Airport month record
SATAUG
San Antonio International in August 2025
- Departures
- 3,444
- Month
- August 2025
- National, same month
- 77.4%
- Carriers
- 9
Historical statistics for August 2025, not live status or a forecast for this year’s August. For today’s conditions at SAT, see live FAA status.
SAT in August lands a B, 4 points better than the national rate of 77.4%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That is a workable record, not a spotless one. That rests on 3,444 flights, of which Delta Air Lines flew 603 at 87.6% on time.
Delta Air Lines is the most reliable of the four carriers covered here at 87.6% on time across 603 flights.
Key figures
On time
81.5%
Arrivals under 15 minutes late, of 3,386 completed departures
Avg delay
79 min
Across delayed arrivals only, not all flights
Cancelled
1.19%
Nationally in August: 1.08%
Whole year
81.8%
SAT across all twelve months
These figures cover 3,444 departures from San Antonio International in August 2025. On time means an arrival less than 15 minutes after the scheduled gate time, the DOT's threshold, and the national comparison uses every US departure in the same month rather than the whole year.
Against the year
August next to SAT's other months
Against SAT's own year, August ran level with the twelve-month rate of 81.8%, which makes it number eight of twelve months, best first. Either side of it, July ran 76.4% on time and September 85.6%, so this month sits in line with its neighbours.
| Month | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| July 2025 | 3,699 | 76.4% | 77 min | 1.49% | B |
| August 2025 (this page) | 3,444 | 81.5% | 79 min | 1.19% | B |
| September 2025 | 3,334 | 85.6% | 71 min | 0.63% | A+ |
| October 2025 | 3,656 | 83.7% | 68 min | 0.38% | B+ |
| November 2025 | 3,440 | 84.1% | 67 min | 1.19% | B |
| December 2025 | 3,588 | 83.7% | 66 min | 0.72% | B+ |
| January 2026 | 2,921 | 84.8% | 96 min | 3.70% | B− |
| February 2026 | 2,671 | 86.3% | 67 min | 1.27% | A |
| March 2026 | 3,439 | 79.9% | 74 min | 1.37% | B |
| April 2026 | 3,384 | 82.6% | 66 min | 0.74% | B+ |
| May 2026 | 3,485 | 80.7% | 79 min | 1.38% | B |
| June 2026 | 3,393 | 73.5% | 81 min | 1.65% | C |
Departure window
The best time of day to leave SAT in August
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 28 points, against 14 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am989 flights92.6%
- 8am–11am498 flights87.9%
- 11am–2pm639 flights83.1%
- 2pm–5pm686 flights74.4%
- 5pm–8pm515 flights64.9%
- 8pm–5am117 flights67.5%
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 64.9% on time, against 92.6% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 989 flights scheduled in it.
Across the week, Tuesday is the strongest day at 88.8% on time and Thursday the weakest at 77.9%. 11 points is a smaller lever than departure hour, but it is free.
