Route profile
LAS→BOS
Flight reliability, delays and best times to fly from Las Vegas to Boston, 2,381 miles.
Right now
Aviation weather is not currently a factor.
Aviation weather is not currently a factor.
Route reliability
July 2023 – July 2026
Better than 30% of comparable major US routes (4,598 compared)
Calculated from 5,168 flights. How this is calculated · What counts as on time
LAS → BOS arrives on time 76.3% of the time; the return trip, BOS → LAS, arrives on time 76.9% of the time.
LAS → BOS spends 29.6 minutes on the ground on a 2,381-mile trip: 19.3 minutes from pushback to wheels-up at LAS and 10.2 minutes from touchdown to gate at BOS.
Source: US DOT Bureau of Transportation Statistics · Data covering July 2023 – July 2026
What stands out
Unlike most, it barely matters what time you fly this route, a steadier spread than 98% of 4,023 comparable routes.
79.6% on time for 6–9 PM departures, against 75.2% for 9 AM–12 PM, a narrow gap either way.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · Ranked against every other route with the same kind of figure and at least 4,023 in the comparison.
What sets this route apart
Where LAS to BOS differs most from similar routes by hour, weekday, month and airline, July 2023 – July 2026.
LAS to BOS is at its best against routes of similar length for flights scheduled at 8 PM: 79.6% arrive on time, 10.2 points ahead of the 69.4% those routes manage at that hour. Against all other routes the gap is 12.2 points.
LAS to BOS struggles most at 10 PM: 75.7% of its flights scheduled then arrive on time, 6.2 points behind the 81.9% on routes of similar length at the same hour.
Sunday is the day LAS to BOS slips furthest against routes of similar length, 68.5% on time where they average 76.1%, 7.6 points lower. Against all other routes the gap is 6.3 points.
In July, LAS to BOS runs 11 points below routes of similar length, 59.4% on time to 70.4%. Against all other routes the gap is 10.3 points.
Delta Air Lines’ flights on LAS to BOS arrive on time 78.4% of the time, 2.8 points below the 81.2% it manages on its routes of similar length. Against all other routes the gap is 3.1 points.
LAS to BOS against comparable routes
July 2023 – July 2026| Measure | This route | Compared with | Them | Gap | Flights behind it |
|---|---|---|---|---|---|
| Hour: 8 PM departures | 79.6% | routes of similar length | 69.4% | +10.2 pts | 137 here, 36,225 there |
| Hour: 10 PM departures | 75.7% | routes of similar length | 81.9% | −6.2 pts | 959 here, 64,675 there |
| Weekday: Sunday | 68.5% | routes of similar length | 76.1% | −7.6 pts | 759 here, 158,925 there |
| Month: July | 59.4% | routes of similar length | 70.4% | −11.0 pts | 438 here, 130,158 there |
| Airline: Delta Air Lines | 78.4% | routes of similar length | 81.2% | −2.8 pts | 1,833 here, 215,241 there |
Each comparison pools the flights of other routes, with this route’s own left out. Similar length means within 15% of this route’s 2,381 miles, with at least 5 such routes. A bucket is set against the most comparable group that has enough flights: similar length, then the same origin (at least 3 routes), then all other routes. Hours, weekdays and months appear only where both sides have 120 completed flights, and airlines where both have 600. The gap must be at least 2 points and 2 standard errors, and only the largest gap each way is kept per measure. These are differences in the flights counted, not causes.
Why LAS → BOS flights are cancelled
July 2023 – July 2026
LAS → BOS cancelled 52 of 5,168 scheduled flights — about 1 in every 99. The reason filed most often was the airline, 50.0% of the cancellations coded on this route — about 1 in every 199 scheduled flights.
Share of cancellations
Of 52 cancelled departures carrying a reason code.
What each reason means
Crew, maintenance, aircraft cleaning, baggage or fueling: what BTS counts as within the carrier’s own control.
26 cancellations, 50.0% of the total.
Conditions the carrier judged severe enough to stop the flight: a blizzard, a hurricane, a line of thunderstorms.
24 cancellations, 46.2% of the total.
Airport capacity, air traffic control flow programs, heavy traffic and ordinary bad weather. A system decision, not the airline’s.
2 cancellations, 3.8% of the total.
A terminal evacuation, a security breach, screening equipment failure, or screening queues over 29 minutes.
0 cancellations, 0.0% of the total.
Reason codes are the operating airline’s own filing with US DOT, not an independent finding of fault. With only one or two carriers on the route, the split mostly reflects how they file. Ordinary bad weather is filed under air traffic, so weather’s full share is larger than its bar.
52 coded cancellations were recorded on LAS → BOS; the section appears from 50.
When it goes wrong
July 2023 – July 2026
59 min late
against a median of 8 min early
LAS → BOS has an average that understates its risk: a typical arrival is 8 min early, but the worst tenth are 67 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 5,168 operations; cancelled and diverted flights are counted separately.
Will your connection be tight enough?
