ATL to MDW flight delays & on-time performance
Nonstop flights from Hartsfield Jackson Atlanta International Airport to Chicago Midway International Airport · 591 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at ATL or MDW right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Atlanta (ATL) to Chicago (MDW) arrived on time 76% of the time in Aug 2025 – Jul 2026, worse than the 78% national average.
- 2% were cancelled, and 8% arrived an hour or more late.
- Delta Air Lines was the most punctual airline here (82% on time); Frontier Airlines was the least (65%).
- Departures scheduled around 6am did best (96% on time); around 7pm did worst (52%).
- Wednesday was the most reliable day to fly (83% on time) and Sunday the least (71%).
- The largest source of delay minutes was late-arriving aircraft (48%).
Which airline is most on time from ATL 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 |
|---|---|---|---|---|---|
| Delta Air Lines | 82% | 2.4% | 11 min | 5.3% | 1,362 |
| Southwest Airlines | 75% | 1.5% | 16 min | 7.1% | 1,543 |
| Frontier Airlines | 65% | 2.4% | 33 min | 16.3% | 621 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 6am96%170 flights
- 7am80%82 flights
- 8am84%382 flights
- 9am85%134 flights
- 10am81%213 flights
- 11am86%393 flights
- 12pm83%162 flights
- 1pm88%83 flights
- 2pm76%94 flights
- 3pm79%338 flights
- 4pm72%211 flights
- 5pm68%176 flights
- 6pm71%182 flights
- 7pm52%174 flights
- 8pm64%148 flights
- 9pm64%459 flights
- 10pm74%125 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday73%1.9% cancelled
- Tuesday80%1.0% cancelled
- Wednesday83%0.6% cancelled
- Thursday77%0.9% cancelled
- Friday74%1.6% cancelled
- Saturday77%3.8% cancelled
- Sunday71%4.6% 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 aircraft48%
- Airline (crew, maintenance, cleaning, fueling)34%
- Air traffic control & airport congestion16%
- Extreme weather3%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Airline (crew, maintenance, cleaning, fueling)51%
- Extreme weather44%
- Air traffic control & airport congestion6%
- Security0%
ATL to MDW: common questions
- How often are ATL to MDW flights on time?
- 76% 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 Atlanta to Chicago cancelled?
- 2.0% of scheduled flights were cancelled (71 of 3,526).
- How long are typical delays?
- Across all flights the average arrival delay was 17 min (early arrivals count as zero). Flights that were late arrived 66 min behind schedule on average, and 8.0% of flights were an hour or more late.
- How long is taxi time at ATL?
- Flights on this route spent 15 min taxiing from the gate to takeoff on average.
Related routes
Return trip: MDW to ATL — 79% on time
More flights from Atlanta
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: ATL → MDW, nonstop flights by US airlines that report to the DOT. How we calculate this.