Flight number record

UA 2102

United Airlines · Las Vegas to Chicago

Route: LAS → ORD
Departs: 23:59
Flights: 345
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 14 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 345 flights, with a median arrival 14 minutes early.

Set against the rest of the country, UA 2102's record is 14 points better than the US average of 77.6%. That gap is worth roughly 137 fewer late arrivals for every thousand flights.

On time

91.3%

Arrivals under 15 minutes late, of 344 completed flights

Avg delay

71 min

Across delayed arrivals only, not all flights

Cancelled

0.29%

National rate is 1.81%

1 hour+ late

3.8%

National rate is 8.1%

These figures cover 345 flights between July 2025 and June 2026. The median arrival is 14 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.

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 218 of 345 flights, with 23:30 (76 flights) and 23:43 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 23:59218 flights63.2%
Departs 23:3076 flights22.0%
Departs 23:4349 flights14.2%

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 23:59 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 2102 runs 21 points better at 91.3%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

UA 2102 next to LAS to ORD

Every carrier on LAS to ORD combined arrived on time 76.5% of the time across 5,297 flights, so UA 2102 is 15 points ahead of it. United flew 2,330 flights on the same city pair under all its flight numbers, including this one, and those ran 79.3% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 12 points.

UA 2102 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2102thin sample	345	91.3%	71 min	0.29%	A+
All United Airlines on LAS–ORD	2,330	79.3%	71 min	0.43%	B+
All carriers on LAS–ORD	5,297	76.5%	79 min	1.25%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2102 quarter by quarter

Quarter by quarter UA 2102 held fairly steady: 85.4% in Jul–Sep 2025, 92.5% in Oct–Dec 2025, 94.0% in Jan–Mar 2026 and 93.4% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202590 flights85.4%
Oct–Dec 202580 flights92.5%
Jan–Mar 202684 flights94.0%
Apr–Jun 202691 flights93.4%

Scale runs 75% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2102 ranged from 88.5% on Thursday to 95.7% on Tuesday. With about 49 flights behind each day, a spread of 7 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why UA 2102 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 63% of the 2,118 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
63%
National Airspace System
20%
Carrier
17%

63% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 2,118 reported delay minutes here, that single category outweighs weather by 63 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 2,118 delay minutes reported on UA 2102.

Cancellations are rare at 0.29%, below the national 1.81% and low enough to earn the plus on the grade. Roughly one flight in 100 is 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 3.8% land an hour or more behind schedule, against 8.1% 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: 91.3% on time and 0.29% cancelled. That is a base rate, not a promise about any single day.

Where to go next

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.

Key figures