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.
PDX → MDW
Portland to Chicago: 686 nonstop flights a year
On time (12 months)
89%
Cancelled
0.7%
avg delay 6 min
Best time to leave
After 9 PM
94% on time vs 68% noon to 3 PM
Most reliable airline
Southwest
88% chance on time
Lowest nonstop fare seen in the next two months: $255 (Southwest 2737 on 2026-10-24). 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 1162
5:10 AM → 11:05 AM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31.
93%
chance on time
- On time (history)
- 96%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 96% of the time (54 flights, Jun 2025 to May 2026).
- Never cancelled in 54 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 (54 flights), so its score leans on the airline's record at this hour.
Limited track record · 54 flights
Find Southwest 1162 fares Opens this date on Aviasales#2 · Southwest 3708
11:55 PM → 5:50 AM3h 55m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 4161; its record covers all of them.
91%
chance on time
- On time (history)
- 94%
- Cancelled
- 2.3%
- Avg arrival delay
- 3 min
- Arrived on time 94% of the time (84 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (After 9 PM: 94% on time; Noon to 3 PM: 68%).
Moderate track record · 84 flights
Find Southwest 3708 fares Opens this date on Aviasales#3 · Southwest 280
5:20 AM → 11:15 AM3h 55m nonstop
Local times, typical schedule. Last flown 2026-04-06.
90%
chance on time
- On time (history)
- 94%
- Cancelled
- 6.1%
- Avg arrival delay
- 4 min
- Arrived on time 94% 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 280 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines88%
686 flights · 89% on time as flown · 0.7% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
426 flights · avg delay 4 min
- 9 AM to noon90%
40 flights · avg delay 7 min
- Noon to 3 PM68%
131 flights · avg delay 13 min
- After 9 PM94%
89 flights · avg delay 3 min
Best day: Saturday (92%). Worst: Sunday (84%).
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