MDW to SAT flight delays & on-time performance
Nonstop flights from Chicago Midway International Airport to San Antonio International Airport · 1,036 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MDW or SAT right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Chicago (MDW) to San Antonio (SAT) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.2% were cancelled, and 7% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 7am did best (88% on time); around 9pm did worst (62%).
- Wednesday was the most reliable day to fly (88% on time) and Tuesday the least (67%).
- The largest source of delay minutes was late-arriving aircraft (50%).
Which airline is most on time from MDW to SAT?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 77% | 1.2% | 14 min | 7.2% | 661 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 7am88%89 flights
- 8am84%91 flights
- 9am79%19 flights
- 10am80%135 flights
- 11am79%14 flights
- 3pm73%11 flights
- 4pm88%24 flights
- 5pm78%18 flights
- 7pm87%30 flights
- 8pm77%48 flights
- 9pm62%142 flights
- 10pm67%25 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday75%1.0% cancelled
- Tuesday67%1.1% cancelled
- Wednesday88%1.1% cancelled
- Thursday87%1.1% cancelled
- Friday74%2.0% cancelled
- Saturday76%1.2% cancelled
- Sunday74%1.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft50%
- Airline (crew, maintenance, cleaning, fueling)32%
- Air traffic control & airport congestion17%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather63%
- Airline (crew, maintenance, cleaning, fueling)25%
- Air traffic control & airport congestion13%
- Security0%
MDW to SAT: common questions
- How often are MDW to SAT flights on time?
- 77% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Chicago to San Antonio cancelled?
- 1.2% of scheduled flights were cancelled (8 of 661).
- How long are typical delays?
- Across all flights the average arrival delay was 14 min (early arrivals count as zero). Flights that were late arrived 55 min behind schedule on average, and 7.2% of flights were an hour or more late.
- How long is taxi time at MDW?
- Flights on this route spent 16 min taxiing from the gate to takeoff on average.
Related routes
Return trip: SAT to MDW — 77% on time
More flights from Chicago
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: MDW → SAT, nonstop flights by US airlines that report to the DOT. How we calculate this.