Harry Reid (LAS) Flight Delays: Rate, Worst Hours and Live Risk
Harry Reid (LAS) is ranked 11 of 22 for delays among DelayGuard's guide airports (1 is the highest rate): 23.2% of flights departing LAS arrived 15 or more minutes late across 556,960 flights, January 2023 to December 2025. Southwest Airlines operated 46.0% of those departures, with a 25.2% delay rate of its own. The worst scheduled departure hours are 6 PM (33.5%) and 7 PM (33.1%); 5 AM is the best at 5.8%. 0.82% of scheduled LAS departures were cancelled in 2024 to 2025.
Delay window: January 2023 to December 2025. Cancellation window: 2024 to 2025. Last updated: 2026-10-01. Delayed means a flight arrived 15 or more minutes after its scheduled arrival, the BTS and DOT on-time standard. Cancelled and diverted flights are excluded from delay rates. Historical BTS figures are separate from DelayGuard's per-flight model probability and from live FAA, weather and ground-delay status.
Predict a LAS flight
Historical BTS on-time (15+ min) at LAS
Sample size: 556,960 flights, window: January 2023 to December 2025. Delay rate 23.2%. Cancellation rate 0.82% of 373,055 scheduled flights, 2024 to 2025.
Why LAS runs the way it does
Southwest Airlines flew 46.0% of LAS departures in the window, and its flights ran 25.2% late against 23.2% for the airport as a whole. With one carrier that large, LAS's delay record largely follows how Southwest Airlines runs its schedule.
LAS delays peak in July (31.5%), June (28.5%) and May (25.9%) and are lowest in November (16.3%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.
Delays build through the day: 9.8% of flights scheduled before 8 AM ran late against 27.4% after 8 PM. That is the pattern BTS describes as late-arriving aircraft, where a previous flight with the same aircraft arriving late makes the next departure late.
Spirit Airlines flew 12.5% of LAS departures in this history. Spirit stopped flying on 2 May 2026, so today's carrier mix differs from the one behind these figures.
Best and worst times to fly from LAS
LAS delay rate by scheduled departure hour (hours with 100+ flights)| Hour | Delayed 15+ min | Flights |
|---|
| 12 AM | 18.6% | 7,458 |
| 1 AM | 23.6% | 1,868 |
| 5 AM | 5.8% | 14,270 |
| 6 AM | 7.2% | 39,555 |
| 7 AM | 11.6% | 35,409 |
| 8 AM | 13.9% | 36,221 |
| 9 AM | 16.1% | 38,814 |
| 10 AM | 18.2% | 34,133 |
| 11 AM | 21.7% | 33,065 |
| 12 PM | 25.5% | 31,727 |
| 1 PM | 28.4% | 32,734 |
| 2 PM | 30.9% | 28,629 |
| 3 PM | 31.8% | 30,677 |
| 4 PM | 32.0% | 29,927 |
| 5 PM | 32.3% | 31,496 |
| 6 PM | 33.5% | 27,445 |
| 7 PM | 33.1% | 25,090 |
| 8 PM | 32.8% | 19,969 |
| 9 PM | 31.3% | 19,759 |
| 10 PM | 25.7% | 18,144 |
| 11 PM | 20.1% | 20,563 |
LAS delays and cancellations by month
LAS by month| Month | Delayed 15+ min | Flights | Cancelled |
|---|
| Jan | 21.0% | 44,817 | 1.81% |
| Feb | 20.7% | 41,807 | 0.85% |
| Mar | 25.8% | 47,878 | 0.77% |
| Apr | 23.8% | 46,912 | 0.32% |
| May | 25.9% | 48,783 | 0.57% |
| Jun | 28.5% | 46,359 | 0.73% |
| Jul | 31.5% | 46,708 | 1.90% |
| Aug | 24.0% | 46,132 | 0.67% |
| Sep | 21.4% | 45,780 | 0.42% |
| Oct | 21.0% | 50,044 | 0.33% |
| Nov | 16.3% | 46,025 | 0.95% |
| Dec | 17.9% | 45,715 | 0.51% |
Airlines at LAS
Carriers flying from LAS (1,000+ flights)| Airline | Share of departures | Delayed 15+ min | Flights | Cancelled |
|---|
| Southwest Airlines | 46.0% | 25.2% | 256,251 | 0.56% |
| Spirit Airlines (ceased 2 May 2026) | 12.5% | 21.6% | 69,789 | 1.03% |
| Delta Air Lines | 8.5% | 16.2% | 47,341 | 0.66% |
| United Airlines | 7.6% | 19.1% | 42,273 | 1.13% |
| American Airlines | 7.4% | 20.7% | 41,255 | 1.24% |
| Frontier Airlines | 7.0% | 26.9% | 38,760 | 1.32% |
| Allegiant Air | 4.1% | 20.2% | 22,902 | 0.48% |
| Alaska Airlines | 2.9% | 23.4% | 16,037 | 1.64% |
| JetBlue Airways | 1.7% | 28.6% | 9,337 | 0.93% |
| SkyWest Airlines | 1.6% | 26.5% | 8,654 | 1.15% |
Regional operators are reported separately from the airline brands they fly for.
