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.
HRL → DAL
Harlingen to Dallas: 379 nonstop flights a year
On time (12 months)
84%
Cancelled
0.8%
avg delay 8 min
Best time to leave
9 AM to noon
88% on time vs 78% noon to 3 PM
Most reliable airline
Southwest
83% chance on time
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 696
11:10 AM → 12:45 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-04-01.
84%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 75% of the time (8 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 88% on time; Noon to 3 PM: 78%).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
- 58% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 8 flights
Find Southwest 696 fares Opens this date on Aviasales#2 · Southwest 2435
12:30 PM → 2:00 PM1h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
82%
chance on time
- On time (history)
- 82%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 82% of the time (55 flights, Jun 2025 to May 2026).
- Never cancelled in 55 scheduled flights.
- Leaves in this route's least on-time window (Noon to 3 PM: 78% on time; 9 AM to noon: 88%).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
Limited track record · 55 flights
Find Southwest 2435 fares Opens this date on Aviasales#3 · Southwest 3876
10:50 AM → 12:25 PM1h 35m nonstop
Local times, typical schedule. Last flown 2026-04-06.
81%
chance on time
- On time (history)
- 75%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 75% of the time (20 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (9 AM to noon: 88% on time; Noon to 3 PM: 78%).
- Lands inside DAL's trouble window: 67% of its 42 ground stops and delay programs started between 10 AM and 4 PM.
- 75% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 20 flights
Find Southwest 3876 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines83%
379 flights · 84% 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 noon88%
164 flights · avg delay 6 min
- Noon to 3 PM78%
180 flights · avg delay 11 min
Best day: Tuesday (94%). Worst: Sunday (78%).
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