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 → JAX
Chicago to Jacksonville: 382 nonstop flights a year
On time (12 months)
75%
Cancelled
0.8%
avg delay 16 min
Best time to leave
9 AM to noon
84% on time vs 63% 6 to 9 PM
Most reliable airline
Southwest
75% chance on time
Lowest nonstop fare seen in the next two months: $247 (Southwest 2946 on 2026-11-30). 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 1913
6:50 PM → 10:05 PM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1864; its record covers all of them.
66%
chance on time
- On time (history)
- 63%
- Cancelled
- 1.1%
- Avg arrival delay
- 29 min
- Arrived on time 63% of the time (87 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 63% on time; 9 AM to noon: 84%).
- 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 · 87 flights
Find Southwest 1913 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines75%
382 flights · 75% on time as flown · 0.8% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- 9 AM to noon84%
94 flights · avg delay 7 min
- Noon to 3 PM79%
139 flights · avg delay 11 min
- 3 to 6 PM70%
40 flights · avg delay 22 min
- 6 to 9 PM63%
96 flights · avg delay 27 min
Best day: Monday (86%). Worst: Friday (72%).
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