ATIS Alerts Smart Flight Search
Find the flight least likely to be delayed
BetaWe rank real flight numbers by how often they flew and arrived on time over the last 12 months, adjusted for your travel month and departure time, then check nearby airports and calmer connections. US airlines and airports.
MDW → PIT
Chicago to Pittsburgh: 1,148 nonstop flights a year
On time (12 months)
80%
Cancelled
1.1%
avg delay 13 min
Best time to leave
Before 9 AM
92% on time vs 63% after 9 PM
Most reliable airline
Southwest
79% chance on time
Lowest nonstop fare seen in the next two months: $148 (Southwest 1764 on 2026-10-18). 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 · Southwest 3942
7:45 AM → 10:05 AM1h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3108, 1550, 2661; its record covers all of them.
89%
chance on time
- On time (history)
- 93%
- Cancelled
- 2.3%
- Avg arrival delay
- 7 min
- Arrived on time 93% of the time (84 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 63%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Moderate track record · 84 flights
Find Southwest 3942 fares Opens this date on Aviasales#2 · Southwest 1125
12:50 PM → 3:15 PM1h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 994; its record covers all of them.
77%
chance on time
- On time (history)
- 79%
- Cancelled
- 1.4%
- Avg arrival delay
- 17 min
- Arrived on time 79% of the time (73 flights, Jun 2025 to May 2026).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Moderate track record · 73 flights
Find Southwest 1125 fares Opens this date on Aviasales#3 · Southwest 1181
6:55 PM → 9:20 PM1h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1905; its record covers all of them.
73%
chance on time
- On time (history)
- 73%
- Cancelled
- 2.3%
- Avg arrival delay
- 15 min
- Arrived on time 73% of the time (86 flights, Jun 2025 to May 2026).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Moderate track record · 86 flights
Find Southwest 1181 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines79%
1,148 flights · 80% on time as flown · 1.1% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
130 flights · avg delay 6 min
- 9 AM to noon90%
234 flights · avg delay 6 min
- Noon to 3 PM81%
319 flights · avg delay 14 min
- 3 to 6 PM72%
115 flights · avg delay 14 min
- 6 to 9 PM74%
221 flights · avg delay 16 min
- After 9 PM63%
129 flights · avg delay 24 min
Best day: Wednesday (84%). Worst: Sunday (76%).
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