Route reliability record

JFK→SAN

New York to San Diego

Flights: 2,413
Period: July 2025 to June 2026
Distance: 2,446 mi
Carriers: 3

This route lands a B, 2 points better than the national rate of 77.6%. About one flight in five arrive 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 2,413 flights, of which JetBlue Airways flew 727 at 85.7% on time.

JetBlue Airways is the most reliable of the three carriers covered here at 85.7% on time across 727 flights.

On time

79.1%

Arrivals under 15 minutes late, of 2,339 completed flights

Avg delay

58 min

Across delayed arrivals only, not all flights

Cancelled

2.40%

National rate is 1.81%

Best carrier

JetBlue

85.7% on time across 727 flights

These figures cover 2,413 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 JFK to SAN

The choice of carrier is not cosmetic here. JetBlue Airways arrives on time 85.7% of the time; Alaska Airlines manages 75.7%. Sample sizes sit next to every figure, because a two-point gap across 650 flights means less than a ten-point one.

On-time performance by carrier on JFK to SAN
Airline	Flights	On time	Avg delay	Cancelled	Grade
JetBlue Airways	727	85.7%	61 min	2.48%	A
Delta Air Lines	1,036	76.6%	57 min	2.80%	B
Alaska Airlines	650	75.7%	56 min	1.69%	B

JetBlue leads Alaska by 10 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.

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 15 points, against 10 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.

5am–8am235 flights88.9%
8am–11am692 flights80.2%
11am–2pm104 flights86.1%
2pm–5pm698 flights78.3%
5pm–8pm380 flights73.8%
8pm–5am304 flights74.7%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 88.9% of the time, against 73.8% for the evening window. That is 15 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 698 flights scheduled in it.

Across the year

When delays peak on this route

This route's year swings by 16 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.

Darker means more delays. Figures are on-time percentages.March best, July worst

July is the worst month at 71.1% on time, 16 points below March, the best at 86.8%. 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 213 flights.

Across the week, Tuesday is the strongest day at 85.1% on time and Sunday the weakest at 71.3%. 14 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 28,000 reported delay minutes.

National Airspace System
38%
Carrier
37%
Late-arriving aircraft
21%
Extreme weather
3%
Security
1%

The largest share of delay minutes, 37%, 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 10,000 of the 28,000 delay minutes reported here. The split is drawn from 28,186 reported delay minutes.

38% 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 11,000 minutes out of 28,000, against a national NAS share of 21%.

Cancellations sit at 2.40% against a national 1.81%, which is ordinary. Diversions add another 0.66%.

Connections and stage length

What a delay here actually costs

5.9% 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 are the about an hour kind, which a normal layover absorbs.

At 2,446 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 83.8% on time across 2,413 flights, 5 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 5 points of difference.

The sample behind these figures is 2,413 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 this route

Put together: the calendar is the biggest lever here, not the carrier or the hour. March runs 86.8% on time and July 71.1%, a swing of 16 points. If the dates move at all, move them out of July before you think about anything else. 2,339 completed flights over 12 months sit behind that.

Common questions

JFK to SAN questions

How often is JFK to SAN delayed?

About one flight in five arrive at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.9% of the 2,413 flights in this analysis, against 22.4% nationally. Delayed flights are late by about an hour on average.

Which airline is most reliable on JFK to SAN?

JetBlue Airways leads at 85.7% on time across 727 flights. Alaska Airlines is at the other end on 75.7%, a gap of 10 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.

What time of day has the fewest delays on JFK to SAN?

The 5am–8am departure window is the strongest at 88.9% on time. The 5pm–8pm window is the weakest at 73.8%, 15 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 JFK to SAN?

July is the weakest month at 71.1% on time, compared with 86.8% in March. Across the year that is 16 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.

Where to go next

Direction matters. JFK to SAN and SAN to JFK are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Updated monthly. How this data is collected.

Key figures