Carrier route record

UADEN→SNA

United Airlines · Denver to Santa Ana

Flights: 1,870
Period: July 2025 to June 2026
Share of route: 51%
Carriers: 3

Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with United Airlines.

United on DEN to SNA earns a B+. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 7 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 50 minutes. That rests on 1,870 flights, with a median arrival 7 minutes early.

Set against the rest of the country, United's DEN to SNA record is 7 points better than the US average of 77.6%. That gap is worth roughly 72 fewer late arrivals for every thousand flights.

On time

84.8%

Arrivals under 15 minutes late, of 1,854 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

0.32%

National rate is 1.81%

Whole route

80.1%

Every carrier on DEN to SNA, 3,696 flights

These figures cover 1,870 flights between July 2025 and June 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

United against every carrier on DEN to SNA

United flew 1,870 of the 3,696 flights on DEN to SNA, most of the route. Its 84.8% on time is 5 points better than the route as a whole, which runs 80.1%. Ranked by on-time rate it is number two of three carriers on the route, where the range runs from Frontier at 86.9% to Southwest at 73.1%. 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.

On-time performance by carrier on DEN to SNA
Airline	Flights	On time	Avg delay	Cancelled	Grade
Frontier Airlinesthin sample	292	86.9%	58 min	0.34%	A+
United Airlines (this page)	1,870	84.8%	49 min	0.32%	B+
Southwest Airlines	1,534	73.1%	44 min	0.39%	C+

Flight by flight

United flight numbers on DEN to SNA

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 15 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–8am57 flights94.6%
8am–11am307 flights92.1%
11am–2pm555 flights85.1%
2pm–5pm346 flights82.3%
5pm–8pm347 flights79.9%
8pm–5am258 flights83.3%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

Book the early departure. Flights leaving between 5am–8am arrive on time 94.6% of the time, against 79.9% 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 11am–2pm window is the busiest, with 555 flights scheduled in it.

Across the year

United on DEN to SNA through the year

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

July is the worst month at 67.6% on time, 25 points below November, the best at 92.9%. 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. July was the busiest month here, with 181 flights.

Across the week, Tuesday is the strongest day at 88.7% on time and Monday the weakest at 81.2%. 8 points is a smaller lever than departure hour, but it is free.

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 14,000 reported delay minutes.

Carrier
40%
Late-arriving aircraft
38%
National Airspace System
19%
Extreme weather
2%

38% 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 14,000 reported delay minutes here, that single category outweighs weather by 17 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 13,836 reported delay minutes.

The largest share of delay minutes, 40%, 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 5,599 of the 14,000 delay minutes reported here.

Cancellations are rare at 0.32%, below the national 1.81% 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 costs

Badly late arrivals are rare here: only 3.6% land an hour or more behind schedule, against 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

The return leg runs 86.1% on time across 1,870 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 1,870 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 DEN to SNA

Put together: the calendar is the biggest lever here, not the carrier or the hour. November runs 92.9% on time and July 67.6%, a swing of 25 points. If the dates move at all, move them out of July before you think about anything else. 1,854 completed flights over 12 months sit behind that.

Where to go next

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.

Key figures