Carrier performance at one airport
OO→SAN
SkyWest Airlines at San Diego International
- Departures
- 14,980
- Period
- June 2025 to May 2026
- Routes
- 25
- Rank here
- #6 of 10
SkyWest Airlines at San Diego lands a B, 2 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 14,980 flights, of which Delta Air Lines flew 9,609 at 86.3% on time.
Measured against the airport rather than the country, SkyWest Airlines runs about a point ahead of the 78.2% weighted average across all carriers at SAN. That is the comparison worth making: every operator here works the same runways, the same airspace and the same weather.
Key figures
On time
79.4%
14,681 completed departures
Avg delay
58 min
Across delayed flights only
Cancelled
1.73%
At SAN, this carrier only
Rank here
#6
Of 10 carriers clearing the floor at SAN
These figures cover 15,000 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.
Against the competition
Every carrier at SAN, ranked
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 86.3% of the time; Hawaiian Airlines manages 58.5%. Sample sizes sit next to every figure, because a two-point gap across 562 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Delta Air Lines | 9,609 | 86.3% | 74 min | 1.09% | A |
| United Airlines | 10,464 | 81.4% | 69 min | 0.75% | B+ |
| JetBlue Airways | 1,642 | 81.1% | 105 min | 2.13% | B |
| Spirit Airlines | 539 | 81.0% | 68 min | 1.30% | B |
| American Airlines | 9,361 | 80.5% | 103 min | 1.83% | B |
| SkyWest Airlines (this page) | 14,980 | 79.4% | 58 min | 1.73% | B |
| Alaska Airlines | 12,447 | 78.4% | 58 min | 1.46% | B |
| Southwest Airlines | 37,160 | 74.7% | 51 min | 0.90% | C+ |
| Frontier Airlines | 2,332 | 70.3% | 91 min | 2.14% | C |
| Hawaiian Airlines | 562 | 58.5% | 72 min | 1.42% | D |
The spread between Delta and Hawaiian is 28 points, wide enough that it should decide the booking. On a hundred trips that is 28 more arrivals inside the on-time window.
Route by route
Where SkyWest Airlines flies from SAN
SkyWest Airlines operates 25 routes out of SAN with enough volume to report. Route records inside one carrier at one airport still spread widely, because a short shuttle and a transcontinental have very different exposure to a late inbound.
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SAN to LAX · Los Angeles | 2,280 | 88.8% | 74 min | 1.01% | A |
| SAN to LAS · Las Vegas | 1,653 | 77.2% | 68 min | 1.27% | B |
| SAN to SFO · San Francisco | 1,581 | 70.9% | 61 min | 1.58% | C |
| SAN to FAT · Fresno | 1,265 | 78.2% | 48 min | 1.90% | B |
| SAN to SMF · Sacramento | 1,194 | 78.4% | 49 min | 1.42% | B |
| SAN to SJC · San Jose | 1,170 | 81.8% | 54 min | 1.20% | B |
| SAN to AUS · Austin | 967 | 79.1% | 61 min | 1.24% | B |
| SAN to STS · Santa Rosa | 818 | 79.3% | 47 min | 3.42% | B− |
| SAN to SLC · Salt Lake City | 639 | 78.2% | 61 min | 0.78% | B+ |
| SAN to SBP · San Luis Obispo | 579 | 76.9% | 54 min | 4.49% | B− |
| SAN to MRY · Monterey | 556 | 77.8% | 42 min | 3.06% | B− |
| SAN to BOI · Boise | 426 | 86.6% | 55 min | 0.47% | A+ |
| SAN to PHX · Phoenix | 375 | 66.3% | 58 min | 5.87% | C− |
| SAN to DEN · Denverthin sample | 295 | 81.0% | 45 min | 1.69% | B |
| SAN to EUG · Eugenethin sample | 207 | 81.6% | 49 min | 0.48% | B+ |
| SAN to RNO · Renothin sample | 194 | 84.7% | 56 min | 5.15% | B− |
| SAN to RDM · Redmondthin sample | 142 | 85.6% | 35 min | 2.11% | A |
| SAN to OAK · Oaklandthin sample | 132 | 67.9% | 56 min | 0.76% | C+ |
| SAN to BZN · Bozemanthin sample | 88 | 81.6% | 68 min | 1.14% | B |
| SAN to SBA · Santa Barbarathin sample | 80 | 86.1% | 52 min | 1.25% | A |
| SAN to JAC · Jacksonthin sample | 75 | 87.8% | 64 min | 0.00% | A+ |
| SAN to MFR · Medfordthin sample | 75 | 77.3% | 68 min | 0.00% | B+ |
| SAN to HDN · Haydenthin sample | 51 | 64.0% | 94 min | 0.00% | D+ |
| SAN to EGE · Eaglethin sample | 47 | 73.9% | 72 min | 2.13% | C |
| SAN to FCA · Kalispellthin sample | 40 | 72.5% | 50 min | 0.00% | C+ |
Departure window
Best time of day for this operation
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 12 points, against 28 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am1,113 flights86.3%
- 8am–11am3,812 flights83.9%
- 11am–2pm2,635 flights74.8%
- 2pm–5pm1,922 flights76.1%
- 5pm–8pm2,607 flights78.5%
- 8pm–5am2,891 flights78.2%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
The weak window here is the middle of the day, not the evening: 11am–2pm runs 74.8% on time against 86.3% for 5am–8am. That shape usually means a departure bank rather than an accumulating delay, so the recovery later in the afternoon is real rather than noise.
Across the year
Seasonal pattern
December is the weak month at 72.8% on time, against 85.5% in January. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days.
Delay causes
What holds this operation up
- 39%Late-arriving aircraft
- 29%National Airspace System
- 26%Carrier
- 7%Extreme weather
- 0%Security
39% 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 174,000 reported delay minutes here, that single category outweighs weather by 6 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.
Cancellations sit at 1.73% against a national 1.80%, which is ordinary. Diversions add another 0.27%.
6.4% 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.
14,980 flights sit behind these numbers, which is a large enough sample that the headline rate is not moving on noise. Where a sub-group falls below 30 flights the site shows a dash instead of a percentage.
Put together: the calendar is the biggest lever here, not the carrier or the hour. January runs 85.5% on time and December 72.8%, a swing of 13 points. If the dates move at all, move them out of December before you think about anything else.
Common questions
SkyWest Airlines at SAN
How often is SkyWest Airlines at 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 20.6% of the 14,980 flights in this analysis, against 22.6% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on SkyWest Airlines at SAN?
Delta Air Lines leads at 86.3% on time across 9,609 flights. Hawaiian Airlines is at the other end on 58.5%, a gap of 28 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 SkyWest Airlines at SAN?
The 5am–8am departure window is the strongest at 86.3% on time. The 11am–2pm window is the weakest at 74.8%, 12 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 December delays on SkyWest Airlines at SAN?
December is the weakest month at 72.8% on time, compared with 85.5% in January. Across the year that is 13 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
Source: US DOT Bureau of Transportation Statistics, on-time performance data, June 2025 to May 2026. Updated monthly. How this data is collected.