Flight number record
UA 2102
United Airlines · Las Vegas to Chicago
- Route
- LAS → ORD
- Departs
- 23:59
- Flights
- 345
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s UA 2102, check with United Airlines.
UA 2102 earns an A+. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 13 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 345 flights, with a median arrival 13 minutes early.
Set against the rest of the country, UA 2102's record is 13 points better than the US average of 77.3%. That gap is worth roughly 134 fewer late arrivals for every thousand flights.
Key figures
On time
90.7%
Arrivals under 15 minutes late, of 345 completed flights
Avg delay
56 min
Across delayed arrivals only, not all flights
Cancelled
0.00%
National rate is 1.89%
1 hour+ late
2.9%
National rate is 8.3%
These figures cover 345 flights between September 2025 and August 2026. The median arrival is 13 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 2102 flies
UA 2102 flies LAS to ORD without a single fixed slot. Its most common scheduled departure was 23:59, used on 205 of 345 flights, with 23:30 (117 flights) next.
- Departs 23:59205 flights59.4%
- Departs 23:30117 flights33.9%
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 23:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and UA 2102 runs 21 points better at 90.7%. 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 2102 next to LAS to ORD
Every carrier on LAS to ORD combined arrived on time 75.6% of the time across 5,148 flights, so UA 2102 is 15 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 78.2% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2102thin sample | 345 | 90.7% | 56 min | 0.00% | A+ |
| All United Airlines on LAS–ORD | 2,354 | 78.2% | 76 min | 0.34% | B+ |
| All carriers on LAS–ORD | 5,148 | 75.6% | 88 min | 1.24% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2102 quarter by quarter
UA 2102 did not run the same all year. Its best quarter was Jan–Mar 2026 at 94.0% on time and its weakest Jul–Sep 2026 at 77.4%, a swing of 17 points on roughly 86 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 202528 flights—
- Oct–Dec 202580 flights92.5%
- Jan–Mar 202684 flights94.0%
- Apr–Jun 202691 flights93.4%
- Jul–Sep 202662 flights77.4%
Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2102 ranged from 84.3% on Sunday to 95.7% on Wednesday. With about 49 flights behind each day, a spread of 11 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late UA 2102 runs when it is late
UA 2102 often beats the schedule: 151 of 345 completed flights, 44%, arrived 15 minutes or more early. The 32 late arrivals split 11 under half an hour, 11 between 30 and 60 minutes, and 10 an hour or more.
- 15+ min early151 flights43.8%
- Within 15 min162 flights47.0%
- 15–29 min late11 flights3.2%
- 30–59 min late11 flights3.2%
- 1–2 hours late7 flights2.0%
- 2+ hours late3 flights0.9%
Scale runs 0% to 100%.
Share of 345 completed flights by arrival against schedule.
A late pushback is often recovered here: of 45 departures that left 15 minutes late or more, 19 still arrived on time. Only 6 left on time and still arrived late.
The worst days
Worst days for UA 2102
The latest arrival of the period was on 17 May 2026, 4 hours 17 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On four of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 17 May 2026 | 4 hours 17 minutes | National Airspace System |
| 19 June 2026 | 2 hours 35 minutes | Late-arriving aircraft |
| 9 November 2025 | 2 hours 26 minutes | Late-arriving aircraft |
| 9 August 2026 | 1 hour 41 minutes | Late-arriving aircraft |
| 26 December 2025 | 1 hour 27 minutes | Late-arriving aircraft |
Delay causes
Why UA 2102 runs late
Late-arriving aircraft accounts for 52% of the 1,786 delay minutes carriers reported here, and the remaining four split what is left.
- 52%Late-arriving aircraft
- 24%National Airspace System
- 24%Carrier
52% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,786 reported delay minutes here, that single category outweighs weather by 52 to one. The split is drawn from 1,786 delay minutes reported on UA 2102.
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
Badly late arrivals are rare here: only 2.9% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
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.
Every one of the 345 flights under UA 2102 in the data flew LAS to ORD. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 345 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 2102
For a booking, UA 2102 has one of the better records a US domestic flight can show: 90.7% on time and 0.00% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- LAS to ORD, every carrier and departure
- ORD to LAS, the return direction
- United Airlines 664 on the same route86.2%
- American Airlines 2258 on the same route88.1%
- United Airlines 1583 on the same route80.1%
- United Airlines 706 on the same route65.0%
- Harry Reid International (LAS) 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.