4% | 106 min | 5.02% | D− |
| 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 1504 quarter by quarter
UA 1504 did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.3% on time and its weakest Oct–Dec 2025 at 42.7%, a swing of 41 points on roughly 60 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 flights83.3%
- Oct–Dec 202577 flights42.7%
- Jan–Mar 202661 flights67.2%
- Apr–Jun 202678 flights63.4%
- Jul–Sep 202653 flights55.1%
Scale runs 35% to 90%.
By weekday, UA 1504 did best on Tuesday at 71.7% on time and worst on Sunday at 47.7%. Each day rests on about 43 flights, so a gap of 24 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 1504 runs when it is late
When UA 1504 is late it tends to be very late: 62 of its 115 late arrivals were an hour or more behind, and 34 were two hours or more.
- 15+ min early46 flights16.3%
- Within 15 min122 flights43.1%
- 15–29 min late25 flights8.8%
- 30–59 min late28 flights9.9%
- 1–2 hours late28 flights9.9%
- 2+ hours late34 flights12.0%
Scale runs 0% to 100%.
Share of 283 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 96 departures that left 15 minutes late or more, only 4 made it up before arrival. In the other direction, 23 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 1504
The latest arrival of the period was on 18 May 2026, 7 hours 26 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in March 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 May 2026 | 7 hours 26 minutes | Carrier |
| 30 October 2025 | 7 hours 19 minutes | Late-arriving aircraft |
| 31 March 2026 | 7 hours 1 minute | Carrier |
| 15 March 2026 | 6 hours 58 minutes | National Airspace System |
| 6 March 2026 | 6 hours 47 minutes | Late-arriving aircraft |
Delay causes
Why UA 1504 runs late
Late-arriving aircraft accounts for 43% of the 12,000 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 36%National Airspace System
- 14%Carrier
- 7%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 12,000 reported delay minutes here, that single category outweighs weather by 6 to one. The split is drawn from 12,236 delay minutes reported on UA 1504.
Cancellations run at 5.02%, against 1.89% nationally. That is about one flight in twenty 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
21.9% 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 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 eleven other city pairs in the data, including ORD to CVG (55), ORD to SNA (31) and ORD to LAS (19), 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. 299 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: 5.02% of its 299 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 route88.7%
- United Airlines 623 on the same route78.6%
- United Airlines 1310 on the same route77.8%
- 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
- 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.