Route Reliability

Route reliability

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

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

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

Denver, COLas Vegas, NV

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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

DEN to LAS

Denver, CO to Las Vegas, NV

On time
74.9%vs 75.6% U.S. average About average
Cancelled
0.6%vs 1.9% U.S. average Better than average
60+ min late
8.4%vs 8.1% U.S. average About average
Scheduled flights
7,168in 12 months3 airlines
Most reliable airline
United Airlines78.9% on time · 2,401 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 DEN to LAS, 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 78.9% 0.3% 7.3% 65 min 0.2% 2,401
2. Frontier Airlines 75.0% 1.0% 9.5% 78 min 0.0% 1,626
3. Southwest Airlines 71.8% 0.7% 8.7% 58 min 0.1% 3,141

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 Denver (DEN) to Las Vegas (LAS): 78.9% of its 2,401 scheduled flights arrived within 15 minutes of schedule, compared with 71.8% for Southwest Airlines.
  • 0.6% of flights on this route were cancelled (about 1 in 167), 1.3 points lower than the U.S. average of 1.9%.
  • 8.4% of flights, about 1 in 12, arrived an hour or more late. When a flight was late (15+ minutes), the average arrival delay was 64 min.
  • Overall, 74.9% of flights on this route arrived on time, 0.7 points lower than the U.S. average of 75.6%.
  • Over the last 3 years, November was the most reliable month on this route (81.7% on time) and July the least reliable (64.5%).
  • Flights scheduled to depart before 6 am were the most punctual (97.5% on time); flights scheduled to depart 9 pm to 10 pm were the least (53.5%).
  • In the other direction, Las Vegas (LAS) to Denver (DEN), 75.7% of flights were on time and 0.8% were cancelled. Compare airlines LAS to DEN.

Best and worst months to fly DEN to LAS

Jan 76.6%
Feb 76.3%
Mar 74.2%
Apr 75.4%
May 72.0%
Jun 65.4%
Jul 64.5%
Aug 69.4%
Sep 74.4%
Oct 76.9%
Nov 81.7%
Dec 81.2%
Share of scheduled flights on time 12-month average 74.9%
All airlines combined, by calendar month, September 2023 to August 2026 (3 years pooled). Scale starts at zero.
Show as table
PeriodOn timeFlights
January 76.6% 1,871
February 76.3% 1,856
March 74.2% 2,163
April 75.4% 2,100
May 72.0% 2,089
June 65.4% 1,791
July 64.5% 1,777
August 69.4% 1,697
September 74.4% 1,961
October 76.9% 2,154
November 81.7% 1,962
December 81.2% 1,914
Best and worst calendar month by airline, September 2023 to August 2026.
AirlineBest monthWorst month
United Airlines December (84.1%) July (60.1%)
Frontier Airlines November (81.4%) June (62.9%)
Southwest Airlines November (80.6%) July (64.9%)

Month by month, last 12 months

Sep 70.9%
Oct 74.3%
Nov 79.6%
Dec 74.3%
Jan 83.2%
Feb 83.6%
Mar 78.5%
Apr 78.8%
May 76.2%
Jun 64.8%
Jul 67.2%
Aug 66.5%
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 70.9% 537
Oct 2025 74.3% 653
Nov 2025 79.6% 594
Dec 2025 74.3% 560
Jan 2026 83.2% 564
Feb 2026 83.6% 567
Mar 2026 78.5% 666
Apr 2026 78.8% 646
May 2026 76.2% 640
Jun 2026 64.8% 593
Jul 2026 67.2% 586
Aug 2026 66.5% 562

Best and worst departure times

<6a 97.5%
6a 93.7%
7a 91.5%
8a 92.3%
9a 85.8%
10a 79.9%
11a 80.3%
12p 77.8%
1p 75.2%
2p 69.6%
3p 66.9%
4p 65.5%
5p 65.5%
6p 71.6%
7p 59.5%
8p 64.0%
9p 53.5%
10p 69.5%
Share of scheduled flights on time
By scheduled local departure hour at DEN, 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 97.5% 120
Departing 6 am to 7 am 93.7% 318
Departing 7 am to 8 am 91.5% 506
Departing 8 am to 9 am 92.3% 431
Departing 9 am to 10 am 85.8% 493
Departing 10 am to 11 am 79.9% 403
Departing 11 am to noon 80.3% 542
Departing noon to 1 pm 77.8% 334
Departing 1 pm to 2 pm 75.2% 525
Departing 2 pm to 3 pm 69.6% 207
Departing 3 pm to 4 pm 66.9% 332
Departing 4 pm to 5 pm 65.5% 591
Departing 5 pm to 6 pm 65.5% 441
Departing 6 pm to 7 pm 71.6% 204
Departing 7 pm to 8 pm 59.5% 704
Departing 8 pm to 9 pm 64.0% 447
Departing 9 pm to 10 pm 53.5% 187
Departing 10 pm to 11 pm 69.5% 383
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 Denver, CO (DEN) to Las Vegas, NV (LAS), 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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