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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.

DAL → COS

Dallas to Colorado Springs: 840 nonstop flights a year

On time (12 months)

74%

Cancelled

1.0%

avg delay 16 min

Best time to leave

Before 9 AM

93% on time vs 56% after 9 PM

Most reliable airline

Southwest

73% chance on time

Check DAL to COS fares

Fares open on our travel partner (Aviasales). Pick the flight number you chose here.

Best trips

3 nonstop, 16 with 1 connection. Best overall weighs the chance you arrive on time as booked, connection odds, travel time and separate tickets.

  1. Best overall#1 · Nonstop · 2h 00m

    9:00 AM → 10:00 AM

    85%

    arrive on time

    9:00 AM DAL → 10:00 AM COS2h 00m

    Southwest 1700 · also flew as 2762, 3803

    Boeing 737-700 · 2–23 yrs old
    85% on time · 0.7% cancel
    Find Southwest 1700 fares Opens this date on Aviasales

  2. #2 · Nonstop · 2h 00m

    12:50 PM → 1:50 PM

    79%

    arrive on time

    12:50 PM DAL → 1:50 PM COS2h 00m

    Southwest 1170

    Boeing 737-800 or 737 MAX 8 · 1–14 yrs old
    79% on time · 0.9% cancel
    Find Southwest 1170 fares Opens this date on Aviasales

  3. #3 · 1 connection · 4h 45m · one ticket (Southwest)

    6:00 AM → 9:45 AM

    93%

    connections made

    82%

    arrive on time

    6:00 AM DAL → 7:05 AM DEN2h 05m

    Southwest 2121

    Boeing 737 MAX 8 or 737-800 · 2–14 yrs old
    88% on time · 1.1% cancel
    Connect in DEN · 1h 55m · 94% chance to make it · same ticket: the airline rebooks you if you miss it

    9:00 AM DEN → 9:45 AM COS45m

    Southwest 1281

    Boeing 737 MAX 8 or 737-800 · 2–22 yrs old
    88% on time · 0.5% cancel
    Find this Southwest trip Look for Southwest 2121 + Southwest 1281 on Aviasales

  4. #4 · 1 connection · 4h 20m · one ticket (Southwest)

    6:00 AM → 9:20 AM

    90%

    connections made

    80%

    arrive on time

    6:00 AM DAL → 7:05 AM DEN2h 05m

    Southwest 2121

    Boeing 737 MAX 8 or 737-800 · 2–14 yrs old
    88% on time · 1.1% cancel
    Connect in DEN · 1h 30m · 91% chance to make it · same ticket: the airline rebooks you if you miss it

    8:35 AM DEN → 9:20 AM COS45m

    Southwest 1384 · also flew as 2492

    Boeing 737-700 · 15–23 yrs old
    89% on time · 0.4% cancel
    Find this Southwest trip Look for Southwest 2121 + Southwest 1384 on Aviasales

  5. #5 · 1 connection · 4h 00m · one ticket (Southwest)

    6:45 AM → 9:45 AM

    89%

    connections made

    78%

    arrive on time

    6:45 AM DAL → 7:45 AM DEN2h 00m

    Southwest 1511

    Boeing 737 MAX 8 or 737-800 · 3–14 yrs old
    93% on time · 1.4% cancel
    Connect in DEN · 1h 15m · 91% chance to make it · same ticket: the airline rebooks you if you miss it

    9:00 AM DEN → 9:45 AM COS45m

    Southwest 1281

    Boeing 737 MAX 8 or 737-800 · 2–22 yrs old
    88% on time · 0.5% cancel
    Find this Southwest trip Look for Southwest 1511 + Southwest 1281 on Aviasales

  6. #6 · 1 connection · 5h 35m · one ticket (Southwest)

    10:55 AM → 3:30 PM

    97%

    connections made

    76%

    arrive on time

    10:55 AM DAL → 12:00 PM DEN2h 05m

    Southwest 1515 · also flew as 573

    Boeing 737-800 or 737 MAX 8 · 1–13 yrs old
    73% on time · 1.0% cancel
    Connect in DEN · 2h 45m · 98% chance to make it · same ticket: the airline rebooks you if you miss it

