Route reliability record
LAS→BOS
Las Vegas to Boston
- Flights
- 1,597
- Period
- September 2025 to August 2026
- Distance
- 2,381 mi
- Carriers
- 2
This route sits in the middle of the pack with a C. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 1,597 LAS to BOS flights, of which JetBlue Airways flew 1,046 at 75.1% on time.
Best time to fly LAS to BOS: a 2pm–5pm departure, ideally on a Tuesday. Flights in that window arrived on time 79.9% of the time and Tuesday flights 82.6%, against 74.6% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
74.6%
Arrivals under 15 minutes late, of 1,567 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
1.63%
National rate is 1.89%
Best carrier
JetBlue
75.1% on time across 1,046 flights
These figures cover 1,597 flights between September 2025 and August 2026. Beyond the headline rate, 11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Which airline is most reliable on LAS to BOS
The two carriers here are closely matched: about a point separate the best from the worst. At that spread, schedule and price are better tie-breakers than reliability. Sample sizes are shown so you can see which rows are worth weighing.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| JetBlue Airways | 1,046 | 75.1% | 95 min | 1.72% | B |
| Delta Air Lines | 551 | 73.7% | 77 min | 1.45% | C |
No carrier stands out. JetBlue tops the table at 75.1%, about a point clear of the bottom, which is inside the range this kind of sample moves year to year.
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Best ways to make this trip
The most reliable ways to fly Las Vegas to Boston
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. LAS → BOSLas Vegas to Boston | JetBlue Airways | 73.8% | 75.1% | 1.72% | 2pm–5pm, Tue | — |
| 2. LAS → BOSLas Vegas to Boston | Delta Air Lines | 72.6% | 73.7% | 1.45% | 8pm–5am, Tue | — |
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 11 points, against about a point between the best and worst carrier.
- 5am–8am30 flights—
- 8am–11am292 flights69.2%
- 11am–2pm530 flights72.2%
- 2pm–5pm212 flights79.9%
- 5pm–8pm—
- 8pm–5am533 flights76.8%
Scale runs 60% to 85%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 2pm–5pm slot at 79.9% on time, ahead of 8am–11am at 69.2%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 8pm–5am window is the busiest, with 533 flights scheduled in it.
Explore
Filter LAS to BOS 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 LAS to BOS, the best departure window is 2pm–5pm at 79.9% on time and the worst is 8am–11am at 69.2%, a wide gap of 10.7 points. All US flights leaving 2pm–5pm ran 71.9%.
- 5–8am—
- 8–11am69.2%
- 11am–2pm72.2%
- 2–5pm79.9%
- 5–8pm—
- 8pm–5am76.8%
best all US flightsScale 60% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 30 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.
July is the worst month at 56.7% on time, 30 points below June, the best at 87.1%. 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. March was the busiest month here, with 168 flights.
Across the week, Tuesday is the strongest day at 82.6% on time and Sunday the weakest at 67.5%, a spread of 15 points.
Delay causes
Why this route gets delayed
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 35,000 reported delay minutes.
- 34%National Airspace System
- 32%Late-arriving aircraft
- 31%Carrier
- 3%Extreme weather
- 0%Security
34% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 12,000 minutes out of 35,000, against a national NAS share of 21%. The split is drawn from 35,330 reported delay minutes.
Cancellations sit at 1.63% against a national 1.89%, which is ordinary. Diversions add another 0.25%.
Connections and stage length
What a delay here actually costs
11.6% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
At 2,381 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 74.7% on time across 1,596 flights, within half a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
The sample behind these figures is 1,597 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 BOS 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. June runs 87.1% on time and July 56.7%, a swing of 30 points. If the dates move at all, move them out of July before you think about anything else. 1,567 completed flights over 12 months sit behind that.
Common questions
LAS to BOS questions
How often is LAS to BOS delayed?
About one flight in four arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 25.4% of the 1,597 flights in this analysis, against 22.7% nationally. Delayed flights are late by an hour and a half on average.
Which airline is most reliable on LAS to BOS?
JetBlue Airways leads at 75.1% on time across 1,046 flights. Delta Air Lines is at the other end on 73.7%, a gap of about a point. 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 LAS to BOS?
The 2pm–5pm departure window is the strongest at 79.9% on time. The 8am–11am window is the weakest at 69.2%, 11 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 July delays on LAS to BOS?
July is the weakest month at 56.7% on time, compared with 87.1% in June. Across the year that is 30 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
- BOS to LAS — the return legseparate record
- Harry Reid International (LAS) delay statistics
- Boston Logan International (BOS) delay statistics
- JetBlue Airways on LAS to BOS75.1%
- Delta Air Lines on LAS to BOS73.7%
- LAS to LAX, a related route77.9%
- DCA to BOS, a related route70.1%
- LAS to DEN, a related route76.5%
- JetBlue Airways on-time record75.1%
- Delta Air Lines on-time record73.7%
- Why the first flight of the morning is statistically safest
- How often a connection fails at the major US hubs
Direction matters. LAS to BOS and BOS to LAS 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.