Flight number record

UA 2397

United Airlines · Los Angeles to Newark

Route: LAX → EWR
Departs: 21:00
Flights: 365
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2397, check with United Airlines.

UA 2397 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 11 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 2.3 hours. That rests on 365 flights, with a median arrival 16 minutes early.

Set against the rest of the country, UA 2397's record is 11 points better than the US average of 77.6%. That gap is worth roughly 105 fewer late arrivals for every thousand flights.

On time

88.1%

Arrivals under 15 minutes late, of 353 completed flights

Avg delay

138 min

Across delayed arrivals only, not all flights

Cancelled

3.01%

National rate is 1.81%

1 hour+ late

5.9%

National rate is 8.1%

These figures cover 365 flights between July 2025 and June 2026. The median arrival is 16 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 2397 flies

UA 2397 flies LAX to EWR without a single fixed slot. Its most common scheduled departure was 21:00, used on 208 of 365 flights, with 21:30 (58 flights) and 20:55 (49 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:00208 flights57.0%
Departs 21:3058 flights15.9%
Departs 20:5549 flights13.4%

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 21:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and UA 2397 runs 18 points better at 88.1%. 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 2397 next to LAX to EWR

Every carrier on LAX to EWR combined arrived on time 79.6% of the time across 4,925 flights, so UA 2397 is 9 points ahead of it. United flew 3,539 flights on the same city pair under all its flight numbers, including this one, and those ran 78.7% on time. Across its whole network United Airlines managed 79.0%, which this flight beats by 9 points.

UA 2397 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
UA 2397	365	88.1%	138 min	3.01%	A−
All United Airlines on LAX–EWR	3,539	78.7%	79 min	1.92%	B
All carriers on LAX–EWR	4,925	79.6%	76 min	2.07%	B
United Airlines, whole network	821,041	79.0%	72 min	1.01%	B

Across the year

UA 2397 quarter by quarter

Quarter by quarter UA 2397 held fairly steady: 88.6% in Jul–Sep 2025, 85.7% in Oct–Dec 2025, 90.5% in Jan–Mar 2026 and 87.8% in Apr–Jun 2026. A spread of 5 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights88.6%
Oct–Dec 202592 flights85.7%
Jan–Mar 202690 flights90.5%
Apr–Jun 202691 flights87.8%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, UA 2397 did best on Monday at 92.2% on time and worst on Thursday at 76.0%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.

Delay causes

Why UA 2397 runs late

One category carries most of the weight here. Carrier accounts for 59% of the 5,778 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.

Carrier
59%
Late-arriving aircraft
35%
National Airspace System
5%
Extreme weather
1%

35% 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 5,778 reported delay minutes here, that single category outweighs weather by 26 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 5,778 delay minutes reported on UA 2397.

Cancellations run at 3.01%, against 1.81% nationally. That is roughly one flight in 30 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

5.9% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about 2.3 hours, which a normal layover absorbs.

At 2,454 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 two other city pairs in the data, including SEA to LAX (48) and SFO to SEA (15), but none flew often enough under UA 2397 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LAX to EWR only.

One caution: this is a thin sample. 365 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 2397

For a booking, the cancellation rate is the figure to plan around on UA 2397: 3.01% of its 365 scheduled flights did not operate. A late arrival costs about 2.3 hours, but a cancellation costs the day, so leave a later option open.

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