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.
LGB → DEN
Long Beach to Denver: 1,014 nonstop flights a year
On time (12 months)
81%
Cancelled
0.3%
avg delay 13 min
Best time to leave
Before 9 AM
92% on time vs 56% 3 to 6 PM
Most reliable airline
Southwest
81% 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 2948
9:00 AM → 12:15 PM2h 15m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 2105; its record covers all of them.
90%
chance on time
- On time (history)
- 93%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 93% of the time (80 flights, Jun 2025 to May 2026).
- Never cancelled in 80 scheduled flights.
Moderate track record · 80 flights
Find Southwest 2948 fares Opens this date on Aviasales#2 · Southwest 3255
6:50 AM → 10:10 AM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2040, 2902; its record covers all of them.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 92% of the time (87 flights, Jun 2025 to May 2026).
- Never cancelled in 87 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 92% on time; 3 to 6 PM: 56%).
Moderate track record · 87 flights
Find Southwest 3255 fares Opens this date on Aviasales#3 · Southwest 4292
1:50 PM → 5:10 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31.
77%
chance on time
- On time (history)
- 74%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 74% of the time (23 flights, Jun 2025 to May 2026).
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
- Short track record (23 flights), so its score leans on the airline's record at this hour.
Limited track record · 23 flights
Find Southwest 4292 fares Opens this date on Aviasales#4 · Southwest 3833
2:55 PM → 6:15 PM2h 20m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2013; its record covers all of them.
68%
chance on time
- On time (history)
- 64%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 64% of the time (72 flights, Jun 2025 to May 2026).
- Never cancelled in 72 scheduled flights.
- Lands inside DEN's trouble window: 79% of its 174 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 72 flights
Find Southwest 3833 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines81%
1,014 flights · 81% on time as flown · 0.3% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM92%
364 flights · avg delay 6 min
- 9 AM to noon89%
247 flights · avg delay 7 min
- Noon to 3 PM75%
221 flights · avg delay 13 min
- 3 to 6 PM56%
172 flights · avg delay 36 min
Best day: Wednesday (86%). Worst: Friday (81%).
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