Best Time to Fly MDW to ATL: On-Time Stats by Hour & Airline
Chicago Midway International → Hartsfield-Jackson Atlanta International
Data through July 2026 · Last updated October 18, 2026
Over the last 12 months, 79.5% of Chicago (MDW) to Atlanta (ATL) flights arrived on time (3,527 scheduled flights). That is 1.8 points above the national average of 77.6%.
Delta Air Lines was the most punctual of the 3 airlines on the route at 87.5%, while Frontier Airlines trailed at 71.0%.
October has been the best month (89% on time) and Sunday the weakest day of the week (76%).
2.1% of flights were cancelled, versus 1.8% nationally.
MDW to ATL on-time performance by airline
Last 12 months. Airlines with fewer than 30 completed flights are marked “limited data”.
| Airline | On time | Avg delay when late | Cancelled | Flights |
|---|---|---|---|---|
| Delta Air Lines | 87.5% | 96 min | 2.8% | 1,362 |
| Southwest Airlines | 75.9% | 56 min | 1.2% | 1,544 |
| Frontier Airlines | 71.0% | 52 min | 2.6% | 621 |
80%+ good 70–79.9% fair <70% poor
Best time of day to fly MDW to ATL
On-time arrival % by scheduled departure hour (local time), 7,279 flights over 24 months.
Show the numbers
| Departure hour | On time | Cancelled | Flights |
|---|---|---|---|
| 5am–6am | 96.2% | 0.0% | 53 |
| 6am–7am | 83.4% | 2.1% | 1,277 |
| 7am–8am | 88.4% | 1.5% | 410 |
| 8am–9am | 88.1% | 0.9% | 323 |
| 9am–10am | 89.7% | 1.2% | 343 |
| 10am–11am | 88.3% | 1.5% | 744 |
| 11am–12pm | 78.0% | 0.7% | 300 |
| 12pm–1pm | 82.2% | 2.0% | 933 |
| 1pm–2pm | 82.6% | 1.9% | 158 |
| 2pm–3pm | 74.5% | 1.1% | 379 |
| 3pm–4pm | 81.6% | 0.8% | 361 |
| 4pm–5pm | 73.9% | 1.9% | 433 |
| 5pm–6pm | 74.8% | 1.6% | 547 |
| 6pm–7pm | 71.0% | 1.4% | 688 |
| 7pm–8pm | 66.7% | 1.1% | 188 |
| 8pm–9pm | 66.7% | 1.8% | 55 |
| 9pm–10pm | 55.8% | 0.0% | 87 |
Best day of the week
24 months, by day of departure.
Best month to fly
24 months, by calendar month.
Holiday travel on MDW to ATL
On-time arrivals during holiday periods compared with all other days, last 24 months.
| Period | On time | vs other days | Cancelled | Flights |
|---|---|---|---|---|
| Thanksgiving week (Tue before to Mon after) | 77.6% | -5.0 pts | 3.3% | 151 |
| Christmas & New Year (Dec 20 - Jan 3) | 78.6% | -4.0 pts | 0.7% | 296 |
| Summer peak (Jun 15 - Aug 15) | 72.7% | -9.9 pts | 2.5% | 1,304 |
| All other days | 82.6% | — | 1.3% | 5,528 |
Monthly on-time trend
On-time arrival % each month, with the 12-month US average for reference.
What causes delays on this route
Share of reported delay minutes, last 12 months (BTS cause categories).