    2:45 PM DEN → 3:30 PM COS45m

    Southwest 2137

    Boeing 737-700 · 16–23 yrs old
    78% on time · 0.4% cancel
    Find this Southwest trip Look for Southwest 1515 + Southwest 2137 on Aviasales

  7. #7 · 1 connection · 5h 35m · one ticket (Southwest)

    9:05 AM → 1:40 PM

    96%

    connections made

    75%

    arrive on time

    9:05 AM DAL → 10:15 AM DEN2h 10m

    Southwest 2369

    Boeing 737 MAX 8 or 737-800 · 1–11 yrs old
    82% on time · 0.9% cancel
    Connect in DEN · 2h 40m · 97% chance to make it · same ticket: the airline rebooks you if you miss it

    12:55 PM DEN → 1:40 PM COS45m

    Southwest 2970

    Boeing 737-700 · 15–22 yrs old
    78% on time · 0.5% cancel
    Find this Southwest trip Look for Southwest 2369 + Southwest 2970 on Aviasales

  8. #8 · 1 connection · 6h 15m · one ticket (Southwest)

    10:15 AM → 3:30 PM

    98%

    connections made

    76%

    arrive on time

    10:15 AM DAL → 11:20 AM DEN2h 05m

    Southwest 3318

    Boeing 737-700 or 737 MAX 8 · 3–22 yrs old
    75% on time · 1.1% cancel
    Connect in DEN · 3h 25m · 99% chance to make it · same ticket: the airline rebooks you if you miss it

    2:45 PM DEN → 3:30 PM COS45m

    Southwest 2137

    Boeing 737-700 · 16–23 yrs old
    78% on time · 0.4% cancel
    Find this Southwest trip Look for Southwest 3318 + Southwest 2137 on Aviasales

  9. #9 · 1 connection · 6h 00m · one ticket (Southwest)

    8:40 AM → 1:40 PM

    97%

    connections made

    75%

    arrive on time

    8:40 AM DAL → 9:45 AM DEN2h 05m

    Southwest 2345

    Boeing 737 MAX 8 or 737-800 · 1–10 yrs old
    72% on time · 1.2% cancel
    Connect in DEN · 3h 10m · 98% chance to make it · same ticket: the airline rebooks you if you miss it

    12:55 PM DEN → 1:40 PM COS45m

    Southwest 2970

    Boeing 737-700 · 15–22 yrs old
    78% on time · 0.5% cancel
    Find this Southwest trip Look for Southwest 2345 + Southwest 2970 on Aviasales

  10. #10 · 1 connection · 6h 45m · one ticket (Southwest)

    10:55 AM → 4:40 PM

    98%

    connections made

    77%

    arrive on time

    10:55 AM DAL → 12:00 PM DEN2h 05m

    Southwest 1515 · also flew as 573

    Boeing 737-800 or 737 MAX 8 · 1–13 yrs old
    73% on time · 1.0% cancel
    Connect in DEN · 3h 55m · 100% chance to make it · same ticket: the airline rebooks you if you miss it

    3:55 PM DEN → 4:40 PM COS45m

    Southwest 3630

    Boeing 737-700 · 4–22 yrs old
    79% on time · 0.5% cancel
    Find this Southwest trip Look for Southwest 1515 + Southwest 3630 on Aviasales

Aircraft and ages come from the planes each flight number actually flew in the last 3 months of data (FAA registry build years); airlines can swap planes.

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines73%

    840 flights · 74% on time as flown · 1.0% cancel

On time by departure time

All airlines, scheduled local departure, Jun 2025 to May 2026.

  • Before 9 AM93%

    116 flights · avg delay 4 min

  • 9 AM to noon91%

    182 flights · avg delay 6 min

  • Noon to 3 PM78%

    121 flights · avg delay 15 min

  • 3 to 6 PM68%

    94 flights · avg delay 14 min

  • 6 to 9 PM59%

    200 flights · avg delay 27 min

  • After 9 PM56%

    127 flights · avg delay 25 min

Best day: Tuesday (80%). Worst: Thursday (74%).

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