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ATIS Alerts Smart Flight Search

Find the flight least likely to be delayed

Beta

We 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.

SNA → DEN

Santa Ana to Denver: 3,708 nonstop flights a year

On time (12 months)

82%

Cancelled

0.4%

avg delay 13 min

Best time to leave

Before 9 AM

91% on time vs 63% 3 to 6 PM

Most reliable airline

United

84% chance on time

Check SNA to DEN fares

Lowest nonstop fare seen in the next two months: $39 (Frontier 4372 on 2026-11-12). 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. #1 · United 2843

    10:20 AM → 1:43 PM2h 23m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    91%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (11 flights, Jun 2025 to May 2026).
    • Short track record (11 flights), so its score leans on the airline's record at this hour.

    Limited track record · 11 flights

    Find United 2843 fares Opens this date on Aviasales

  2. #2 · United 489

    9:00 AM → 12:24 PM2h 24m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    89%

    chance on time

    On time (history)
    91%
    Cancelled
    0.9%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (108 flights, Jun 2025 to May 2026).

    Moderate track record · 108 flights

    Find United 489 fares Opens this date on Aviasales

  3. #3 · United 513

    7:00 AM → 10:33 AM2h 33m nonstop

    Local times, typical schedule. Last flown 2026-05-30. Same departure also flew as United 250; its record covers all of them.

    89%

    chance on time

    On time (history)
    90%
    Cancelled
    0.9%
    Avg arrival delay
    5 min
    • Arrived on time 90% of the time (105 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 63%).

    Moderate track record · 105 flights

    Find United 513 fares Opens this date on Aviasales

  4. #4 · Southwest 4370

    6:45 AM → 10:05 AM2h 20m nonstop

    Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 1207, 2557; its record covers all of them.

    86%

    chance on time

    On time (history)
    90%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 90% of the time (60 flights, Jun 2025 to May 2026).
    • Never cancelled in 60 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 63%).

    Moderate track record · 60 flights

    Find Southwest 4370 fares Opens this date on Aviasales

  5. #5 · Southwest 487

    7:00 AM → 10:25 AM2h 25m nonstop

    Local times, typical schedule. Last flown 2026-05-29.

    86%

    chance on time

    On time (history)
    91%
    Cancelled
    0.0%
    Avg arrival delay
    7 min
    • Arrived on time 91% of the time (23 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 91% on time; 3 to 6 PM: 63%).
    • Short track record (23 flights), so its score leans on the airline's record at this hour.

    Limited track record · 23 flights

    Find Southwest 487 fares Opens this date on Aviasales

  6. #6 · United 2656

    6:28 PM → 9:52 PM2h 24m nonstop

    Local times, typical schedule. Last flown 2026-05-31.

    86%

    chance on time

    On time (history)
    86%
    Cancelled
    1.1%
    Avg arrival delay
    8 min
    • Arrived on time 86% of the time (273 flights, Jun 2025 to May 2026).

    Strong track record · 273 flights

    Find United 2656 fares Opens this date on Aviasales

  7. #7 · Southwest 1866

    11:55 AM → 3:15 PM2h 20m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    85%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    12 min
    • Arrived on time 93% of the time (15 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 (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 1866 fares Opens this date on Aviasales

  8. #8 · United 421

    11:10 AM → 2:34 PM2h 24m nonstop

    Local times, typical schedule. Last flown 2026-05-20.

    85%

    chance on time

    On time (history)
    88%
    Cancelled
    0.5%
    Avg arrival delay
    9 min
    • Arrived on time 88% of the time (186 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.

    Moderate track record · 186 flights

    Find United 421 fares Opens this date on Aviasales

  9. #9 · Southwest 676

    10:10 AM → 1:25 PM2h 15m nonstop

    Local times, typical schedule. Last flown 2026-04-06.

    85%

    chance on time

    On time (history)
    93%
    Cancelled
    6.7%
    Avg arrival delay
    8 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 676 fares Opens this date on Aviasales

  10. #10 · Southwest 3823

    10:45 AM → 1:55 PM2h 10m nonstop

    Local times, typical schedule. Last flown 2026-04-01.

    84%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
    • 94% of its delay minutes came from the plane arriving late from an earlier flight.
    • Short track record (8 flights), so its score leans on the airline's record at this hour.

    Limited track record · 8 flights

    Find Southwest 3823 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • United Airlines84%

    1,869 flights · 85% on time as flown · 0.4% cancel

  • Frontier Airlines83%

    303 flights · 83% on time as flown · 0.6% cancel

  • Southwest Airlines77%

    1,536 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 AM91%

    1,010 flights · avg delay 6 min

  • 9 AM to noon89%

    904 flights · avg delay 8 min

  • Noon to 3 PM76%

    866 flights · avg delay 17 min

  • 3 to 6 PM63%

    411 flights · avg delay 26 min

  • 6 to 9 PM75%

    517 flights · avg delay 14 min

Best day: Saturday (88%). Worst: Friday (80%).

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