Carrier by carrier
Which airlines ran best at SAT in August
The choice of carrier is not cosmetic here. Delta Air Lines arrives on time 87.6% of the time; American Airlines manages 74.1%. Sample sizes sit next to every figure, because a two-point gap across 651 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,294 | 84.0% | 53 min | 0.31% | B+ |
| American Airlines | 651 | 74.1% | 105 min | 3.38% | C− |
| Delta Air Lines | 603 | 87.6% | 67 min | 0.50% | A+ |
| United Airlines | 490 | 81.9% | 83 min | 1.63% | B |
| Spirit Airlinesthin sample | 120 | 76.5% | 103 min | 0.00% | B+ |
| SkyWest Airlinesthin sample | 110 | 83.5% | 110 min | 0.00% | B+ |
| Envoy Airthin sample | 68 | 69.2% | 126 min | 2.94% | C |
| Alaska Airlinesthin sample | 57 | 71.4% | 43 min | 1.75% | C |
| Frontier Airlinesthin sample | 51 | 72.0% | 82 min | 1.96% | C |
American Airlines cancels 3.4% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Route by route
Busiest routes out of SAT in August
| Route | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| SAT to DFW · Dallas-Fort Worth | 383 | 66.8% | 111 min | 4.18% | C− |
| SAT to ATL · Atlantathin sample | 269 | 86.3% | 61 min | 0.74% | A+ |
| SAT to DEN · Denverthin sample | 240 | 75.7% | 74 min | 1.67% | B |
| SAT to DAL · Dallasthin sample | 218 | 85.3% | 66 min | 0.46% | A+ |
| SAT to IAH · Houstonthin sample | 208 | 79.0% | 68 min | 1.44% | B |
| SAT to LAX · Los Angelesthin sample | 182 | 92.2% | 74 min | 0.00% | A+ |
| SAT to PHX · Phoenixthin sample | 174 | 82.0% | 91 min | 0.57% | B+ |
| SAT to LAS · Las Vegasthin sample | 161 | 87.0% | 82 min | 0.00% | A+ |
| SAT to ORD · Chicagothin sample | 154 | 73.5% | 75 min | 3.25% | C− |
| SAT to HOU · Houstonthin sample | 144 | 78.3% | 48 min | 0.00% | B+ |
| SAT to CLT · Charlottethin sample | 115 | 85.1% | 124 min | 0.87% | A+ |
| SAT to DTW · Detroitthin sample | 97 | 93.8% | 126 min | 0.00% | A+ |
| SAT to MSP · Minneapolisthin sample | 83 | 78.0% | 56 min | 1.20% | B |
| SAT to MCO · Orlandothin sample | 82 | 72.8% | 57 min | 0.00% | C+ |
| SAT to SLC · Salt Lake Citythin sample | 82 | 85.4% | 71 min | 0.00% | A+ |
| SAT to BNA · Nashvillethin sample | 79 | 89.9% | 74 min | 0.00% | A+ |
| SAT to ELP · El Pasothin sample | 73 | 80.8% | 57 min | 0.00% | B+ |
| SAT to BWI · Baltimorethin sample | 71 | 87.0% | 45 min | 2.82% | A |
| SAT to MDW · Chicagothin sample | 60 | 85.0% | 59 min | 0.00% | A+ |
| SAT to SAN · San Diegothin sample | 57 | 86.0% | 57 min | 0.00% | A+ |
| SAT to SEA · Seattlethin sample | 57 | 71.4% | 43 min | 1.75% | C |
| SAT to IAD · Washingtonthin sample | 51 | 98.0% | 65 min | 0.00% | A+ |
| SAT to STL · St. Louisthin sample | 47 | 91.5% | 21 min | 0.00% | A+ |
| SAT to MIA · Miamithin sample | 36 | 94.3% | 30 min | 2.78% | A |
| SAT to TPA · Tampathin sample | 34 | 85.3% | 60 min | 0.00% | A+ |
Delay causes
What held SAT up in August
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 49,000 reported delay minutes.
- 41%Late-arriving aircraft
- 31%Carrier
- 21%National Airspace System
- 7%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 49,000 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. The split is drawn from 49,316 reported delay minutes.
Cancellations sit at 1.19% against a national 1.08%, which is ordinary. Diversions add another 0.49%.
7.0% 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 last a little over an hour, which a normal layover absorbs.
What to do with this
Flying from SAT in August
For a August trip through SAT: expect 81.5% on time and 1.19% cancelled, going by August 2025. The 5am–8am window was the strongest part of the day.
Related
Where to go next
- San Antonio International (SAT), the whole year
- SAT in July76.4%
- SAT in September85.6%
- SAT in October83.7%
- SAT in November84.1%
- SAT in December83.7%
- SAT in January84.8%
- SAT in February86.3%
- SAT in March79.9%
- SAT in April82.6%
- SAT in May80.7%
- SAT in June73.5%
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.