Route reliability record
EWR→SAN
Newark to San Diego
- Flights
- 1,561
- Period
- July 2025 to June 2026
- Distance
- 2,425 mi
- Carriers
- 2
This route lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That is a workable record, not a spotless one. That rests on 1,561 EWR to SAN flights, with a median arrival 9 minutes early.
Best time to fly EWR to SAN: a 5am–8am departure, ideally on a Monday. Flights in that window arrived on time 92.9% of the time and Monday flights 83.4%, against 79.9% for the route overall.
The US average over the same twelve months is 77.6%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.9%
Arrivals under 15 minutes late, of 1,515 completed flights
Avg delay
66 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.81%
Best carrier
United
80.5% on time across 1,233 flights
These figures cover 1,561 flights between July 2025 and June 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.
Carrier by carrier
Which airline is most reliable on EWR to SAN
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 | 1,233 | 80.5% | 64 min | 1.38% | B |
| Alaska Airlinesthin sample | 328 | 77.6% | 73 min | 3.96% | B− |
Flight by flight
Flights on EWR to SAN
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
Best ways to make this trip
The most reliable ways to fly Newark to San Diego
Every airline on this route and on the routes between nearby airports, ranked by how often a scheduled flight actually operated and arrived on time. 3 of the top 4 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. JFK → SANNew York to San Diego | JetBlue Airways | 83.6% | 85.7% | 2.48% | 8am–11am, Tue | B6 1189 15:59 |
| 2. EWR → SANNewark to San Diego | United Airlines | 79.4% | 80.5% | 1.38% | 5am–8am, Mon | UA 1826 09:15 |
| 3. JFK → SANNew York to San Diego | Delta Air Lines | 74.5% | 76.6% | 2.80% | 8am–11am, Mon | DL 685 20:25 |
| 4. JFK → SANNew York to San Diego | Alaska Airlines | 74.4% | 75.7% | 1.69% | 11am–2pm, Tue | AS 35 10:00 |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 38 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–8am358 flights92.9%
- 8am–11am355 flights80.6%
- 11am–2pm7 flights—
- 2pm–5pm389 flights77.2%
- 5pm–8pm411 flights73.4%
- 8pm–5am41 flights55.0%
Scale runs 45% to 100%. Rows with fewer than 30 flights show a dash.
The 8pm–5am window is where this operation falls apart: 55.0% 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 5pm–8pm window is the busiest, with 411 flights scheduled in it.
Across the year
When delays peak on this route
This route's year swings by 22 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
July is the worst month at 69.9% on time, 22 points below March, the best at 91.9%. 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. August was the busiest month here, with 155 flights.
Across the week, Monday is the strongest day at 83.4% on time and Sunday the weakest at 72.9%. 11 points is a smaller lever than departure hour, but it is free.
Delay causes
Why this route gets delayed
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 20,000 reported delay minutes.
- 36%Late-arriving aircraft
- 32%National Airspace System
- 24%Carrier
- 8%Extreme weather
- 0%Security
36% 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 20,000 reported delay minutes here, that single category outweighs weather by 4 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 20,098 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 1.92% against a national 1.81%, which is ordinary. Diversions add another 1.02%.
Connections and stage length
What a delay here actually costs
6.9% 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 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 is a different operation and performs like one: it runs 82.9% on time across 1,561 flights, 3 points above this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 3 points of difference.
The sample behind these figures is 1,561 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.
Work out the risk of missing a connection in SAN after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 91.9% on time and July 69.9%, a swing of 22 points. If the dates move at all, move them out of July before you think about anything else. 1,515 completed flights over 12 months sit behind that.
Common questions
EWR to SAN questions
How often is EWR to SAN delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.1% of the 1,561 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.
How reliable is EWR to SAN compared with the rest of the country?
79.9% of flights arrive on time here against a national 77.6%, a difference of 2 points in its favour. That is worth a B on this site's grading scale.
What time of day has the fewest delays on EWR to SAN?
The 5am–8am departure window is the strongest at 92.9% on time. The 8pm–5am window is the weakest at 55.0%, 38 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are July delays on EWR to SAN?
July is the weakest month at 69.9% on time, compared with 91.9% in March. Across the year that is 22 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- SAN to EWR — the return legseparate record
- Newark Liberty International (EWR) delay statistics
- San Diego International (SAN) delay statistics
- United Airlines on EWR to SAN80.5%
- Alaska Airlines on EWR to SAN77.6%
- EWR to MCO, a related route77.1%
- SFO to SAN, a related route66.6%
- EWR to ATL, a related route77.6%
- United Airlines on-time record80.5%
- Alaska Airlines on-time record77.6%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.04 million flight records
Direction matters. EWR to SAN and SAN to EWR are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
Embed EWR to SAN’s on-time badge on your site
Paste this into a web page. The badge shows the current on-time rate, cancellation rate and grade, and updates every month. Preview it, or build a badge for another route or airport.
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.