Flight number record
UA 2397
United Airlines · Los Angeles to Newark
- Route
- LAX → EWR
- Departs
- 21:00
- Flights
- 362
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 362 flights, with a median arrival 15 minutes early.
Set against the rest of the country, UA 2397's record is 10 points better than the US average of 77.3%. That gap is worth roughly 102 fewer late arrivals for every thousand flights.
Key figures
On time
87.5%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
121 min
Across delayed arrivals only, not all flights
Cancelled
2.21%
National rate is 1.89%
1 hour+ late
5.4%
National rate is 8.3%
These figures cover 362 flights between September 2025 and August 2026. The median arrival is 15 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 2397 flies
UA 2397 flies LAX to EWR without a single fixed slot. Its most common scheduled departure was 21:00, used on 254 of 362 flights, with 21:30 (58 flights) and 21:05 (48 flights) next.
- Departs 21:00254 flights70.2%
- Departs 21:3058 flights16.0%
- Departs 21:0548 flights13.3%
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 21:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and UA 2397 runs 17 points better at 87.5%. 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 2397 next to LAX to EWR
Every carrier on LAX to EWR combined arrived on time 79.1% of the time across 4,748 flights, so UA 2397 is 8 points ahead of it. United flew 3,526 flights on the same city pair under all its flight numbers, including this one, and those ran 77.7% on time. Across its whole network United Airlines managed 78.8%, which this flight beats by 9 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2397thin sample | 362 | 87.5% | 121 min | 2.21% | A |
| All United Airlines on LAX–EWR | 3,526 | 77.7% | 77 min | 1.76% | B |
| All carriers on LAX–EWR | 4,748 | 79.1% | 75 min | 2.11% | B |
| United Airlines, whole network | 830,825 | 78.8% | 73 min | 1.02% | B |
Across the year
UA 2397 quarter by quarter
Quarter by quarter UA 2397 held fairly steady: 86.7% in Jul–Sep 2025, 85.7% in Oct–Dec 2025, 90.5% in Jan–Mar 2026, 87.8% in Apr–Jun 2026 and 86.2% in Jul–Sep 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 202530 flights86.7%
- Oct–Dec 202592 flights85.7%
- Jan–Mar 202690 flights90.5%
- Apr–Jun 202691 flights87.8%
- Jul–Sep 202659 flights86.2%
Scale runs 75% to 95%.
By weekday, UA 2397 did best on Tuesday at 92.0% on time and worst on Thursday at 76.5%. Each day rests on about 52 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late UA 2397 runs when it is late
UA 2397 often beats the schedule: 181 of 353 completed flights, 51%, arrived 15 minutes or more early. The 44 late arrivals split 13 under half an hour, 12 between 30 and 60 minutes, and 19 an hour or more.
- 15+ min early181 flights51.3%
- Within 15 min128 flights36.3%
- 15–29 min late13 flights3.7%
- 30–59 min late12 flights3.4%
- 1–2 hours late10 flights2.8%
- 2+ hours late9 flights2.5%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
A late pushback is often recovered here: of 59 departures that left 15 minutes late or more, 19 still arrived on time. Only 4 left on time and still arrived late.
The worst days
Worst days for UA 2397
The latest arrival of the period was on 28 February 2026, 15 hours 42 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 February 2026 | 15 hours 42 minutes | Carrier |
| 20 May 2026 | 11 hours 38 minutes | Late-arriving aircraft |
| 4 April 2026 | 11 hours 36 minutes | Carrier |
| 22 January 2026 | 7 hours 55 minutes | Carrier |
| 26 June 2026 | 5 hours 34 minutes | Carrier |
Delay causes
Why UA 2397 runs late
Carrier accounts for 68% of the 5,311 delay minutes carriers reported here, and the remaining four split what is left.
- 68%Carrier
- 24%Late-arriving aircraft
- 6%National Airspace System
- 1%Extreme weather
The largest share of delay minutes, 68%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 3,634 of the 5,311 delay minutes reported here. The split is drawn from 5,311 delay minutes reported on UA 2397.
Cancellations sit at 2.21% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
5.4% 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 close to two 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.
Every one of the 362 flights under UA 2397 in the data flew LAX to EWR. 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. 362 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, read UA 2397 as 87.5% on time with 2.21% cancelled over 362 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- LAX to EWR, every carrier and departure
- EWR to LAX, the return direction
- United Airlines 2127 on the same route73.4%
- United Airlines 2303 on the same route75.7%
- United Airlines 2096 on the same route79.9%
- United Airlines 2743 on the same route93.5%
- United Airlines 1855 on the same route62.3%
- United Airlines 1981 on the same route68.5%
- Los Angeles International (LAX) delay statistics
- Newark Liberty International (EWR) 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
- Worst months to fly in the US, ranked by the data
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.