Flight number record
UA 2440
United Airlines · Chicago to Las Vegas
- Route
- ORD → LAS
- Departs
- 13:09
- Flights
- 271
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2440, check with United Airlines.
UA 2440 earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 271 flights, with a median arrival 9 minutes early.
Set against the rest of the country, UA 2440's record is 7 points better than the US average of 77.3%. That gap is worth roughly 68 fewer late arrivals for every thousand flights.
Key figures
On time
84.1%
Arrivals under 15 minutes late, of 270 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
5.2%
National rate is 8.3%
These figures cover 271 flights between September 2025 and August 2026. The median arrival is 9 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 2440 flies
UA 2440 flies ORD to LAS without a single fixed slot. Its most common scheduled departure was 13:09, used on 45 of 271 flights, with 11:00 (41 flights) and 12:50 (37 flights) next.
- Departs 13:0945 flights16.6%
- Departs 11:0041 flights15.1%
- Departs 12:5037 flights13.7%
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 13:09 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.3%, and UA 2440 runs 6 points better at 84.1%. 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 2440 next to ORD to LAS
Every carrier on ORD to LAS combined arrived on time 72.9% of the time across 5,154 flights, so UA 2440 is 11 points ahead of it. United flew 2,354 flights on the same city pair under all its flight numbers, including this one, and those ran 79.5% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 5 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2440thin sample | 271 | 84.1% | 66 min | 0.00% | B+ |
| All United Airlines on ORD–LAS | 2,354 | 79.5% | 68 min | 0.30% | B+ |
| All carriers on ORD–LAS | 5,154 | 72.9% | 75 min | 1.34% | C |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2440 quarter by quarter
UA 2440 did not run the same all year. Its best quarter was Jan–Mar 2026 at 93.8% on time and its weakest Jul–Sep 2026 at 73.8%, a swing of 20 points on roughly 54 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 flights86.7%
- Oct–Dec 202561 flights82.0%
- Jan–Mar 202648 flights93.8%
- Apr–Jun 202670 flights87.1%
- Jul–Sep 202662 flights73.8%
Scale runs 65% to 100%.
By weekday, UA 2440 did best on Thursday at 92.1% on time and worst on Monday at 72.5%. Each day rests on about 39 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2440 runs when it is late
UA 2440 often beats the schedule: 86 of 270 completed flights, 32%, arrived 15 minutes or more early. The 43 late arrivals split 15 under half an hour, 14 between 30 and 60 minutes, and 14 an hour or more.
- 15+ min early86 flights31.9%
- Within 15 min141 flights52.2%
- 15–29 min late15 flights5.6%
- 30–59 min late14 flights5.2%
- 1–2 hours late9 flights3.3%
- 2+ hours late5 flights1.9%
Scale runs 0% to 100%.
Share of 270 completed flights by arrival against schedule.
7 of 35 late departures made up the time and arrived on time, 20% 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 LAS.
The worst days
Worst days for UA 2440
The latest arrival of the period was on 31 August 2026, 5 hours 36 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. Three of the five worst days fell in August 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 31 August 2026 | 5 hours 36 minutes | Late-arriving aircraft |
| 29 November 2025 | 5 hours 30 minutes | Late-arriving aircraft |
| 13 August 2026 | 2 hours 17 minutes | Late-arriving aircraft |
| 11 June 2026 | 2 hours 14 minutes | National Airspace System |
| 24 August 2026 | 2 hours 12 minutes | Carrier |
Delay causes
Why UA 2440 runs late
Late-arriving aircraft accounts for 51% of the 2,824 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 29%National Airspace System
- 16%Carrier
- 4%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 2,824 reported delay minutes here, that single category outweighs weather by 14 to one. The split is drawn from 2,824 delay minutes reported on UA 2440.
Cancellations are rare at 0.00%, below the national 1.89% and low enough to earn the plus on the grade. Almost no flights are called off; the risk here is arriving late, not not arriving.
Connections and routes
What a delay on this flight costs
5.2% 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.
At 1,514 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The same number turns up on eight other city pairs in the data, including MCO to EWR (37), EWR to ORD (36) and LGA to ORD (24), but none flew often enough under UA 2440 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to ORD to LAS only.
One caution: this is a thin sample. 271 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 2440
For a booking, read UA 2440 as 84.1% on time with 0.00% cancelled over 271 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- ORD to LAS, every carrier and departure
- LAS to ORD, the return direction
- United Airlines 777 on the same route74.9%
- United Airlines 574 on the same route96.9%
- Chicago O'Hare International (ORD) delay statistics
- Harry Reid International (LAS) 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.