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.
SJC → DEN
San Jose to Denver: 2,594 nonstop flights a year
On time (12 months)
81%
Cancelled
0.4%
avg delay 12 min
Best time to leave
Before 9 AM
94% on time vs 72% 3 to 6 PM
Most reliable airline
United
87% 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 · United 586
8:45 AM → 12:23 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1134, 272; its record covers all of them.
97%
chance on time
- On time (history)
- 99%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 99% of the time (88 flights, Jun 2025 to May 2026).
- Never cancelled in 88 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 72%).
Moderate track record · 88 flights
Find United 586 fares Opens this date on Aviasales#2 · Southwest 104
6:00 AM → 9:35 AM2h 35m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 2023; its record covers all of them.
94%
chance on time
- On time (history)
- 98%
- Cancelled
- 1.6%
- Avg arrival delay
- 10 min
- Arrived on time 98% of the time (63 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 72%).
Moderate track record · 63 flights
Find Southwest 104 fares Opens this date on Aviasales#3 · United 1035
6:19 PM → 9:58 PM2h 39m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 88% of the time (25 flights, Jun 2025 to May 2026).
- Short track record (25 flights), so its score leans on the airline's record at this hour.
Limited track record · 25 flights
Find United 1035 fares Opens this date on Aviasales#4 · Southwest 2933
6:35 AM → 10:05 AM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-31.
89%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 88% of the time (32 flights, Jun 2025 to May 2026).
- Never cancelled in 32 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 72%).
- Short track record (32 flights), so its score leans on the airline's record at this hour.
Limited track record · 32 flights
Find Southwest 2933 fares Opens this date on Aviasales#5 · Southwest 4112
8:55 AM → 12:25 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as Southwest 3658; its record covers all of them.
86%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 8 min
- Arrived on time 85% of the time (41 flights, Jun 2025 to May 2026).
- Never cancelled in 41 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 94% on time; 3 to 6 PM: 72%).
- Short track record (41 flights), so its score leans on the airline's record at this hour.
Limited track record · 41 flights
Find Southwest 4112 fares Opens this date on Aviasales#6 · United 667
3:45 PM → 7:24 PM2h 39m nonstop
Local times, typical schedule. Last flown 2026-05-20.
85%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.9%
- Avg arrival delay
- 10 min
- Arrived on time 89% of the time (113 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (3 to 6 PM: 72% on time; Before 9 AM: 94%).
- 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 · 113 flights
Find United 667 fares Opens this date on Aviasales#7 · Southwest 1065
10:50 AM → 2:20 PM2h 30m nonstop
Local times, typical schedule. Last flown 2026-05-29. Same departure also flew as Southwest 872; its record covers all of them.
77%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 11 min
- Arrived on time 76% of the time (38 flights, Jun 2025 to May 2026).
- Never cancelled in 38 scheduled flights.
- 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 (38 flights), so its score leans on the airline's record at this hour.
Limited track record · 38 flights
Find Southwest 1065 fares Opens this date on Aviasales#8 · United 663
2:32 PM → 6:10 PM2h 38m nonstop
Local times, typical schedule. Last flown 2026-05-31.
76%
chance on time
- On time (history)
- 70%
- Cancelled
- 0.0%
- Avg arrival delay
- 23 min
- Arrived on time 70% of the time (10 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.
- 83% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (10 flights), so its score leans on the airline's record at this hour.
Limited track record · 10 flights
Find United 663 fares Opens this date on Aviasales#9 · Southwest 856
1:45 PM → 5:10 PM2h 25m nonstop
Local times, typical schedule. Last flown 2026-04-01.
74%
chance on time
- On time (history)
- 100%
- Cancelled
- 0.0%
- Avg arrival delay
- 0 min
- Arrived on time 100% of the time (8 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 (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 856 fares Opens this date on Aviasales#10 · Southwest 1681
7:40 PM → 11:05 PM2h 25m nonstop
Local times, typical schedule. Last flown 2026-05-31.
65%
chance on time
- On time (history)
- 63%
- Cancelled
- 0.0%
- Avg arrival delay
- 18 min
- Arrived on time 63% of the time (46 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- 81% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (46 flights), so its score leans on the airline's record at this hour.
Limited track record · 46 flights
Find Southwest 1681 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines87%
1,006 flights · 88% on time as flown · 0.4% cancel
- Frontier Airlines81%
63 flights · 78% on time as flown · 0.3% cancel
- Southwest Airlines77%
1,524 flights · 77% on time as flown · 0.5% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM94%
914 flights · avg delay 4 min
- 9 AM to noon83%
167 flights · avg delay 9 min
- Noon to 3 PM73%
734 flights · avg delay 17 min
- 3 to 6 PM72%
470 flights · avg delay 18 min
- 6 to 9 PM78%
308 flights · avg delay 13 min
Best day: Saturday (88%). Worst: Friday (81%).
Smarter routing
Nearby airports that run more on time
MRY → DEN 93% chance on time
Monterey Regional Airport to Denver International Airport · 729 flights a year · 54 mi from your airports · yours: 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