Carrier route record
UAEWR→SAN
United Airlines · Newark to San Diego
- Flights
- 1,229
- Period
- September 2025 to August 2026
- Share of route
- 79%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with United Airlines.
United on EWR to SAN lands a B, 3 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 1,229 flights, with a median arrival 9 minutes early.
The US average over the same twelve months is 77.3%, so there is little to separate United on EWR to SAN from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
80.1%
Arrivals under 15 minutes late, of 1,194 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
1.95%
National rate is 1.89%
Whole route
79.4%
Every carrier on EWR to SAN, 1,557 flights
These figures cover 1,229 flights between September 2025 and August 2026. The median arrival is 9 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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Carrier by carrier
United against every carrier on EWR to SAN
United flew 1,229 of the 1,557 flights on EWR to SAN, most of the route. Its 80.1% on time is about level with the route as a whole at 79.4%. Ranked by on-time rate it is first of two carriers on the route, where the range runs from United at 80.1% to Alaska at 77.0%. 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) | 1,229 | 80.1% | 63 min | 1.95% | B |
| Alaska Airlinesthin sample | 328 | 77.0% | 67 min | 3.66% | B− |
Flight by flight
United flight numbers on EWR to SAN
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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 34 points, against half a point between the best and worst carrier.
- 5am–8am358 flights92.9%
- 8am–11am362 flights78.2%
- 11am–2pm—
- 2pm–5pm76 flights72.6%
- 5pm–8pm334 flights76.1%
- 8pm–5am99 flights58.5%
Scale runs 50% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 58.5% on time, against 92.9% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 8am–11am window is the busiest, with 362 flights scheduled in it.
Across the year
United on EWR to SAN through the year
June is the worst month at 71.4% on time, 20 points below March, the best at 91.3%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 122 flights.
Across the week, Wednesday is the strongest day at 84.0% on time and Sunday the weakest at 72.9%, a spread of 11 points.
Arrival by arrival
How late United on EWR to SAN runs when it is late
United on EWR to SAN often beats the schedule: 478 of 1,194 completed flights, 40%, arrived 15 minutes or more early. The 238 late arrivals split 88 under half an hour, 73 between 30 and 60 minutes, and 77 an hour or more.
- 15+ min early478 flights40.0%
- Within 15 min478 flights40.0%
- 15–29 min late88 flights7.4%
- 30–59 min late73 flights6.1%
- 1–2 hours late45 flights3.8%
- 2+ hours late32 flights2.7%
Scale runs 0% to 100%.
Share of 1,194 completed flights by arrival against schedule.
59 of 216 late departures made up the time and arrived on time, 27% of them. In the other direction, 81 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at SAN.
The worst days
Worst days for United on EWR to SAN
The latest arrival of the period was on 11 July 2026, 8 hours 28 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 July 2026 | 8 hours 28 minutes | Carrier |
| 18 July 2026 | 5 hours 19 minutes | Late-arriving aircraft |
| 6 July 2026 | 4 hours 51 minutes | Late-arriving aircraft |
| 12 June 2026 | 4 hours 27 minutes | National Airspace System |
| 18 June 2026 | 4 hours 16 minutes | Carrier |
Delay causes
Why United runs late on this route
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 15,000 reported delay minutes.
- 36%National Airspace System
- 31%Carrier
- 31%Late-arriving aircraft
- 2%Extreme weather
36% 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 5,347 minutes out of 15,000, against a national NAS share of 21%. The split is drawn from 14,908 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 92.9% on time here.
Cancellations sit at 1.95% against a national 1.89%, which is ordinary. Diversions add another 0.90%.
Connections and stage length
What a delay here costs
6.4% 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 about an hour, 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 81.3% on time across 1,229 flights, within about a point 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 1,229 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 EWR to SAN
Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 91.3% on time and June 71.4%, a swing of 20 points. If the dates move at all, move them out of June before you think about anything else. 1,194 completed flights over 12 months sit behind that.
Related
Where to go next
- EWR to SAN, every carrier
- United on SAN to EWR, the return leg
- Alaska Airlines on EWR to SAN77.0%
- United Airlines network-wide record
- Newark Liberty International (EWR) delay statistics
- San Diego International (SAN) delay statistics
- The best time of day to fly, according to 7.05 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.