Flight number record
UA 2303
United Airlines · Los Angeles to Newark
- Route
- LAX → EWR
- Departs
- 23:59
- Flights
- 365
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s UA 2303, check with United Airlines.
UA 2303 sits in the middle of the pack with a B. Close to three flights in four arrive on time by the DOT's definition, 2 points worse than the national rate of 77.6%. The late ones land about an hour behind schedule. That rests on 365 flights, with a median arrival 3 minutes early.
Key figures
On time
75.9%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.81%
1 hour+ late
7.3%
National rate is 8.1%
These figures cover 365 flights between July 2025 and June 2026. The median arrival is 3 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 2303 flies
UA 2303 flies LAX to EWR without a single fixed slot. Its most common scheduled departure was 23:59, used on 113 of 365 flights, with 23:00 (75 flights) and 23:15 (62 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 23:59113 flights31.0%
- Departs 23:0075 flights20.5%
- Departs 23:1562 flights17.0%
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 2303 runs 5 points better at 75.9%. 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 2303 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 2303 is 4 points behind 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 trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| UA 2303 | 365 | 75.9% | 57 min | 1.92% | B |
| 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 2303 quarter by quarter
UA 2303 did not run the same all year. Its best quarter was Apr–Jun 2026 at 85.6% on time and its weakest Oct–Dec 2025 at 63.7%, a swing of 22 points on roughly 91 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 202592 flights84.3%
- Oct–Dec 202592 flights63.7%
- Jan–Mar 202690 flights70.1%
- Apr–Jun 202691 flights85.6%
Scale runs 55% to 90%. Rows with fewer than 30 flights show a dash.
By weekday, UA 2303 did best on Sunday at 84.0% on time and worst on Friday at 70.6%. Each day rests on about 52 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Delay causes
Why UA 2303 runs late
One category carries most of the weight here. Carrier accounts for 55% of the 4,863 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.
- 55%Carrier
- 28%Late-arriving aircraft
- 15%National Airspace System
- 2%Extreme weather
The largest share of delay minutes, 55%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,694 of the 4,863 delay minutes reported here. The split is drawn from 4,863 delay minutes reported on UA 2303.
Cancellations sit at 1.92% against a national 1.81%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
7.3% 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 an hour, 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 one other city pair in the data, including SFO to LAX (21), but none flew often enough under UA 2303 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 2303
For a booking, read UA 2303 as 75.9% on time with 1.92% cancelled over 365 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 2397 on the same route88.1%
- United Airlines 2096 on the same route84.8%
- United Airlines 2127 on the same route72.1%
- United Airlines 1855 on the same route63.4%
- United Airlines 1981 on the same route72.3%
- United Airlines 2743 on the same route93.5%
- 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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.