Route reliability record
SFO→SNA
San Francisco to Santa Ana
- Flights
- 4,749
- Period
- June 2025 to May 2026
- Distance
- 372 mi
- Carriers
- 4
This route lands a B, 4 points better than the national rate of 77.4%. 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 4,749 flights, of which United Airlines flew 1,011 at 84.4% on time.
The US average over the same twelve months is 77.4%, 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
81.2%
Arrivals under 15 minutes late, of 4,686 completed flights
Avg delay
57 min
Across delayed arrivals only, not all flights
Cancelled
1.16%
National rate is 1.80%
Best carrier
United
84.4% on time across 1,011 flights
These figures cover 4,749 flights between June 2025 and May 2026. The median arrival is 7 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 SFO to SNA
The two carriers here are closely matched: 4 points separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Alaska Airlinesthin sample | 79 | 87.3% | 56 min | 0.00% | A+ |
| United Airlines | 1,011 | 84.4% | 47 min | 0.49% | B+ |
| SkyWest Airlines | 3,517 | 80.7% | 60 min | 1.36% | B |
| Frontier Airlinesthin sample | 142 | 67.9% | 56 min | 1.41% | C |
No carrier stands out. United tops the table at 84.4%, 4 points clear of the bottom, which is inside the range this kind of sample moves year to year.
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 19 points, against 4 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am498 flights92.5%
- 8am–11am1,176 flights80.6%
- 11am–2pm1,015 flights80.6%
- 2pm–5pm1,026 flights73.8%
- 5pm–8pm782 flights85.2%
- 8pm–5am252 flights82.2%
Scale runs 65% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.5% of the time, against 73.8% for the afternoon window. That is 19 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on.
Across the year
When delays peak on this route
This route's year swings by 24 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.
Delays peak in May, when the on-time rate falls to 65.6%. March is the strongest month at 89.8%. Moving a flexible trip across that boundary buys 24 points.
Across the week, Saturday is the strongest day at 87.3% on time and Sunday the weakest at 77.5%. 10 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 50,000 reported delay minutes.
- 41%Late-arriving aircraft
- 30%National Airspace System
- 24%Carrier
- 5%Extreme weather
41% 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 50,000 reported delay minutes here, that single category outweighs weather by 9 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 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 92.5% on time here.
Cancellations sit at 1.16% against a national 1.80%, which is ordinary. Diversions add another 0.17%.
Connections and stage length
What a delay here actually costs
5.4% of arrivals land an hour or more late, close to the national 8.2%. 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 372 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 73.6% on time across 4,780 flights, 8 points below 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 8 points of difference.
The sample behind these figures is 4,749 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 89.8% on time and May 65.6%, a swing of 24 points. If the dates move at all, move them out of May before you think about anything else.
Common questions
SFO to SNA questions
How often is SFO to SNA 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 18.8% of the 4,749 flights in this analysis, against 22.6% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on SFO to SNA?
United Airlines leads at 84.4% on time across 1,011 flights. SkyWest Airlines is at the other end on 80.7%, a gap of 4 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 SFO to SNA?
The 5am–8am departure window is the strongest at 92.5% on time. The 2pm–5pm window is the weakest at 73.8%, 19 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 May delays on SFO to SNA?
May is the weakest month at 65.6% on time, compared with 89.8% in March. Across the year that is 24 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
- SNA to SFO — the return legseparate record
- San Francisco International (SFO) delay statistics
- John Wayne Airport (SNA) delay statistics
- Alaska Airlines on-time record87.3%
- United Airlines on-time record84.4%
- SkyWest Airlines on-time record80.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. SFO to SNA and SNA to SFO 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, June 2025 to May 2026. Updated monthly. How this data is collected.