MDW to IAH flight delays & on-time performance
Nonstop flights from Chicago Midway International Airport to George Bush Intercontinental Airport · 917 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MDW or IAH 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 Houston (IAH) arrived on time 78% of the time in Aug 2025 – Jul 2026, in line with the national average.
- 1.8% were cancelled, and 14% arrived an hour or more late.
- Frontier Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 6am did best (86% on time); around 4pm did worst (53%).
- Friday was the most reliable day to fly (94% on time) and Monday the least (63%).
- The largest source of delay minutes was late-arriving aircraft (61%).
Which airline is most on time from MDW to IAH?
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 | 78% | 1.8% | 23 min | 13.5% | 113 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am86%28 flights
- 9am100%12 flights
- 10am86%14 flights
- 2pm68%22 flights
- 3pm70%12 flights
- 4pm53%15 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday63%3.0% cancelled
- Tuesday100%0.0% cancelled
- Wednesday33%0.0% cancelled
- Thursday93%0.0% cancelled
- Friday94%0.0% cancelled
- Saturday86%12.5% cancelled
- Sunday70%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 aircraft61%
- Airline (crew, maintenance, cleaning, fueling)29%
- Air traffic control & airport congestion10%
- 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%
MDW to IAH: common questions
- How often are MDW to IAH flights on time?
- 78% 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 Houston cancelled?
- 1.8% of scheduled flights were cancelled (2 of 113).
- How long are typical delays?
- Across all flights the average arrival delay was 23 min (early arrivals count as zero). Flights that were late arrived 103 min behind schedule on average, and 13.5% of flights were an hour or more late.
- How long is taxi time at MDW?
- Flights on this route spent 18 min taxiing from the gate to takeoff on average.
Related routes
Return trip: IAH to MDW — 72% 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 → IAH, nonstop flights by US airlines that report to the DOT. How we calculate this.