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Route on-time record

COS to PHX: most on-time flights and the best time to fly

Colorado Springs (City of Colorado Springs Municipal Airport) to Phoenix (Phoenix Sky Harbor International Airport). 993 nonstop flights in Jun 2025 to May 2026, 82% arrived within 15 minutes and 0.2% were cancelled. The most reliable flight number was Southwest 1741 at 6:15 AM.

Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.

COS → PHX

Colorado Springs to Phoenix: 993 nonstop flights a year

On time (12 months)

82%

Cancelled

0.2%

avg delay 12 min

Best time to leave

Before 9 AM

94% on time vs 71% 6 to 9 PM

Most reliable airline

Southwest

82% chance on time

Check COS to PHX fares

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 · Southwest 1741

    6:15 AM → 7:10 AM1h 55m nonstop

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

    95%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (31 flights, Jun 2025 to May 2026).
    • Never cancelled in 31 scheduled flights.
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 71%).
    • Short track record (31 flights), so its score leans on the airline's record at this hour.

    Limited track record · 31 flights

    Find Southwest 1741 fares Opens this date on Aviasales

  2. #2 · Southwest 2045

    5:55 AM → 6:55 AM2h 00m nonstop

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

    93%

    chance on time

    On time (history)
    100%
    Cancelled
    0.0%
    Avg arrival delay
    0 min
    • Arrived on time 100% of the time (28 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 71%).
    • Short track record (28 flights), so its score leans on the airline's record at this hour.

    Limited track record · 28 flights

    Find Southwest 2045 fares Opens this date on Aviasales

  3. #3 · Southwest 1129

    6:25 AM → 7:25 AM2h 00m nonstop

    Local times, typical schedule. Last flown 2026-04-05.

    91%

    chance on time

    On time (history)
    94%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 94% of the time (18 flights, Jun 2025 to May 2026).
    • Leaves in this route's most on-time window (Before 9 AM: 94% on time; 6 to 9 PM: 71%).
    • Short track record (18 flights), so its score leans on the airline's record at this hour.

    Limited track record · 18 flights

    Find Southwest 1129 fares Opens this date on Aviasales

  4. #4 · Southwest 3630

    5:15 PM → 6:20 PM2h 05m nonstop

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

    86%

    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 PHX's trouble window: 43% of its 46 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 3630 fares Opens this date on Aviasales

  5. #5 · Southwest 2946

    11:10 AM → 12:10 PM2h 00m nonstop

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

    85%

    chance on time

    On time (history)
    93%
    Cancelled
    0.0%
    Avg arrival delay
    4 min
    • Arrived on time 93% of the time (15 flights, Jun 2025 to May 2026).
    • Short track record (15 flights), so its score leans on the airline's record at this hour.

    Limited track record · 15 flights

    Find Southwest 2946 fares Opens this date on Aviasales

  6. #6 · Southwest 2758

    8:55 PM → 9:55 PM2h 00m nonstop

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

    84%

    chance on time

    On time (history)
    92%
    Cancelled
    0.0%
    Avg arrival delay
    6 min
    • Arrived on time 92% of the time (25 flights, Jun 2025 to May 2026).
    • Leaves in this route's least on-time window (6 to 9 PM: 71% on time; Before 9 AM: 94%).
    • Short track record (25 flights), so its score leans on the airline's record at this hour.

    Limited track record · 25 flights

    Find Southwest 2758 fares Opens this date on Aviasales

  7. #7 · Southwest 3757

    9:10 AM → 10:05 AM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-27.

    84%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    5 min
    • Arrived on time 88% of the time (16 flights, Jun 2025 to May 2026).
    • Short track record (16 flights), so its score leans on the airline's record at this hour.

    Limited track record · 16 flights

    Find Southwest 3757 fares Opens this date on Aviasales

  8. #8 · Southwest 962

    11:30 AM → 12:25 PM1h 55m nonstop

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

    82%

    chance on time

    On time (history)
    80%
    Cancelled
    0.0%
    Avg arrival delay
    8 min
    • Arrived on time 80% of the time (30 flights, Jun 2025 to May 2026).
    • Never cancelled in 30 scheduled flights.
    • Short track record (30 flights), so its score leans on the airline's record at this hour.

    Limited track record · 30 flights

    Find Southwest 962 fares Opens this date on Aviasales

  9. #9 · Southwest 4009

    1:10 PM → 2:05 PM1h 55m nonstop

    Local times, typical schedule. Last flown 2026-05-30.

    81%

    chance on time

    On time (history)
    88%
    Cancelled
    0.0%
    Avg arrival delay
    10 min
    • Arrived on time 88% of the time (24 flights, Jun 2025 to May 2026).
    • Lands inside PHX's trouble window: 43% of its 46 ground stops and delay programs started between 2 PM and 8 PM.
    • Short track record (24 flights), so its score leans on the airline's record at this hour.

    Limited track record · 24 flights

    Find Southwest 4009 fares Opens this date on Aviasales

  10. #10 · Southwest 1448

    7:20 PM → 8:15 PM1h 55m nonstop

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

    74%

    chance on time

    On time (history)
    74%
    Cancelled
    0.0%
    Avg arrival delay
    15 min
    • Arrived on time 74% of the time (47 flights, Jun 2025 to May 2026).
    • Never cancelled in 47 scheduled flights.
    • Leaves in this route's least on-time window (6 to 9 PM: 71% on time; Before 9 AM: 94%).
    • 84% of its delay minutes came from the plane arriving late from an earlier flight.

    Limited track record · 47 flights

    Find Southwest 1448 fares Opens this date on Aviasales

Airlines on this route

Season-adjusted chance of operating and arriving on time.

  • Southwest Airlines82%

    993 flights · 82% on time as flown · 0.2% cancel

On time by departure time

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

  • Before 9 AM94%

    334 flights · avg delay 5 min

  • 9 AM to noon87%

    126 flights · avg delay 6 min

  • Noon to 3 PM80%

    142 flights · avg delay 16 min

  • 3 to 6 PM72%

    192 flights · avg delay 15 min

  • 6 to 9 PM71%

    190 flights · avg delay 19 min

Best day: Saturday (86%). Worst: Monday (80%).

On time by month

All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.

J
86
F
86
M
89
A
88
M
80
J
76
J
76
A
80
S
86
O
83
N
83
D
82

What delays this route

  • Late-arriving aircraft58%
  • Airline (crew, maintenance, boarding)21%
  • Air traffic control and airport volume17%
  • Severe weather3%

Share of delay minutes by the cause airlines report to the US DOT.

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

COS to PHX questions

What time of day is best to fly COS to PHX?
Before 9 AM: 94% of flights arrived on time, against 71% for departures 6 to 9 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
Which airline is most on time from COS to PHX?
Southwest, with a season-adjusted 82% chance of operating and arriving on time over 993 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
What is the worst month for delays on COS to PHX?
June (76% on time); the best was March (89%), averaged over Jun 2023 to May 2026.
Is this a prediction for my flight?
No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.

More routes from COS

Live status: FAA delays and ground stops