Carrier route record
B6BOS→BUF
JetBlue Airways · Boston to Buffalo
- Flights
- 887
- Period
- September 2025 to August 2026
- Share of route
- 66%
- Carriers
- 3
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with JetBlue Airways.
JetBlue on BOS to BUF carries a cancellation problem, not just a delay problem: 4.0% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, about seven flights in ten arrive on time, worth a C− overall. The punctuality figure counts only flights that actually departed, so it flatters an operation that cancels this often. That rests on 887 flights, with a median arrival 5 minutes early.
The national on-time rate over the same period is 77.3%, so JetBlue on BOS to BUF runs 9 points behind the country as a whole. Across a thousand flights that is about 91 extra late arrivals.
Key figures
On time
68.2%
Arrivals under 15 minutes late, of 852 completed flights
Avg delay
76 min
Across delayed arrivals only, not all flights
Cancelled
3.95%
National rate is 1.89%
Whole route
73.3%
Every carrier on BOS to BUF, 1,349 flights
These figures cover 887 flights between September 2025 and August 2026. Beyond the headline rate, 15.5% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Carrier by carrier
JetBlue against every carrier on BOS to BUF
JetBlue flew 887 of the 1,349 flights on BOS to BUF, most of the route. Its 68.2% on time is 5 points worse than the route as a whole, which runs 73.3%. Ranked by on-time rate it is last of three carriers on the route, where the range runs from Envoy at 84.2% to JetBlue at 68.2%. One of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Airthin sample | 76 | 84.2% | 75 min | 0.00% | B+ |
| Republic Airways | 386 | 82.8% | 72 min | 3.37% | B− |
| JetBlue Airways (this page) | 887 | 68.2% | 76 min | 3.95% | C− |
Flight by flight
JetBlue flight numbers on BOS to BUF
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Departure window
When JetBlue runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 41 points, against half a point between the best and worst carrier.
- 5am–8am50 flights92.0%
- 8am–11am157 flights74.8%
- 11am–2pm159 flights82.1%
- 2pm–5pm145 flights70.5%
- 5pm–8pm214 flights51.2%
- 8pm–5am162 flights60.3%
Scale runs 45% to 95%.
The 5pm–8pm window is where this operation falls apart: 51.2% on time, against 92.0% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5pm–8pm window is the busiest, with 214 flights scheduled in it.
Across the year
JetBlue on BOS to BUF through the year
December is the weak month at 53.0% on time, against 83.5% in May. Winter delays cluster: a single storm system can account for most of a month's shortfall, so an average December hides both very good weeks and genuinely unflyable days. October was the busiest month here, with 106 flights.
Across the week, Saturday is the strongest day at 74.5% on time and Thursday the weakest at 62.1%, a spread of 12 points.
Arrival by arrival
How late JetBlue on BOS to BUF runs when it is late
JetBlue on BOS to BUF often beats the schedule: 225 of 852 completed flights, 26%, arrived 15 minutes or more early. The 271 late arrivals split 64 under half an hour, 75 between 30 and 60 minutes, and 132 an hour or more.
- 15+ min early225 flights26.4%
- Within 15 min356 flights41.8%
- 15–29 min late64 flights7.5%
- 30–59 min late75 flights8.8%
- 1–2 hours late87 flights10.2%
- 2+ hours late45 flights5.3%
Scale runs 0% to 100%.
Share of 852 completed flights by arrival against schedule.
36 of 288 late departures made up the time and arrived on time, 13% of them. 19 flights left on time and still arrived late.
The worst days
Worst days for JetBlue on BOS to BUF
The latest arrival of the period was on 10 August 2026, 5 hours 41 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 August 2026 | 5 hours 41 minutes | Late-arriving aircraft |
| 26 January 2026 | 5 hours 38 minutes | Extreme weather |
| 22 June 2026 | 5 hours 33 minutes | Late-arriving aircraft |
| 10 October 2025 | 5 hours 6 minutes | Late-arriving aircraft |
| 5 December 2025 | 5 hours | Late-arriving aircraft |
Delay causes
Why JetBlue runs late on this route
Late-arriving aircraft accounts for 61% of the 20,000 delay minutes carriers reported here, and the remaining four split what is left.
- 61%Late-arriving aircraft
- 24%Carrier
- 11%National Airspace System
- 4%Extreme weather
- 0%Security
61% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 20,000 reported delay minutes here, that single category outweighs weather by 15 to one. The split is drawn from 20,466 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 92.0% on time here.
Cancellations run at 3.95%, against 1.89% nationally. That is about one flight in 25 cancelled outright. A cancelled flight is invisible in every on-time figure on this page, so the punctuality numbers above describe only the flights that actually operated.
Connections and stage length
What a delay here costs
15.5% 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 395 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 71.4% on time across 888 flights, 3 points above 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 3 points of difference.
One caution: this is a thin sample. 887 flights over twelve months is enough to clear this site's floor but not enough to pin the rate down tightly, and a single bad week moves it by more than a point. Treat the grade as a rough reading.
What to do with this
Booking JetBlue on BOS to BUF
Put together: the delay figures matter less here than the 3.95% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 852 completed flights over 12 months sit behind that.
Related
Where to go next
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.