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 → AUS
Chicago to Austin: 1,351 nonstop flights a year
On time (12 months)
77%
Cancelled
0.7%
avg delay 13 min
Best time to leave
Before 9 AM
88% on time vs 53% after 9 PM
Most reliable airline
Southwest
76% chance on time
Lowest nonstop fare seen in the next two months: $164 (Southwest 2892 on 2026-11-13). 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 3225
10:25 AM → 1:10 PM2h 45m nonstop
Local times, typical schedule. Last flown 2026-05-31.
85%
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.
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
- Lands inside AUS's trouble window: 79% of its 91 ground stops and delay programs started between 10 AM and 4 PM.
Limited track record · 55 flights
Find Southwest 3225 fares Opens this date on Aviasales#2 · Southwest 709
10:00 AM → 12:50 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
85%
chance on time
- On time (history)
- 92%
- Cancelled
- 4.0%
- Avg arrival delay
- 12 min
- Arrived on time 92% of the time (24 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.
- Lands inside AUS's trouble window: 79% of its 91 ground stops and delay programs started between 10 AM and 4 PM.
- 63% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 24 flights
Find Southwest 709 fares Opens this date on Aviasales#3 · Southwest 3905
6:00 AM → 8:55 AM2h 55m nonstop
Local times, typical schedule. Last flown 2026-04-06. Same departure also flew as Southwest 456; its record covers all of them.
84%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 89% of the time (36 flights, Jun 2025 to May 2026).
- Never cancelled in 36 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; After 9 PM: 53%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 36 flights
Find Southwest 3905 fares Opens this date on Aviasales#4 · Southwest 667
7:30 AM → 10:10 AM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-29.
80%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 85% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 88% on time; After 9 PM: 53%).
- Departs inside MDW's trouble window: 50% of its 30 ground stops and delay programs started between 7 AM and 1 PM.
Limited track record · 39 flights
Find Southwest 667 fares Opens this date on Aviasales#5 · Southwest 3227
4:50 PM → 7:30 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-30.
78%
chance on time
- On time (history)
- 83%
- Cancelled
- 0.0%
- Avg arrival delay
- 14 min
- Arrived on time 83% of the time (30 flights, Jun 2025 to May 2026).
- Never cancelled in 31 scheduled flights.
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- 50% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 30 flights
Find Southwest 3227 fares Opens this date on Aviasales#6 · Southwest 2776
2:30 PM → 5:10 PM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-30.
77%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 74% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
- Short track record (47 flights), so its score leans on the airline's record at this hour.
Limited track record · 47 flights
Find Southwest 2776 fares Opens this date on Aviasales#7 · Southwest 370
6:10 PM → 9:00 PM2h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
66%
chance on time
- On time (history)
- 67%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 67% of the time (15 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).
- 54% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 370 fares Opens this date on Aviasales#8 · Southwest 2082
9:40 PM → 12:30 AM2h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
58%
chance on time
- On time (history)
- 50%
- Cancelled
- 3.0%
- Avg arrival delay
- 35 min
- Arrived on time 50% of the time (32 flights, Jun 2025 to May 2026).
- Cancelled 3.0% of the time (1 of 33).
- Leaves in this route's least on-time window (After 9 PM: 53% on time; Before 9 AM: 88%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 32 flights
Find Southwest 2082 fares Opens this date on Aviasales#9 · Southwest 3228
9:30 PM → 12:10 AM2h 40m nonstop
Local times, typical schedule. Last flown 2026-05-31.
55%
chance on time
- On time (history)
- 47%
- Cancelled
- 0.0%
- Avg arrival delay
- 29 min
- Arrived on time 47% of the time (47 flights, Jun 2025 to May 2026).
- Never cancelled in 47 scheduled flights.
- Leaves in this route's least on-time window (After 9 PM: 53% on time; Before 9 AM: 88%).
- Departs outside MDW's trouble window (7 AM to 1 PM, when 50% of its 30 ground stops and delay programs started).
Limited track record · 47 flights
Find Southwest 3228 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines76%
1,351 flights · 77% on time as flown · 0.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM88%
388 flights · avg delay 6 min
- 9 AM to noon85%
179 flights · avg delay 9 min
- Noon to 3 PM79%
235 flights · avg delay 13 min
- 3 to 6 PM70%
147 flights · avg delay 15 min
- 6 to 9 PM70%
244 flights · avg delay 16 min
- After 9 PM53%
158 flights · avg delay 26 min
Best day: Tuesday (84%). Worst: Sunday (74%).
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