Route reliability record
FAT→LAS
Fresno to Las Vegas
- Flights
- 1,713
- Period
- September 2025 to August 2026
- Distance
- 259 mi
- Carriers
- 2
This route lands a B+, 4 points better than the national rate of 77.3%. Roughly one flight in five arrives 15 minutes late or worse, and those flights are late by a little over an hour on average. That rests on 1,713 FAT to LAS flights, of which Southwest Airlines flew 1,072 at 85.1% on time.
Best time to fly FAT to LAS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 97.0% of the time and Saturday flights 88.2%, against 81.6% for the route overall.
Set against the rest of the country, this route's record is 4 points better than the US average of 77.3%. That gap is worth roughly 43 fewer late arrivals for every thousand flights.
Key figures
On time
81.6%
Arrivals under 15 minutes late, of 1,705 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
0.41%
National rate is 1.89%
Best carrier
Southwest
85.1% on time across 1,072 flights
These figures cover 1,713 flights between September 2025 and August 2026. The median arrival is 10 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.
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Carrier by carrier
Which airline is most reliable on FAT to LAS
The choice of carrier is not cosmetic here. Southwest Airlines arrives on time 85.1% of the time; Allegiant Air manages 75.7%. Sample sizes sit next to every figure, because a two-point gap across 641 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Southwest Airlines | 1,072 | 85.1% | 59 min | 0.28% | A+ |
| Allegiant Air | 641 | 75.7% | 94 min | 0.62% | B+ |
Southwest leads Allegiant by 9 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
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Best ways to make this trip
The most reliable ways to fly Fresno to Las Vegas
Every airline on this route, ranked by how often a scheduled flight actually operated and arrived on time, with its best departure time and most punctual flight number. No nearby airport pair beat these.
| Option | Airline | Success | On time | Cancelled | Best departure | Most punctual flight |
|---|---|---|---|---|---|---|
| 1. FAT → LASFresno to Las Vegas | Southwest Airlines | 84.9% | 85.1% | 0.28% | 5am–8am, Sat | — |
| 2. FAT → LASFresno to Las Vegas | Allegiant Air | 75.2% | 75.7% | 0.62% | 8am–11am, Wed | — |
Success is the share of scheduled flights that operated and arrived less than 15 minutes late, so a cancelled flight counts against it. “(route)” means the best time comes from every carrier on the route rather than this airline alone.
Departure window
The best time of day to leave
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 29 points, against 9 points between the best and worst carrier.
- 5am–8am365 flights97.0%
- 8am–11am316 flights90.2%
- 11am–2pm266 flights83.1%
- 2pm–5pm473 flights68.0%
- 5pm–8pm219 flights73.2%
- 8pm–5am74 flights74.3%
Scale runs 60% to 100%.
Book the early departure. Flights leaving between 5am–8am arrive on time 97.0% of the time, against 68.0% for the afternoon window. That is 29 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 2pm–5pm window is the busiest, with 473 flights scheduled in it.
Explore
Filter FAT to LAS by airline, time, month and day
Pick a breakdown and a carrier. The dashed mark on each row is the same slice for every US flight.
On FAT to LAS, the best departure window is 5am–8am at 97.0% on time and the worst is 2pm–5pm at 68.0%, a wide gap of 29.0 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am97.0%
- 8–11am90.2%
- 11am–2pm83.1%
- 2–5pm68.0%
- 5–8pm73.2%
- 8pm–5am74.3%
best all US flightsScale 60% to 100%.
Across the year
When delays peak on this route
This route's year swings by 18 points from best month to worst, which is wide. An annual average tells you very little about the week you are actually flying, so read the strip rather than the headline if your dates are fixed.
June is the worst month at 71.3% on time, 18 points below February, the best at 89.5%. Summer afternoon convection and peak-season schedules land on the same weeks every year, so this is a pattern you can book around rather than a run of bad luck. July was the busiest month here, with 151 flights.
Across the week, Saturday is the strongest day at 88.2% on time and Friday the weakest at 72.2%, a spread of 16 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 51% of the 24,000 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 24%National Airspace System
- 18%Carrier
- 6%Extreme weather
- 0%Security
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 24,000 reported delay minutes here, that single category outweighs weather by 9 to one. The split is drawn from 23,820 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 97.0% on time here.
Cancellations are rare at 0.41%, below the national 1.89% and low enough to earn the plus on the grade. Roughly one flight in 100 is called off; the risk here is arriving late, not not arriving.
Connections and stage length
What a delay here actually costs
7.4% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.
At 259 miles this is a short hop, and stage length matters more than it looks. A flight this short spends under two hours in the air, which leaves almost nothing to claw back a late pushback with. Delay here is decided on the ground, in the turn, which is why the 5am–8am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 77.0% on time across 1,713 flights, 5 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
The sample behind these figures is 1,713 flights, enough that the headline rate is stable to within roughly a point. The hour-block and month splits divide that further, so read the thinner bars with more caution than the headline.
Work out the risk of missing a connection in LAS after this flight
What to do with this
Booking this route
Put together: the calendar is the biggest lever here, not the carrier or the hour. February runs 89.5% on time and June 71.3%, a swing of 18 points. If the dates move at all, move them out of June before you think about anything else. 1,705 completed flights over 12 months sit behind that.
Common questions
FAT to LAS questions
How often is FAT to LAS delayed?
Roughly one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 18.4% of the 1,713 flights in this analysis, against 22.7% nationally. Delayed flights are late by a little over an hour on average.
Which airline is most reliable on FAT to LAS?
Southwest Airlines leads at 85.1% on time across 1,072 flights. Allegiant Air is at the other end on 75.7%, a gap of 9 points. Sample size matters as much as the percentage: a rate built from a few hundred flights moves around far more than one built from ten thousand.
What time of day has the fewest delays on FAT to LAS?
The 5am–8am departure window is the strongest at 97.0% on time. The 2pm–5pm window is the weakest at 68.0%, 29 points behind. Later departures inherit delays from earlier flights the same aircraft has already flown, which is why the curve slopes the way it does.
How bad are June delays on FAT to LAS?
June is the weakest month at 71.3% on time, compared with 89.5% in February. Across the year that is 18 points between the best and worst months. Moving flexible dates out of that month is one of the few things that reliably helps.
Related
Where to go next
- LAS to FAT — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Southwest Airlines on FAT to LAS85.1%
- Allegiant Air on FAT to LAS75.7%
- FAT to SAN, a related route73.2%
- LAX to LAS, a related route75.8%
- FAT to PHX, a related route81.1%
- Southwest Airlines on-time record85.1%
- Allegiant Air on-time record75.7%
- Why the first flight of the morning is statistically safest
- The best time of day to fly, according to 7.05 million flight records
Direction matters. FAT to LAS and LAS to FAT are scored separately because they are separate operations, with different departure banks and different aircraft. Compare the return leg.
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Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.