Route on-time record
COS to LAS: most on-time flights and the best time to fly
Colorado Springs (City of Colorado Springs Municipal Airport) to Las Vegas (Harry Reid International Airport). 860 nonstop flights in Jun 2025 to May 2026, 80% arrived within 15 minutes and 0.0% were cancelled. The most reliable flight number was Southwest 247 at 5:30 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
COS → LAS
Colorado Springs to Las Vegas: 860 nonstop flights a year
On time (12 months)
80%
Cancelled
0.0%
avg delay 12 min
Best time to leave
Before 9 AM
97% on time vs 66% 6 to 9 PM
Most reliable airline
Southwest
80% chance on time
Lowest nonstop fare seen in the next two months: $123 (Southwest 21 on 2026-11-11). 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 247
5:30 AM → 6:30 AM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as Southwest 3047; its record covers all of them.
94%
chance on time
- On time (history)
- 98%
- Cancelled
- 0.0%
- Avg arrival delay
- 1 min
- Arrived on time 98% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 97% on time; 6 to 9 PM: 66%).
Moderate track record · 64 flights
Find Southwest 247 fares Opens this date on Aviasales#2 · Southwest 3783
7:45 AM → 8:45 AM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-30.
88%
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).
- Leaves in this route's most on-time window (Before 9 AM: 97% on time; 6 to 9 PM: 66%).
- Short track record (8 flights), so its score leans on the airline's record at this hour.
Limited track record · 8 flights
Find Southwest 3783 fares Opens this date on Aviasales#3 · Southwest 2970
2:15 PM → 3:15 PM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-30.
79%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.0%
- Avg arrival delay
- 5 min
- Arrived on time 88% of the time (8 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 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 2970 fares Opens this date on Aviasales#4 · Southwest 3498
8:00 PM → 9:05 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
78%
chance on time
- On time (history)
- 85%
- Cancelled
- 0.0%
- Avg arrival delay
- 9 min
- Arrived on time 85% of the time (46 flights, Jun 2025 to May 2026).
- Never cancelled in 46 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 97%).
- Short track record (46 flights), so its score leans on the airline's record at this hour.
Limited track record · 46 flights
Find Southwest 3498 fares Opens this date on Aviasales#5 · Southwest 1998
12:00 PM → 1:05 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-04-06.
76%
chance on time
- On time (history)
- 80%
- Cancelled
- 0.0%
- Avg arrival delay
- 13 min
- Arrived on time 80% of the time (15 flights, Jun 2025 to May 2026).
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 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 1998 fares Opens this date on Aviasales#6 · Southwest 2805
8:35 PM → 9:40 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-05-31.
73%
chance on time
- On time (history)
- 86%
- Cancelled
- 0.0%
- Avg arrival delay
- 12 min
- Arrived on time 86% of the time (7 flights, Jun 2025 to May 2026).
- Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 97%).
- 98% of its delay minutes came from the plane arriving late from an earlier flight.
- Short track record (7 flights), so its score leans on the airline's record at this hour.
Limited track record · 7 flights
Find Southwest 2805 fares Opens this date on Aviasales#7 · Southwest 2835
8:45 PM → 9:50 PM2h 05m nonstop
Local times, typical schedule. Last flown 2026-04-06.
72%
chance on time
- On time (history)
- 76%
- Cancelled
- 0.0%
- Avg arrival delay
- 10 min
- Arrived on time 76% of the time (33 flights, Jun 2025 to May 2026).
- Never cancelled in 33 scheduled flights.
- Leaves in this route's least on-time window (6 to 9 PM: 66% on time; Before 9 AM: 97%).
- 62% of its delay minutes came from the plane arriving late from an earlier flight.
Limited track record · 33 flights
Find Southwest 2835 fares Opens this date on Aviasales#8 · Southwest 1444
12:10 PM → 1:10 PM2h 00m nonstop
Local times, typical schedule. Last flown 2026-05-29.
71%
chance on time
- On time (history)
- 69%
- Cancelled
- 0.0%
- Avg arrival delay
- 17 min
- Arrived on time 69% of the time (39 flights, Jun 2025 to May 2026).
- Never cancelled in 39 scheduled flights.
- Lands inside LAS's trouble window: 51% of its 104 ground stops and delay programs started between 10 AM and 4 PM.
- Short track record (39 flights), so its score leans on the airline's record at this hour.
Limited track record · 39 flights
Find Southwest 1444 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- Southwest Airlines80%
860 flights · 80% on time as flown · 0.0% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM97%
324 flights · avg delay 4 min
- 9 AM to noon75%
81 flights · avg delay 14 min
- Noon to 3 PM72%
146 flights · avg delay 15 min
- 3 to 6 PM70%
86 flights · avg delay 20 min
- 6 to 9 PM66%
223 flights · avg delay 19 min
Best day: Saturday (85%). Worst: Friday (74%).
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.
What delays this route
- Late-arriving aircraft49%
- Airline (crew, maintenance, boarding)28%
- Air traffic control and airport volume18%
- Severe weather5%
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 LAS questions
- What time of day is best to fly COS to LAS?
- Before 9 AM: 97% of flights arrived on time, against 66% 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 LAS?
- Southwest, with a season-adjusted 80% chance of operating and arriving on time over 860 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 LAS?
- July (75% on time); the best was September (83%), 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
- LAS to COS (return)
- COS to DEN 77%
- COS to DFW 78%
- COS to ORD 75%
- COS to PHX 82%
- COS to DAL 82%
- COS to SLC 93%
- COS to ATL 89%
Live status: FAA delays and ground stops