Route on-time record
SAT to BWI: most on-time flights and the best time to fly
San Antonio (San Antonio International Airport) to Baltimore (Baltimore/Washington International Thurgood Marshall Airport). 748 nonstop flights in Jun 2025 to May 2026, 81% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was Southwest 1575 at 5:00 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
SAT → BWI
San Antonio to Baltimore: 748 nonstop flights a year
On time (12 months)
81%
Cancelled
1.9%
avg delay 12 min
Best time to leave
Before 9 AM
94% on time vs 64% 3 to 6 PM
Most reliable airline
Southwest
80% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · Southwest 1575
5:00 AM → 9:20 AM3h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
91%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 93% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 64%).
Limited track record · 54 flights
Find Southwest 1575 fares Opens this date on Aviasales#2 · Southwest 1030
4:30 PM → 8:50 PM3h 20m nonstop
Local times, typical schedule. Last flown 2026-05-29.
71%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 77% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Leaves in this route's least on-time window (3 to 6 PM: 64% on time; Before 9 AM: 94%).
Limited track record · 39 flights
Find Southwest 1030 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines80%
738 flights · 82% on time as flown · 1.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
350 flights · avg delay 4 min
- 9 AM to noon82%
97 flights · avg delay 11 min
- 3 to 6 PM64%
267 flights · avg delay 22 min
Best day: Tuesday (86%). Worst: Sunday (81%).
Smarter routing
Nearby airports that run more on time
SAT → IAD 93% chance on time
San Antonio International Airport to Washington Dulles International Airport · 636 flights a year · 45 mi from your airports · yours: 80%
SAT → DCA 88% chance on time
San Antonio International Airport to Ronald Reagan Washington National Airport · 352 flights a year · 30 mi from your airports · yours: 80%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft43%
- Air traffic control and airport volume29%
- Airline (crew, maintenance, boarding)22%
- Severe weather6%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
SAT to BWI questions
- What time of day is best to fly SAT to BWI?
- Before 9 AM: 94% of flights arrived on time, against 64% for departures 3 to 6 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from SAT to BWI?
- Southwest, with a season-adjusted 80% chance of operating and arriving on time over 738 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on SAT to BWI?
- July (71% on time); the best was February (90%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from SAT
- BWI to SAT (return)
- SAT to DFW 77%
- SAT to ATL 85%
- SAT to DEN 81%
- SAT to DAL 84%
- SAT to PHX 83%
- SAT to IAH 81%
- SAT to LAS 83%
- SAT to ORD 76%
- SAT to LAX 87%
- SAT to HOU 74%
- SAT to CLT 86%
- SAT to MCO 77%
Most on-time flights from SAT on every route →
Live status: FAA delays and ground stops