Carrier route record
UASAN→EWR
United Airlines · San Diego to Newark
- Flights
- 1,233
- Period
- July 2025 to June 2026
- Share of route
- 79%
- Carriers
- 2
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.
United on SAN to EWR lands a B, 5 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by an hour and a half on average. That is a workable record, not a spotless one. That rests on 1,233 flights, with a median arrival 12 minutes early.
Set against the rest of the country, United's SAN to EWR record is 5 points better than the US average of 77.6%. That gap is worth roughly 53 fewer late arrivals for every thousand flights.
Key figures
On time
82.9%
Arrivals under 15 minutes late, of 1,201 completed flights
Avg delay
82 min
Across delayed arrivals only, not all flights
Cancelled
1.87%
National rate is 1.81%
Whole route
82.9%
Every carrier on SAN to EWR, 1,561 flights
These figures cover 1,233 flights between July 2025 and June 2026. The median arrival is 12 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.
Carrier by carrier
United against every carrier on SAN to EWR
United flew 1,233 of the 1,561 flights on SAN to EWR, most of the route. Its 82.9% on time is about level with the route as a whole at 82.9%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from United at 82.9% to Alaska at 82.6%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines (this page) | 1,233 | 82.9% | 82 min | 1.87% | B |
| Alaska Airlinesthin sample | 328 | 82.6% | 85 min | 3.66% | B− |
Flight by flight
United flight numbers on SAN to EWR
Departure window
When United runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 27 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am364 flights84.6%
- 8am–11am—
- 11am–2pm157 flights64.2%
- 2pm–5pm204 flights74.4%
- 5pm–8pm—
- 8pm–5am508 flights90.9%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 64.2% on time against 90.9% for 8pm–5am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise. The 8pm–5am window is the busiest, with 508 flights scheduled in it.
Across the year
United on SAN to EWR through the year
April is the best month on the calendar at 95.6% on time. Shoulder season thins the schedule and takes the summer weather with it, and the operation gets its margin back. August was the busiest month here, with 124 flights.
Across the week, Tuesday is the strongest day at 88.0% on time and Thursday the weakest at 78.5%. 10 points is a smaller lever than departure hour, but it is free.
Delay causes
Why United runs late on this route
One category carries most of the weight here. National Airspace System accounts for 43% of the 17,000 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.
- 43%National Airspace System
- 24%Carrier
- 20%Late-arriving aircraft
- 13%Extreme weather
Extreme weather accounts for 13% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the monthly strip above is the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.1 times the usual weather exposure. The split is drawn from 16,847 reported delay minutes.
43% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 7,179 minutes out of 17,000, against a national NAS share of 21%.
Cancellations sit at 1.87% against a national 1.81%, which is ordinary. Diversions add another 0.73%.
Connections and stage length
What a delay here costs
7.0% 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 an hour and a half, which a normal layover absorbs.
At 2,425 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 return leg runs 80.5% on time across 1,233 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,233 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
What to do with this
Booking United on SAN to EWR
Put together: the calendar is the biggest lever here, not the carrier or the hour. April runs 95.6% on time and March 70.7%, a swing of 25 points. If the dates move at all, move them out of March before you think about anything else. 1,201 completed flights over 12 months sit behind that.
Related
Where to go next
- SAN to EWR, every carrier
- United on EWR to SAN, the return leg
- Alaska Airlines on SAN to EWR82.6%
- United Airlines network-wide record
- San Diego International (SAN) delay statistics
- Newark Liberty International (EWR) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Worst months to fly in the US, ranked by the data
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.