MDW to MIA flight delays & on-time performance
Nonstop flights from Chicago Midway International Airport to Miami International Airport · 1,182 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at MDW or MIA 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 Miami (MIA) arrived on time 73% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 1.2% were cancelled, and 8% arrived an hour or more late.
- Frontier Airlines was the most punctual airline here (75% on time); Southwest Airlines was the least (73%).
- Departures scheduled around 9am did best (89% on time); around 11am did worst (50%).
- Tuesday was the most reliable day to fly (85% on time) and Saturday the least (66%).
- The largest source of delay minutes was late-arriving aircraft (37%).
Which airline is most on time from MDW to MIA?
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 | 75% | 1.6% | 21 min | 15.9% | 64 |
| Southwest Airlines | 73% | 1.1% | 15 min | 6.5% | 439 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am83%35 flights
- 7am76%71 flights
- 8am71%107 flights
- 9am89%73 flights
- 11am50%16 flights
- 12pm67%21 flights
- 2pm62%49 flights
- 3pm46%13 flights
- 5pm81%38 flights
- 6pm63%41 flights
- 7pm70%22 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday79%2.6% cancelled
- Tuesday85%0.0% cancelled
- Wednesday75%0.0% cancelled
- Thursday68%1.3% cancelled
- Friday74%0.0% cancelled
- Saturday66%1.9% cancelled
- Sunday72%1.2% 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 aircraft37%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion28%
- Extreme weather1%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather83%
- Air traffic control & airport congestion17%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
MDW to MIA: common questions
- How often are MDW to MIA flights on time?
- 73% 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 Miami cancelled?
- 1.2% of scheduled flights were cancelled (6 of 503).
- How long are typical delays?
- Across all flights the average arrival delay was 16 min (early arrivals count as zero). Flights that were late arrived 52 min behind schedule on average, and 7.7% of flights were an hour or more late.
- How long is taxi time at MDW?
- Flights on this route spent 17 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MIA to MDW — 68% 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 → MIA, nonstop flights by US airlines that report to the DOT. How we calculate this.