73% of flights from Baltimore to San Antonio arrived on time over the past 12 months. That is worse than the typical U.S. route. 9% of flights arrived more than an hour late or not at all.
How late?
The on-time rate treats a flight 20 minutes late the same as one 5 hours late. Here's the split for BWI → SAT: when a flight was late, it was under 45 minutes late 58% of the time. About 1 in 14 flights landed an hour or more late, and 1 in 91 three hours or more; 1.6% were cancelled outright.
- On time or early73%
- 15–30 min late10%
- 30–60 min late7.5%
- 1–2 hours late4.7%
- 2–3 hours late1.5%
- 3+ hours late1.1%
- Diverted0.1%
- Cancelled1.6%
Share of all 731 scheduled flights, past 12 months, by arrival time against schedule.
By airline
| Airline | Flights | On time | Cancelled | Typical arrival | 1h+ late | Avg when late | Operated by |
|---|---|---|---|---|---|---|---|
| Southwest Airlines | 731 | 73% | 1.6% | −3 min | 7.3% | +57 min | Southwest Airlines |
Airline = the name on the ticket. Regional flights (e.g. "Delta Connection") count under the ticketing airline, and the operator is listed.
Best time of day to fly
On-time rate by scheduled departure hour (local time at BWI). Delays build through the day as late planes knock on, so early flights usually do best.
Last flight of the day
On BWI → SAT, each airline's last flight of the day was cancelled 2.6% of the time, against 0.5% for its earlier flights (4.8× as often). It arrived 3+ hours late 1.1% of the time (earlier flights: 1.1%). It matters more than the numbers suggest. Miss an earlier flight and there's another one that evening; miss the last one and you're usually waiting until morning.
| Airline | Last departure | Last: cancelled | Last: 3h+ late | Earlier: cancelled | Next morning |
|---|---|---|---|---|---|
| Southwest Airlines | 7:05 p.m. | 2.6% | 1.1% | 0.5% | first flight 9:25 a.m. |
Last flight = the airline's last scheduled departure on this route that day, on days it flies the route at least twice; past 12 months. Times are typical scheduled times over the latest three months.
If you need to be in SAT tonight, book an earlier flight so there's a backup if it's cancelled.
By month
Each calendar month pooled over 2023–2026. Best: November (83%). Worst: July (60%).
By day of week
| Day | Flights | On time | Cancelled |
|---|---|---|---|
| Monday | 124 | 72% | 3.2% |
| Tuesday | 106 | 80% | 1.9% |
| Wednesday | 104 | 81% | 0.0% |
| Thursday | 119 | 77% | 0.8% |
| Friday | 123 | 73% | 0.8% |
| Saturday | 67 | — | — |
| Sunday | 88 | — | — |
Why flights were late
Share of delay minutes on flights 15+ minutes late, as reported to BTS by the airlines.
Cancellations: weather 9 · airline 3
Month by month
Not enough months with data to draw a trend.
Worst days in the past year
| Date | Flights | On time | Cancelled |
|---|---|---|---|
| Dec 27, 2025 | 3 | 0% | 1 |
| Aug 28, 2026 | 3 | 0% | 0 |
| Jun 15, 2026 | 3 | 0% | 0 |
| Jun 17, 2026 | 3 | 0% | 0 |
| Jul 28, 2026 | 3 | 0% | 1 |
Nearby airport alternatives
Other ways to make the same trip, using airports within 60 miles of Baltimore or San Antonio. IAD → SAT has been 12 points more reliable.
| Route | Flights | On time | Cancelled |
|---|---|---|---|
| BWI → SAT (this route) | 731 | 73% | 1.6% |
| IAD → SAT Washington Dulles to San Antonio | 688 | 85% | 0.6% |
Questions
How often are flights from BWI to SAT on time?
73% of 731 scheduled flights from Baltimore, MD to San Antonio, TX arrived within 15 minutes of schedule between September 2025 and August 2026. 1.6% were cancelled.
What month has the most delays from BWI to SAT?
July (60% on time). The best month is November (83%), over 2023–2026.
Is the last flight of the day from BWI to SAT more likely to be cancelled?
Yes. Each airline's last BWI–SAT flight of the day was cancelled 2.6% of the time over the past year, against 0.5% for its earlier flights. If the last flight is cancelled, the next one is usually the following morning.
Related
- SAT → BWI (return)
- Baltimore/Washington (BWI) delays by hour
- Flights into San Antonio (SAT)
- Southwest Airlines on-time record
- Connecting off this flight? Check the risk
Domestic flights by the airlines that report to the U.S. DOT, plus their regional partners. "On time" means arriving less than 15 minutes after schedule; cancelled and diverted flights count as not on time. Past performance is a guide, not a forecast. Method.