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.
STL → DAL
St Louis to Dallas: 1,916 nonstop flights a year
On time (12 months)
77%
Cancelled
1.6%
avg delay 14 min
Best time to leave
Before 9 AM
92% on time vs 62% after 9 PM
Most reliable airline
Southwest
76% chance on time
Lowest nonstop fare seen in the next two months: $303 (Southwest 4102 on 2026-10-23). 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 2791
5:45 AM → 7:35 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 2345; its record covers all of them.
92%
chance on time
- On time (history)
- 97%
- Cancelled
- 1.5%
- Avg arrival delay
- 1 min
- Arrived on time 97% of the time (66 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 62%).
Moderate track record · 66 flights
Find Southwest 2791 fares Opens this date on Aviasales#2 · Southwest 2702
8:25 AM → 10:15 AM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 4632, 3215; its record covers all of them.
90%
chance on time
- On time (history)
- 93%
- Cancelled
- 1.1%
- Avg arrival delay
- 7 min
- Arrived on time 93% of the time (90 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; After 9 PM: 62%).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
Moderate track record · 90 flights
Find Southwest 2702 fares Opens this date on Aviasales#3 · Southwest 667
2:25 PM → 4:15 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
79%
chance on time
- On time (history)
- 93%
- Cancelled
- 6.7%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (14 flights, Jun 2025 to May 2026).
- Short track record (14 flights), so its score leans on the airline's record at this hour.
Limited track record · 14 flights
Find Southwest 667 fares Opens this date on Aviasales#4 · Southwest 3684
12:20 PM → 2:10 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
78%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 80% of the time (15 flights, Jun 2025 to May 2026).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (15 flights), so its score leans on the airline's record at this hour.
Limited track record · 15 flights
Find Southwest 3684 fares Opens this date on Aviasales#5 · Southwest 1623
7:50 PM → 9:35 PM1h 45m nonstop
Local times, typical schedule. Last flown 2026-05-30.
76%
chance on time
- On time (history)
- 77%
- Cancelled
- 0.0%
- Avg arrival delay
- 15 min
- Arrived on time 77% of the time (30 flights, Jun 2025 to May 2026).
- Never cancelled in 30 scheduled flights.
- Short track record (30 flights), so its score leans on the airline's record at this hour.
Limited track record · 30 flights
Find Southwest 1623 fares Opens this date on Aviasales#6 · Southwest 2533
11:15 AM → 1:00 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-31.
75%
chance on time
- On time (history)
- 72%
- Cancelled
- 1.9%
- Avg arrival delay
- 17 min
- Arrived on time 72% of the time (53 flights, Jun 2025 to May 2026).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (53 flights), so its score leans on the airline's record at this hour.
Limited track record · 53 flights
Find Southwest 2533 fares Opens this date on Aviasales#7 · Southwest 1473
4:10 PM → 6:00 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-30.
68%
chance on time
- On time (history)
- 68%
- Cancelled
- 6.7%
- Avg arrival delay
- 15 min
- Arrived on time 68% of the time (28 flights, Jun 2025 to May 2026).
- Cancelled 6.7% of the time (2 of 30).
- Short track record (28 flights), so its score leans on the airline's record at this hour.
Limited track record · 28 flights
Find Southwest 1473 fares Opens this date on Aviasales#8 · Southwest 3797
7:20 PM → 9:10 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-06.
67%
chance on time
- On time (history)
- 58%
- Cancelled
- 0.0%
- Avg arrival delay
- 19 min
- Arrived on time 58% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Short track record (33 flights), so its score leans on the airline's record at this hour.
Limited track record · 33 flights
Find Southwest 3797 fares Opens this date on Aviasales#9 · Southwest 61
4:35 PM → 6:25 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-05-27.
67%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 52 min
- Arrived on time 63% of the time (16 flights, Jun 2025 to May 2026).
- 69% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (16 flights), so its score leans on the airline's record at this hour.
Limited track record · 16 flights
Find Southwest 61 fares Opens this date on Aviasales#10 · Southwest 442
8:50 PM → 10:40 PM1h 50m nonstop
Local times, typical schedule. Last flown 2026-04-01.
67%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 28 min
- Arrived on time 63% of the time (8 flights, Jun 2025 to May 2026).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 442 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines76%
1,916 flights · 77% on time as flown · 1.6% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
586 flights · avg delay 5 min
- 9 AM to noon85%
236 flights · avg delay 12 min
- Noon to 3 PM76%
334 flights · avg delay 13 min
- 3 to 6 PM65%
291 flights · avg delay 22 min
- 6 to 9 PM65%
344 flights · avg delay 23 min
- After 9 PM62%
125 flights · avg delay 23 min
Best day: Tuesday (84%). Worst: Sunday (73%).
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