Route reliability record
DEN→SNA
Denver to Santa Ana
- Flights
- 3,710
- Period
- September 2025 to August 2026
- Distance
- 846 mi
- Carriers
- 3
This route 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 45 minutes on average. That rests on 3,710 DEN to SNA flights, of which United Airlines flew 1,901 at 85.3% on time.
Best time to fly DEN to SNA: a 5am–8am departure, ideally on a Tuesday. Flights in that window arrived on time 94.4% of the time and Tuesday flights 84.9%, against 80.6% for the route overall.
The US average over the same twelve months is 77.3%, 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
80.6%
Arrivals under 15 minutes late, of 3,696 completed flights
Avg delay
45 min
Across delayed arrivals only, not all flights
Cancelled
0.16%
National rate is 1.89%
Best carrier
United
85.3% on time across 1,901 flights
These figures cover 3,710 flights between September 2025 and August 2026. The median arrival is 5 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
Which airline is most reliable on DEN to SNA
The choice of carrier is not cosmetic here. United Airlines arrives on time 85.3% of the time; Southwest Airlines manages 72.7%. Sample sizes sit next to every figure, because a two-point gap across 1,538 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Frontier Airlinesthin sample | 271 | 91.9% | 68 min | 0.37% | A+ |
| United Airlines | 1,901 | 85.3% | 48 min | 0.16% | A+ |
| Southwest Airlines | 1,538 | 72.7% | 43 min | 0.13% | C+ |
The spread between United and Southwest is 13 points, wide enough that it should decide the booking. On a hundred trips that is 13 more arrivals inside the on-time window.
Flight by flight
Flights on DEN to SNA
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.
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Best ways to make this trip
The most reliable ways to fly Denver to Santa Ana
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. 4 of the top 5 use a different airport at one end.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. DEN → SNADenver to Santa Ana | United Airlines | 85.2% | 85.3% | 0.16% | 5am–8am, Tue | UA 2666 07:40 |
| 2. DEN → LAXDenver to Los Angeles | United Airlines | 84.0% | 84.0% | 0.00% | 5am–8am, Sat | UA 1638 08:00 |
| 3. DEN → LAXDenver to Los Angeles | Frontier Airlines | 82.8% | 83.4% | 0.75% | 5am–8am, Sun | F9 2341 06:00 |
| 4. DEN → LAXDenver to Los Angeles | Delta Air Lines | 80.1% | 81.2% | 1.34% | 5am–8am, Mon | DL 2002 07:25 |
| 5. DEN → ONTDenver to Ontario | Frontier Airlines | 79.9% | 80.3% | 0.54% | 5am–8am, Sun | F9 1261 22:29 |
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 24 points, against 13 points between the best and worst carrier.
- 5am–8am199 flights94.4%
- 8am–11am884 flights89.8%
- 11am–2pm853 flights84.3%
- 2pm–5pm554 flights77.1%
- 5pm–8pm732 flights70.1%
- 8pm–5am488 flights71.4%
Scale runs 60% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 94.4% of the time, against 70.1% for the evening window. That is 24 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 8am–11am window is the busiest, with 884 flights scheduled in it.
Explore
Filter DEN to SNA by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On DEN to SNA, the best departure window is 5am–8am at 94.4% on time and the worst is 5pm–8pm at 70.1%, a wide gap of 24.3 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am94.4%
- 8–11am89.8%
- 11am–2pm84.3%
- 2–5pm77.1%
- 5–8pm70.1%
- 8pm–5am71.4%
best all US flightsScale 60% to 100%.
Across the year
When delays peak on this route
This route's year swings by 23 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.
June is the worst month at 66.7% on time, 23 points below November, the best at 89.2%. 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 336 flights.
Across the week, Tuesday is the strongest day at 84.9% on time and Thursday the weakest at 77.1%, a spread of 8 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 49% of the 33,000 delay minutes carriers reported here, and the remaining four split what is left.
- 49%Late-arriving aircraft
- 34%Carrier
- 16%National Airspace System
- 1%Extreme weather
- 0%Security
49% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 33,000 reported delay minutes here, that single category outweighs weather by 49 to one. The split is drawn from 32,557 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 94.4% on time here.
Cancellations are rare at 0.16%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
Badly late arrivals are rare here: only 4.1% land an hour or more behind schedule, against 8.3% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.
The 846 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 83.4% on time across 3,714 flights, within 3 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 3,710 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 SNA 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. November runs 89.2% on time and June 66.7%, a swing of 23 points. If the dates move at all, move them out of June before you think about anything else. 3,696 completed flights over 12 months sit behind that.
Common questions
DEN to SNA questions
How often is DEN to SNA 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 19.4% of the 3,710 flights in this analysis, against 22.7% nationally. Delayed flights are late by about 45 minutes on average.
Which airline is most reliable on DEN to SNA?
United Airlines leads at 85.3% on time across 1,901 flights. Southwest Airlines is at the other end on 72.7%, a gap of 13 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 DEN to SNA?
The 5am–8am departure window is the strongest at 94.4% on time. The 5pm–8pm window is the weakest at 70.1%, 24 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 June delays on DEN to SNA?
June is the weakest month at 66.7% on time, compared with 89.2% in November. Across the year that is 23 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 DEN — the return legseparate record
- Denver International (DEN) delay statistics
- John Wayne Airport (SNA) delay statistics
- Frontier Airlines on DEN to SNA91.9%
- United Airlines on DEN to SNA85.3%
- Southwest Airlines on DEN to SNA72.7%
- DEN to PHX, a related route75.6%
- SFO to SNA, a related route77.4%
- DEN to SLC, a related route78.2%
- Frontier Airlines on-time record91.9%
- United Airlines on-time record85.3%
- Southwest Airlines on-time record72.7%
- Why the first flight of the morning is statistically safest
- Same route, different airline: where the carrier you pick matters most
Direction matters. DEN to SNA and SNA to DEN are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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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.