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.
PIT → MDW
Pittsburgh to Chicago: 1,150 nonstop flights a year
On time (12 months)
79%
Cancelled
0.9%
avg delay 13 min
Best time to leave
9 AM to noon
97% on time vs 67% 6 to 9 PM
Most reliable airline
Southwest
79% chance on time
Lowest nonstop fare seen in the next two months: $144 (Southwest 924 on 2026-11-07). 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 1348
1:35 PM → 2:05 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 89% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 scheduled flights.
- 88% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (54 flights), so its score leans on the airline's record at this hour.
Limited track record · 54 flights
Find Southwest 1348 fares Opens this date on Aviasales#2 · Southwest 3940
8:40 AM → 9:10 AM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
84%
chance on time
- On time (history)
- 87%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 87% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Short track record (55 flights), so its score leans on the airline's record at this hour.
Limited track record · 55 flights
Find Southwest 3940 fares Opens this date on Aviasales#3 · Southwest 3299
2:25 PM → 2:55 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
82%
chance on time
- On time (history)
- 81%
- Cancelled
- 3.6%
- Avg arrival delay
- 12 min
- Arrived on time 81% of the time (27 flights, Jun 2025 to May 2026).
- Short track record (27 flights), so its score leans on the airline's record at this hour.
Limited track record · 27 flights
Find Southwest 3299 fares Opens this date on Aviasales#4 · Southwest 2209
8:30 AM → 9:00 AM1h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
80%
chance on time
- On time (history)
- 77%
- Cancelled
- 6.1%
- Avg arrival delay
- 31 min
- Arrived on time 77% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 6.1% of the time (2 of 33).
- Lands inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find Southwest 2209 fares Opens this date on Aviasales#5 · Southwest 1360
8:00 PM → 8:30 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
64%
chance on time
- On time (history)
- 62%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 62% of the time (45 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 67% on time; 9 AM to noon: 97%).
- 61% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 45 flights
Find Southwest 1360 fares Opens this date on Aviasales#6 · Southwest 3832
8:10 PM → 8:40 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-04-06.
57%
chance on time
- On time (history)
- 39%
- Cancelled
- 3.0%
- Avg arrival delay
- 37 min
- Arrived on time 39% of the time (31 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's least on-time window (6 to 9 PM: 67% on time; 9 AM to noon: 97%).
- Short track record (31 flights), so its score leans on the airline's record at this hour.
Limited track record · 31 flights
Find Southwest 3832 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines79%
1,150 flights · 79% on time as flown · 0.9% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM86%
364 flights · avg delay 11 min
- 9 AM to noon97%
103 flights · avg delay 1 min
- Noon to 3 PM84%
198 flights · avg delay 12 min
- 3 to 6 PM77%
144 flights · avg delay 15 min
- 6 to 9 PM67%
327 flights · avg delay 19 min
Best day: Saturday (84%). Worst: Sunday (77%).
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