SAT to MDW flight delays & on-time performance
Nonstop flights from San Antonio International Airport to Chicago Midway International Airport · 1,036 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at SAT or MDW right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from San Antonio (SAT) to Chicago (MDW) arrived on time 77% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.1% were cancelled, and 6% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 5am did best (94% on time); around 3pm did worst (49%).
- Friday was the most reliable day to fly (84% on time) and Sunday the least (64%).
- The largest source of delay minutes was late-arriving aircraft (49%).
Which airline is most on time from SAT to MDW?
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% | 1.1% | 12 min | 5.5% | 661 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am94%50 flights
- 6am90%136 flights
- 7am100%10 flights
- 9am88%107 flights
- 11am82%11 flights
- 2pm70%199 flights
- 3pm49%105 flights
- 4pm76%18 flights
- 6pm80%10 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday73%1.0% cancelled
- Tuesday83%0.0% cancelled
- Wednesday79%1.1% cancelled
- Thursday73%1.1% cancelled
- Friday84%0.0% cancelled
- Saturday83%3.6% cancelled
- Sunday64%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 aircraft49%
- Airline (crew, maintenance, cleaning, fueling)27%
- Air traffic control & airport congestion22%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather86%
- Airline (crew, maintenance, cleaning, fueling)14%
- Air traffic control & airport congestion0%
- Security0%
SAT to MDW: common questions
- How often are SAT to MDW 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 San Antonio to Chicago cancelled?
- 1.1% of scheduled flights were cancelled (7 of 661).
- How long are typical delays?
- Across all flights the average arrival delay was 12 min (early arrivals count as zero). Flights that were late arrived 44 min behind schedule on average, and 5.5% of flights were an hour or more late.
- How long is taxi time at SAT?
- Flights on this route spent 11 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MDW to SAT — 77% on time
More flights from San Antonio
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: SAT → MDW, nonstop flights by US airlines that report to the DOT. How we calculate this.