Route on-time record

ATL to MDW: most on-time flights and the best time to fly

Atlanta (Hartsfield Jackson Atlanta International Airport) to Chicago (Chicago Midway International Airport). 3,535 nonstop flights in Jun 2025 to May 2026, 76% arrived within 15 minutes and 1.9% were cancelled. The most reliable flight number was Delta 2417 at 11:05 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

ATL → MDW

Atlanta to Chicago: 3,535 nonstop flights a year

On time (12 months)

76%

Cancelled

1.9%

avg delay 17 min

Best time to leave

Before 9 AM

87% on time vs 63% after 9 PM

Most reliable airline

Delta

78% chance on time

Check ATL to MDW fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Most reliable nonstop flights

Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.

#1 · Delta 2417
11:05 AM → 12:02 PM1h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
On time (history)
87%
Cancelled
3.3%
Avg arrival delay
6 min
- Arrived on time 87% of the time (257 flights, Jun 2025 to May 2026).
- Cancelled 3.3% of the time (9 of 269).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Strong track record · 257 flights
Find Delta 2417 fares Opens this date on Aviasales
#2 · Delta 1063
8:59 AM → 9:56 AM1h 57m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
86%
Cancelled
3.0%
Avg arrival delay
7 min
- Arrived on time 86% of the time (352 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (11 of 365).
- Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 63%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 352 flights
Find Delta 1063 fares Opens this date on Aviasales
#3 · Delta 1728
3:15 PM → 4:12 PM1h 56m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
On time (history)
84%
Cancelled
0.0%
Avg arrival delay
8 min
- Arrived on time 84% of the time (49 flights, Jun 2025 to May 2026).
- Never cancelled in 49 scheduled flights.
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- Short track record (49 flights), so its score leans on the airline's record at this hour.
Limited track record · 49 flights
Find Delta 1728 fares Opens this date on Aviasales
#4 · Southwest 2672
11:20 AM → 12:20 PM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2872; its record covers all of them.
80%
chance on time
On time (history)
78%
Cancelled
2.7%
Avg arrival delay
10 min
- Arrived on time 78% of the time (72 flights, Jun 2025 to May 2026).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Moderate track record · 72 flights
Find Southwest 2672 fares Opens this date on Aviasales
#5 · Southwest 1191
7:55 AM → 8:50 AM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 322; its record covers all of them.
77%
chance on time
On time (history)
75%
Cancelled
1.1%
Avg arrival delay
20 min
- Arrived on time 75% of the time (87 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 87% on time; After 9 PM: 63%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Moderate track record · 87 flights
Find Southwest 1191 fares Opens this date on Aviasales
#6 · Delta 2060
4:27 PM → 5:22 PM1h 55m nonstop
Local times, typical schedule. Last flown 2026-04-12.
77%
chance on time
On time (history)
79%
Cancelled
1.2%
Avg arrival delay
12 min
- Arrived on time 79% of the time (248 flights, Jun 2025 to May 2026).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
Strong track record · 248 flights
Find Delta 2060 fares Opens this date on Aviasales
#7 · Delta 1076
9:35 PM → 10:31 PM1h 56m nonstop
Local times, typical schedule. Last flown 2026-05-31.
72%
chance on time
On time (history)
75%
Cancelled
3.0%
Avg arrival delay
21 min
- Arrived on time 75% of the time (353 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (11 of 365).
- Leaves in this route's least on-time window (After 9 PM: 63% on time; Before 9 AM: 87%).
- Departs outside ATL's trouble window (1 PM to 7 PM, when 59% of its 96 ground stops and delay programs started).
Strong track record · 353 flights
Find Delta 1076 fares Opens this date on Aviasales
#8 · Southwest 2705
4:05 PM → 5:05 PM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3034; its record covers all of them.
71%
chance on time
On time (history)
67%
Cancelled
2.4%
Avg arrival delay
16 min
- Arrived on time 67% of the time (39 flights, Jun 2025 to May 2026).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- 54% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 2705 fares Opens this date on Aviasales
#9 · Frontier 2291
6:26 PM → 7:31 PM2h 04m nonstop
Local times, typical schedule. Last flown 2026-05-31.
69%
chance on time
On time (history)
72%
Cancelled
0.8%
Avg arrival delay
25 min
- Arrived on time 72% of the time (259 flights, Jun 2025 to May 2026).
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- 52% of its delay minutes came from the plane arriving late from an earlier flight.
Strong track record · 259 flights
Find Frontier 2291 fares Opens this date on Aviasales
#10 · Southwest 258
5:20 PM → 6:15 PM1h 55m nonstop
Local times, typical schedule. Last flown 2026-05-30.
67%
chance on time
On time (history)
60%
Cancelled
0.0%
Avg arrival delay
22 min
- Arrived on time 60% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Departs inside ATL's trouble window: 59% of its 96 ground stops and delay programs started between 1 PM and 7 PM.
- 55% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 47 flights
Find Southwest 258 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

Delta Air Lines78%
1,406 flights · 80% on time as flown · 2.6% cancel
Southwest Airlines76%
1,550 flights · 77% on time as flown · 1.4% cancel
Frontier Airlines64%
579 flights · 64% on time as flown · 1.3% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

Before 9 AM87%
728 flights · avg delay 8 min
9 AM to noon84%
621 flights · avg delay 8 min
Noon to 3 PM77%
399 flights · avg delay 15 min
3 to 6 PM76%
717 flights · avg delay 13 min
6 to 9 PM65%
513 flights · avg delay 26 min
After 9 PM63%
557 flights · avg delay 36 min

Best day: Wednesday (83%). Worst: Sunday (74%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

What delays this route

Late-arriving aircraft45%
Airline (crew, maintenance, boarding)36%
Air traffic control and airport volume14%
Severe weather5%

Share of delay minutes by the cause airlines report to the US DOT.

Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure

ATL to MDW questions

What time of day is best to fly ATL to MDW?: Before 9 AM: 87% of flights arrived on time, against 63% for departures after 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from ATL to MDW?: Delta, with a season-adjusted 78% chance of operating and arriving on time over 1,406 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on ATL to MDW?: July (66% on time); the best was September (85%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?: No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

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