IAH to MDW flight delays & on-time performance
Nonstop flights from George Bush Intercontinental Airport to Chicago Midway International Airport · 917 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at IAH or MDW right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Houston (IAH) to Chicago (MDW) arrived on time 72% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.8% were cancelled, and 15% arrived an hour or more late.
- Frontier Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 10am did best (79% on time); around 7pm did worst (39%).
- Friday was the most reliable day to fly (91% on time) and Monday the least (59%).
- The largest source of delay minutes was late-arriving aircraft (56%).
Which airline is most on time from IAH 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 |
|---|---|---|---|---|---|
| Frontier Airlines | 72% | 1.8% | 35 min | 15.3% | 113 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 10am79%28 flights
- 1pm86%14 flights
- 6pm68%28 flights
- 7pm39%20 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday59%3.0% cancelled
- Tuesday100%0.0% cancelled
- Wednesday0%0.0% cancelled
- Thursday80%0.0% cancelled
- Friday91%0.0% cancelled
- Saturday86%12.5% cancelled
- Sunday60%0.0% 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 aircraft56%
- Airline (crew, maintenance, cleaning, fueling)36%
- Air traffic control & airport congestion8%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather100%
- Airline (crew, maintenance, cleaning, fueling)0%
- Air traffic control & airport congestion0%
- Security0%
IAH to MDW: common questions
- How often are IAH to MDW flights on time?
- 72% 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 Houston to Chicago cancelled?
- 1.8% of scheduled flights were cancelled (2 of 113).
- How long are typical delays?
- Across all flights the average arrival delay was 35 min (early arrivals count as zero). Flights that were late arrived 122 min behind schedule on average, and 15.3% of flights were an hour or more late.
- How long is taxi time at IAH?
- Flights on this route spent 21 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MDW to IAH — 78% on time
More flights from Houston
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: IAH → MDW, nonstop flights by US airlines that report to the DOT. How we calculate this.