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2 nonstop, 38 with 1 connection, 6 with 2 · ranked by overall best · 10 hidden by your Most reliable time setting (they leave at other times of day) · showing the top 3
Most reliable time: morning departures (5–11 AM), the window with the best on-time odds for this trip. Turn off “Most reliable” under Departure time in Advanced settings to see every time.
36 matching trips
Why this is our top pick
- This morning flight leaves in the most reliable time of day on this route: its best departures have a 74% reliability rating vs 57% for afternoon departures.
- Compared with the next-best option (United 1898 + United 468 on the Boeing 737-900ER or 737-900), it flies a newer plane (about 4 vs 24 years old).
- Legroom was comparable across the flights we compared (30–31 in), so it didn't set them apart.
6:05 AM1:08 PMBWI → SAT
United · UA 1898 / UA 468
7h 55m1 stop
3h 07m in IAH
One ticket
84%arrive on time96% connections madeCheck fares
5:40 AM11:25 AMBWI → SAT
Delta · DL 2601 / DL 788
6h 34m1 stop
1h 33m in DTW
One ticket
82%arrive on time94% connections madeCheck fares
Aircraft and legroom reflect the planes each flight has flown recently. Airlines can swap planes and seat maps change, so check the airline’s seat map when you book.
BWI → SAT
Baltimore to San Antonio: 748 nonstop flights a year
On time (12 months)
77%
Cancelled
1.3%
avg delay 16 min
Best time to leave
Before 9 AM
90% on time vs 64% 3 to 6 PM
Most reliable airline
Southwest
76% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines76%
738 flights · 77% on time as flown · 1.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
163 flights · avg delay 6 min
- 9 AM to noon88%
138 flights · avg delay 6 min
- Noon to 3 PM82%
72 flights · avg delay 10 min
- 3 to 6 PM64%
96 flights · avg delay 33 min
- 6 to 9 PM68%
252 flights · avg delay 23 min
Best day: Wednesday (80%). Worst: Saturday (67%).
Smarter routing
Nearby airports that run more on time
IAD → SAT 84% chance on time
Washington Dulles International Airport to San Antonio International Airport · 636 flights a year · 45 mi from your airports · yours: 76%
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