Routes from LAS
Routes from LAS (500+ flights)| Route | Delayed 15+ min | Flights | Cancelled | Link |
|---|
| LAS to LAX | 24.1% | 28,583 | 0.62% | Route page |
| LAS to DEN | 24.9% | 24,384 | 1.02% | Route page |
| LAS to SAN | 31.0% | 20,542 | 1.10% | Predict |
| LAS to PHX | 22.3% | 20,120 | 0.86% | Route page |
| LAS to SEA | 21.2% | 19,166 | 0.94% | Route page |
| LAS to SFO | 31.8% | 17,236 | 1.13% | Route page |
| LAS to DFW | 23.0% | 17,110 | 2.22% | Route page |
| LAS to SMF | 22.3% | 16,112 | 0.62% | Predict |
| LAS to ORD | 20.8% | 15,769 | 1.19% | Route page |
| LAS to ATL | 19.0% | 14,863 | 1.04% | Route page |
| LAS to OAK | 26.1% | 13,751 | 0.43% | Predict |
| LAS to SJC | 20.6% | 13,118 | 0.47% | Predict |
| LAS to BUR | 22.2% | 12,985 | 1.37% | Predict |
| LAS to SLC | 20.2% | 12,741 | 0.58% | Predict |
| LAS to SNA | 21.2% | 12,474 | 0.66% | Predict |
Questions
- How often are flights delayed at LAS?
- 23.2% of flights departing LAS arrived 15 or more minutes late across 556,960 flights, January 2023 to December 2025 (BTS). Across all US domestic flights in the data, the rate is 21.2%.
- What is the best time to fly from LAS?
- Early departures run best. 5 AM flights ran 5.8% late (14,270 flights), 6 AM flights ran 7.2% late (39,555 flights) and 7 AM flights ran 11.6% late (35,409 flights). The worst hours are 6 PM (33.5%), 7 PM (33.1%) and 8 PM (32.8%).
- Which month is worst for delays at LAS?
- July has the highest delay rate at 31.5%. November is the lowest at 16.3%.
- Which airline has the best on-time record at LAS?
- Among carriers still flying with at least 5,000 flights from LAS, Delta Air Lines has the lowest delay rate at 16.2% (47,341 flights). JetBlue Airways is highest at 28.6%. Regional operators such as SkyWest are reported separately from the airline brands they fly for.
- How often are LAS flights cancelled?
- 0.82% of 373,055 scheduled departures from LAS were cancelled in 2024 to 2025. The US figure over the same period is 1.41%. See the full ranking on the cancellation rates page.
- Does DelayGuard show live delays at LAS?
- Yes. The live module on this page shows DelayGuard's hourly risk score and any active FAA ground stop or ground delay program. It is separate from the historical BTS figures above. For a specific flight, the predictor gives a model probability that combines history, weather and FAA data.
- Why does LAS have delays?
- Southwest Airlines flew 46.0% of LAS departures in the window, and its flights ran 25.2% late against 23.2% for the airport as a whole. With one carrier that large, LAS's delay record largely follows how Southwest Airlines runs its schedule. LAS delays peak in July (31.5%), June (28.5%) and May (25.9%) and are lowest in November (16.3%). That shape is consistent with the summer thunderstorm season, when convective weather builds through the afternoon and slows arrivals and departures.