Layovers at BOS after arriving from LAS.
| Connection time | Chance of missing | Reads as |
|---|---|---|
| 30 min | 38% | Likely to miss |
| 45 min | 23% | High risk |
| 60 min | 16% | High risk |
| 90 min | 9.8% | Some risk |
| 120 min | 5.8% | Some risk |
This is one leg of a connection. Gate changes and the next flight's own schedule matter too. And a connection can fail before delay is even the question — this route cancels 1.01% of the time and diverts 0.83% of the time, which a late arrival never shows up in.
Chance of missing is the share of 5,073 arrivals on this route that landed later than the connection time less 30 minutes to reach the next gate.
The worst tenth of arrivals on this route land at least 59 minutes late (90th-percentile gate arrival delay), over 5,168 operations.
Any other layover length: connection checker.
Best time to fly
LAS → BOS flights departing 6–9 PM arrived on time 79.6% of the time, against 75.2% for 9 AM–12 PM departures, a gap of 4.4 percentage points.
By departure window
By departure hour
- 12 AM to 9 AM: too few flights to score
- 10 AM: 77.9% on time from 776 flights
- 11 AM: 74.7% on time from 901 flights
- 12 PM: 75.2% on time from 546 flights
- 1 PM: too few flights to score
- 2 PM: 73.0% on time from 261 flights
- 3 PM: 77.8% on time from 275 flights
- 4 PM to 7 PM: too few flights to score
- 8 PM: 79.6% on time from 140 flights
- 9 PM: 79.2% on time from 586 flights
- 10 PM: 75.7% on time from 974 flights
- 11 PM: 76.5% on time from 417 flights
Departure windows with fewer than 120 flights are not scored.
Why LAS → BOS runs late
July 2023 – July 2026
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
screening or terminal security incidents
Share of the delay minutes US DOT attributed to each cause for LAS → BOS. Only delays of 15 minutes or more are attributed. What the five causes mean
Airlines on this route
Carriers with at least 200 flights, by the airline that operated each one.
| Carrier | Flights | On time | Cancelled | Median delay | Severe |
|---|---|---|---|---|---|
| JetBlue | 3,125 | 75.0% | 1.12% | -9 min | 11.3% |
| Delta Air Lines | 1,854 | 78.4% | 0.81% | -6 min | 8.1% |
JetBlue flew 62.8% of the 4,979 flights listed.
Delta Air Lines arrived on time 3.4 percentage points more often than JetBlue on this route.
Flights on this route
Flight numbers with at least 600 operations here and still on the schedule.
Weekly and seasonal patterns
By day of week
Tuesday is historically the most reliable day and Sunday the least, a gap of 15.3 percentage points.
By month
- Jan: 80.8%
- Feb: 78.1%
- Mar: 81.1%
- Apr: 81.7%
- May: 76.8%
- Jun: 75.7%
- Jul: 59.4%
- Aug: 69.7%
- Sep: 71.6%
- Oct: 75.9%
- Nov: 85.1%
- Dec: 80.6%
July is historically the weakest month and November the strongest, a spread of 25.7 percentage points.
Reliability over time
July 2023 – July 2026
- July 2023: 38.9% from 136 flights
- August 2023: 58.8% from 141 flights
- September 2023: 69.5% from 158 flights
- October 2023: 73.3% from 173 flights
- November 2023: 84.0% from 147 flights
- December 2023: 80.9% from 136 flights
- January 2024: too few flights to score (115)
- February 2024: too few flights to score (113)
- March 2024: 82.8% from 128 flights
- April 2024: 77.2% from 124 flights
- May 2024: 79.3% from 137 flights
- June 2024: 70.2% from 121 flights
- July 2024: too few flights to score (113)
- August 2024: 72.2% from 139 flights
- September 2024: 79.7% from 160 flights
- October 2024: 90.3% from 177 flights
- November 2024: 87.3% from 142 flights
- December 2024: 76.9% from 137 flights
- January 2025: 85.5% from 138 flights
- February 2025: 73.9% from 140 flights
- March 2025: 82.5% from 172 flights
- April 2025: 91.8% from 172 flights
- May 2025: 73.6% from 180 flights
- June 2025: 71.9% from 137 flights
- July 2025: 74.6% from 122 flights
- August 2025: too few flights to score (106)
- September 2025: 64.8% from 146 flights
- October 2025: 63.4% from 164 flights
- November 2025: too few flights to score (116)
- December 2025: 84.3% from 122 flights
- January 2026: 78.2% from 139 flights
- February 2026: 77.5% from 130 flights
- March 2026: 78.4% from 168 flights
- April 2026: 74.5% from 166 flights
- May 2026: 78.3% from 158 flights
- June 2026: too few flights to score (102)
- July 2026: too few flights to score (93)
Over the most recent 12 months (2025-08 to 2026-07), on-time arrivals averaged 75.4% against 80.4% in the 12 months before — declining by 5.0 percentage points.
Data and methodology
Calculated by FlyerIntel from 5,168 LAS → BOS flight records from the US DOT Bureau of Transportation Statistics, covering July 2023 – July 2026. Late means 15 or more minutes past scheduled arrival; cancelled and diverted flights are left out of on-time rates.
Full methodology · Data sources · Report a problem
Related research: How Long a Layover Needs to Be · Two Airlines on One Route · Best Time of Day to Fly From Major US Airports
Analysis last recomputed