BUF to LAS flight delays & on-time performance
Nonstop flights from Buffalo Niagara International Airport to Harry Reid International Airport · 1,986 miles · Aug 2025 – Jul 2026
No FAA-reported ground stops or delays at BUF or LAS right now. Individual flights can still be delayed by the airline; check with your airline for your flight.
Key facts
- Flights from Buffalo (BUF) to Las Vegas (LAS) arrived on time 82% of the time in Aug 2025 – Jul 2026, better than the 78% national average.
- 0.7% were cancelled, and 5% arrived an hour or more late.
- Southwest Airlines is the only airline reporting nonstop flights on this route.
- Departures scheduled around 6am did best (96% on time); around 12pm did worst (68%).
- Wednesday was the most reliable day to fly (91% on time) and Saturday the least (69%).
- The largest source of delay minutes was late-arriving aircraft (46%).
Which airline is most on time from BUF to LAS?
Ranked by on-time arrival rate. Regional airlines fly under their partner's brand (e.g. SkyWest for Delta Connection or United Express).
| Airline | On time | Cancelled | Avg delay | 1 hr+ late | Flights |
|---|---|---|---|---|---|
| Southwest Airlines | 82% | 0.7% | 9 min | 5.0% | 302 |
Best time of day to fly
On-time arrival rate by scheduled departure hour (local time).
- 5am88%43 flights
- 6am96%47 flights
- 7am80%22 flights
- 8am89%35 flights
- 9am85%28 flights
- 12pm68%22 flights
- 2pm78%49 flights
- 3pm73%22 flights
- 4pm88%16 flights
Best day of the week
On-time arrival rate by day of departure.
- Monday81%4.5% cancelled
- Tuesday84%0.0% cancelled
- Wednesday91%0.0% cancelled
- Thursday86%0.0% cancelled
- Friday75%0.0% cancelled
- Saturday69%0.0% cancelled
- Sunday86%0.0% cancelled
On-time trend by month
Why flights are late
Share of delay minutes by cause, as reported by airlines to the DOT.
- Late-arriving aircraft46%
- Airline (crew, maintenance, cleaning, fueling)31%
- Air traffic control & airport congestion23%
- Extreme weather0%
- Security0%
Why flights are cancelled
Share of cancellations by reason.
- Extreme weather50%
- Air traffic control & airport congestion50%
- Airline (crew, maintenance, cleaning, fueling)0%
- Security0%
BUF to LAS: common questions
- How often are BUF to LAS flights on time?
- 82% of flights arrived less than 15 minutes late in Aug 2025 – Jul 2026, compared with 78% for all US flights.
- How often are flights from Buffalo to Las Vegas cancelled?
- 0.7% of scheduled flights were cancelled (2 of 302).
- How long are typical delays?
- Across all flights the average arrival delay was 9 min (early arrivals count as zero). Flights that were late arrived 48 min behind schedule on average, and 5.0% of flights were an hour or more late.
- How long is taxi time at BUF?
- Flights on this route spent 13 min taxiing from the gate to takeoff on average.
Related routes
Return trip: LAS to BUF — 72% on time
More flights from Buffalo
Data: U.S. DOT Bureau of Transportation Statistics, Aug 2025 – Jul 2026 (12 months). Latest month published by BTS: July 2026. Route: BUF → LAS, nonstop flights by US airlines that report to the DOT. How we calculate this.