MDW to IAH flight delays
Chicago, IL (MDW) Houston, TX (IAH) · 917 miles
393 flights · July 2024 – July 2026 · US Bureau of Transportation Statistics
66.41%
Arrived on time
Within 15 minutes of schedule
1.53%
Cancelled
Share of scheduled flights
65 min
When late, late by
Average across delayed arrivals
23 min
Delay per flight
Averaged over every flight flown
What the record says about this route
The season swings this route hard. In October it ran 41.1 points more punctual than in July — a difference bigger than the one between the best and worst airlines on most routes. If the date is flexible, it is worth more than the carrier.
The route has been getting better. The later months in the record run 20.6 points more punctual than the earlier ones, which usually means a schedule that was too tight has been given more room.
This is a late route. Flights from Chicago to Houston miss their scheduled arrival often enough that a tight connection at the far end is a connection at risk.
This route does worse than its own airport. MDW as a whole runs 8.6 points more punctual than these flights, which points at something specific to the route — the time of day it is scheduled, or the aircraft that feed it — rather than the airport.
Which airline should you fly on this route?
Over July 2024 – July 2026, Frontier Airlines arrived on time most often on MDW to IAH. Flights ran closest to schedule in October and worst in January.
Every airline on MDW to IAH
Ranked by how many flights each one operated. A carrier with fewer than 100 flights in the period is listed but not graded.
| Airline | Flights | On time | Cancelled | Avg delay | Grade |
|---|---|---|---|---|---|
| Frontier Airlines | 340 | 68.55% | 0.88% | 65 min | D |
| Southwest Airlines | 53 | 52% | 5.66% | 66 min | — |
Month by month
Share of flights that arrived within 15 minutes of schedule, by month flown.
The return leg
IAH to MDW Houston back to Chicago 68.56% on time DOther routes from Chicago
Common questions
Are flights from Chicago to Houston usually delayed?
66.41% of flights on the MDW to IAH route arrived within 15 minutes of schedule, so roughly 3 in every ten arrived late. That is worse than the average route in this record.
Which airlines fly from Chicago to Houston?
Only Frontier Airlines appears in the published record on this route, with 340 flights and 68.55% arriving on time.
How often are MDW to IAH flights cancelled?
1.53% of scheduled flights did not operate — about 15 in every thousand. That is in the normal range.
What is the best month to fly Chicago to Houston?
October, when 95.2% of flights arrived on time. The worst was July at 54.1%.
When MDW to IAH flights are late, how late are they?
About 65 minutes on average across the flights that arrived more than 15 minutes behind schedule.
What these figures do and do not tell you
Everything on this page is counted from the flights that actually operated on MDW to IAH during July 2024 – July 2026, as reported by the airlines to the US Bureau of Transportation Statistics. "On time" is the federal definition: arriving at the gate within 15 minutes of the scheduled time.
A route's record is a description of the past, not a forecast. Weather, air traffic control and the aircraft's earlier flights that day drive most delays, and none of them are predictable from a historical rate. What the record does tell you is whether this route runs late more often than others, and which carrier on it has the better history — which is the part you can actually act on when you book.
Cancellations are counted separately from delays because they are a different problem for a traveller: a late flight still gets you there. How the grade is calculated →