Route Reliability

Route reliability

Las Vegas (LAS) to Denver (DEN): which airline is most on time?

On-time arrivals, cancellations and long delays for every airline that reported nonstop flights from Las Vegas, NV (LAS) to Denver, CO (DEN), September 2025 to August 2026.

Historical performance Official DOT data through August 2026 · Not live flight status

Las Vegas, NVDenver, CO

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Three-letter airport codes, nonstop U.S. domestic flights. One direction at a time.

Route at a glance · September 2025 to August 2026

LAS to DEN

Las Vegas, NV to Denver, CO

On time
75.7%vs 75.6% U.S. average About average
Cancelled
0.8%vs 1.9% U.S. average Better than average
60+ min late
8.5%vs 8.1% U.S. average About average
Scheduled flights
7,140in 12 months3 airlines
Most reliable airline
United Airlines83.3% on time · 2,398 flights

On time about as often as the U.S. average, with fewer cancellations.

Compared with all U.S. flights, September 2025 to August 2026. “About average” means within 1.5 points for on time, 0.3 for cancelled and 1 for 60+ minutes late.

Airlines on this route

Ranked by on-time arrival

Airlines from LAS to DEN, September 2025 to August 2026. Rates are shares of all scheduled flights.
Airline On time Cancelled 60+ min late Avg delay when late Diverted Flights
1. United Airlines Most reliable 83.3% 0.5% 6.6% 74 min 0.2% 2,398
2. Frontier Airlines 75.6% 1.2% 11.0% 96 min 0.1% 1,620
3. Southwest Airlines 70.0% 0.9% 8.6% 55 min 0.4% 3,122

On time = arrived within 15 minutes of schedule. Avg delay when late = average arrival delay of flights 15+ minutes late. "Most reliable" needs at least 300 flights in 12 months. Tap a heading to sort.

What this means

United Airlines has the strongest record on this route.

  • United Airlines had the best on-time record from Las Vegas (LAS) to Denver (DEN): 83.3% of its 2,398 scheduled flights arrived within 15 minutes of schedule, compared with 70.0% for Southwest Airlines.
  • 0.8% of flights on this route were cancelled (about 1 in 125), 1.1 points lower than the U.S. average of 1.9%.
  • 8.5% of flights, about 1 in 12, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 69 min.
  • Overall, 75.7% of flights on this route arrived on time, about the same as the U.S. average of 75.6%.
  • Over the last 3 years, December was the most reliable month on this route (84.4% on time) and July the least reliable (64.7%).
  • Flights scheduled to depart 6 am to 7 am were the most punctual (90.1% on time); flights scheduled to depart 2 pm to 3 pm were the least (53.7%).
  • In the other direction, Denver (DEN) to Las Vegas (LAS), 74.9% of flights were on time and 0.6% were cancelled. Compare airlines DEN to LAS.

Best and worst months to fly LAS to DEN

Jan 81.2%
Feb 80.8%
Mar 76.4%
Apr 77.6%
May 69.9%
Jun 67.5%
Jul 64.7%
Aug 68.5%
Sep 76.6%
Oct 80.6%
Nov 82.5%
Dec 84.4%
Share of scheduled flights on time 12-month average 75.7%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 81.2% 1,871
February 80.8% 1,864
March 76.4% 2,151
April 77.6% 2,116
May 69.9% 2,114
June 67.5% 1,781
July 64.7% 1,765
August 68.5% 1,700
September 76.6% 1,951
October 80.6% 2,161
November 82.5% 1,961
December 84.4% 1,911
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
United Airlines December (89.7%) July (70.5%)
Frontier Airlines November (82.4%) June (60.4%)
Southwest Airlines December (82.7%) July (63.5%)

Month by month, last 12 months

Sep 72.7%
Oct 78.9%
Nov 78.7%
Dec 79.5%
Jan 85.4%
Feb 82.9%
Mar 76.1%
Apr 83.9%
May 74.1%
Jun 70.4%
Jul 64.5%
Aug 60.6%
Share of scheduled flights on time U.S. average 75.6%
All airlines combined, September 2025 to August 2026. Scale starts at zero.
Show as table
PeriodOn timeFlights
Sep 2025 72.7% 539
Oct 2025 78.9% 655
Nov 2025 78.7% 591
Dec 2025 79.5% 556
Jan 2026 85.4% 561
Feb 2026 82.9% 567
Mar 2026 76.1% 665
Apr 2026 83.9% 645
May 2026 74.1% 640
Jun 2026 70.4% 581
Jul 2026 64.5% 574
Aug 2026 60.6% 566

Best and worst departure times

<6a 88.6%
6a 90.1%
7a 85.4%
8a 87.1%
9a 89.0%
10a 89.6%
11a 80.4%
12p 70.4%
1p 71.5%
2p 53.7%
3p 60.5%
4p 69.6%
5p 59.9%
6p 65.7%
7p 75.7%
8p 67.2%
9p 61.2%
10p Insufficient sample
Share of scheduled flights on time
By scheduled local departure hour at LAS, September 2025 to August 2026. Hours with no scheduled flights are omitted. Scale starts at zero.
Show as table
PeriodOn timeFlights
Departing before 6 am 88.6% 852
Departing 6 am to 7 am 90.1% 536
Departing 7 am to 8 am 85.4% 301
Departing 8 am to 9 am 87.1% 342
Departing 9 am to 10 am 89.0% 672
Departing 10 am to 11 am 89.6% 183
Departing 11 am to noon 80.4% 506
Departing noon to 1 pm 70.4% 213
Departing 1 pm to 2 pm 71.5% 586
Departing 2 pm to 3 pm 53.7% 408
Departing 3 pm to 4 pm 60.5% 453
Departing 4 pm to 5 pm 69.6% 608
Departing 5 pm to 6 pm 59.9% 252
Departing 6 pm to 7 pm 65.7% 484
Departing 7 pm to 8 pm 75.7% 177
Departing 8 pm to 9 pm 67.2% 274
Departing 9 pm to 10 pm 61.2% 258
Departing 10 pm to 11 pm Insufficient sample 35
Woman at an airport window watching a plane take off
Photo: Depositphotos (licensed stock, illustrative only). Credits

Sources & data dates

Source
U.S. DOT Bureau of Transportation Statistics, Reporting Carrier On-Time Performance (1987-present)
Period
September 2025 to August 2026 (12 months); month-of-year patterns September 2023 to August 2026
Data through
August 2026
Processed
2026-11-03
Scope
Nonstop scheduled flights from Las Vegas, NV (LAS) to Denver, CO (DEN), one direction. Airlines that report to the DOT only.
Method
Rates use all scheduled flights as the denominator; cancelled and diverted flights count as not on time. Figures based on fewer than 50 scheduled flights are suppressed. Full methodology.

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