Route reliability record
BOS→BUF
Boston to Buffalo
- Flights
- 1,349
- Period
- September 2025 to August 2026
- Distance
- 395 mi
- Carriers
- 3
This route carries a cancellation problem, not just a delay problem: 3.6% of scheduled flights never operate, against 1.9% nationally. Of the ones that do fly, close to three flights in four 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 1,349 BOS to BUF flights, of which Republic Airways flew 386 at 82.8% on time.
Best time to fly BOS to BUF: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 92.6% of the time and Saturday flights 78.6%, against 73.3% for the route overall.
The national on-time rate over the same period is 77.3%, so this route runs 4 points behind the country as a whole. Across a thousand flights that is about 40 extra late arrivals.
Key figures
On time
73.3%
Arrivals under 15 minutes late, of 1,301 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
3.56%
National rate is 1.89%
Best carrier
Republic
82.8% on time across 386 flights
These figures cover 1,349 flights between September 2025 and August 2026. Beyond the headline rate, 12.5% 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 BOS to BUF
The choice of carrier is not cosmetic here. Republic Airways arrives on time 82.8% of the time; JetBlue Airways manages 68.2%. Sample sizes sit next to every figure, because a two-point gap across 887 flights means less than a ten-point one.
| 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 | 887 | 68.2% | 76 min | 3.95% | C− |
JetBlue Airways cancels 4.0% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.
Flight by flight
Flights on BOS to BUF
The flight numbers below flew this route at least 250 times in the period, busiest first. Each has its own record, with its schedule and delay causes.
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Best ways to make this trip
The most reliable ways to fly Boston to Buffalo
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. BOS → BUFBoston to Buffalo | Republic Airways | 80.0% | 82.8% | 3.37% | 8am–11am, Sat | — |
| 2. BOS → BUFBoston to Buffalo | JetBlue Airways | 65.5% | 68.2% | 3.95% | 5am–8am, Sat | B6 715 22:10 |
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 37 points, against 15 points between the best and worst carrier.
- 5am–8am54 flights92.6%
- 8am–11am312 flights82.6%
- 11am–2pm183 flights84.4%
- 2pm–5pm267 flights78.2%
- 5pm–8pm283 flights55.5%
- 8pm–5am250 flights63.5%
Scale runs 45% to 100%.
The 5pm–8pm window is where this operation falls apart: 55.5% on time, against 92.6% 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 8am–11am window is the busiest, with 312 flights scheduled in it.
Explore
Filter BOS to BUF 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 BOS to BUF, the best departure window is 5am–8am at 92.6% on time and the worst is 5pm–8pm at 55.5%, a wide gap of 37.1 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am92.6%
- 8–11am82.6%
- 11am–2pm84.4%
- 2–5pm78.2%
- 5–8pm55.5%
- 8pm–5am63.5%
best all US flightsScale 45% to 95%.
Across the year
When delays peak on this route
This route's year swings by 34 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.
December is the weak month at 53.0% on time, against 86.7% 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. July was the busiest month here, with 183 flights.
Across the week, Saturday is the strongest day at 78.6% on time and Thursday the weakest at 69.2%, a spread of 9 points.
Delay causes
Why this route gets delayed
Late-arriving aircraft accounts for 64% of the 26,000 delay minutes carriers reported here, and the remaining four split what is left.
- 64%Late-arriving aircraft
- 23%Carrier
- 10%National Airspace System
- 3%Extreme weather
- 0%Security
64% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 26,000 reported delay minutes here, that single category outweighs weather by 20 to one. The split is drawn from 25,964 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 92.6% on time here.
Cancellations run at 3.56%, against 1.89% nationally. That is about one flight in 30 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 actually costs
12.5% 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 runs 75.7% on time across 1,349 flights, within 2 points 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 1,349 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 BUF after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.56% 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. 1,301 completed flights over 12 months sit behind that.
Common questions
BOS to BUF questions
How often is BOS to BUF 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 26.7% of the 1,349 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 BOS to BUF?
Republic Airways leads at 82.8% on time across 386 flights. JetBlue Airways is at the other end on 68.2%, a gap of 15 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 BOS to BUF?
The 5am–8am departure window is the strongest at 92.6% on time. The 5pm–8pm window is the weakest at 55.5%, 37 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 December delays on BOS to BUF?
December is the weakest month at 53.0% on time, compared with 86.7% in May. Across the year that is 34 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
- BUF to BOS — the return legseparate record
- Boston Logan International (BOS) delay statistics
- Republic Airways on BOS to BUF82.8%
- JetBlue Airways on BOS to BUF68.2%
- BOS to DCA, a related route72.6%
- ORD to BUF, a related route70.4%
- BOS to ORD, a related route71.9%
- Envoy Air on-time record84.2%
- Republic Airways on-time record82.8%
- JetBlue Airways on-time record68.2%
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
Direction matters. BOS to BUF and BUF to BOS 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.