Carrier route record
YXBUF→BOS
Republic Airways · Buffalo to Boston
- Flights
- 221
- Period
- July 2025 to June 2026
- Share of route
- 18%
- Carriers
- 3
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Republic Airways.
Republic on BUF to BOS earns an A. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 221 flights, with a median arrival 16 minutes early.
Set against the rest of the country, Republic's BUF to BOS record is 8 points better than the US average of 77.6%. That gap is worth roughly 77 fewer late arrivals for every thousand flights.
Key figures
On time
85.3%
Arrivals under 15 minutes late, of 218 completed flights
Avg delay
64 min
Across delayed arrivals only, not all flights
Cancelled
1.36%
National rate is 1.81%
Whole route
75.3%
Every carrier on BUF to BOS, 1,235 flights
These figures cover 221 flights between July 2025 and June 2026. The median arrival is 16 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.
Carrier by carrier
Republic against every carrier on BUF to BOS
Republic flew 221 of the 1,235 flights on BUF to BOS, about 18% of it. Its 85.3% on time is 10 points better than the route as a whole, which runs 75.3%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 85.3% to JetBlue at 73.0%. 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 |
|---|---|---|---|---|---|
| Republic Airways (this page)thin sample | 221 | 85.3% | 64 min | 1.36% | A |
| Envoy Airthin sample | 66 | 74.2% | 62 min | 0.00% | C+ |
| JetBlue Airways | 948 | 73.0% | 75 min | 2.43% | C |
Departure window
When Republic runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 23 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am72 flights92.9%
- 8am–11am6 flights—
- 11am–2pm77 flights89.6%
- 2pm–5pm31 flights70.0%
- 5pm–8pm35 flights71.4%
- 8pm–5am—
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
Book the early departure. Flights leaving between 5am–8am arrive on time 92.9% of the time, against 70.0% for the afternoon window. That is 23 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 11am–2pm window is the busiest, with 77 flights scheduled in it.
Across the year
Republic on BUF to BOS through the year
- Apr–Jun 2026221 flights85.3%
Scale runs 75% to 90%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 85.3% on time across 221 flights.
Split by quarter, Republic on BUF to BOS logged 221 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 85.3% annual figure is the one to use.
Across the week, Monday is the strongest day at 94.3% on time and Thursday the weakest at 77.1%. 17 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Republic runs late on this route
One category carries most of the weight here. National Airspace System accounts for 45% of the 2,049 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.
- 45%National Airspace System
- 30%Late-arriving aircraft
- 26%Carrier
45% 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 917 minutes out of 2,049, against a national NAS share of 21%. The split is drawn from 2,049 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 92.9% on time here.
Cancellations sit at 1.36% against a national 1.81%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
6.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.
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 83.9% on time across 221 flights, within about a point of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 221 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 Republic on BUF to BOS
Put together: treat all of this as provisional. 221 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 85.3% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 218 completed flights over 12 months sit behind that.
Related
Where to go next
- BUF to BOS, every carrier
- Republic on BOS to BUF, the return leg
- JetBlue Airways on BUF to BOS73.0%
- Republic Airways network-wide record
- Boston Logan International (BOS) delay statistics
- The best time of day to fly, according to 7.04 million flight records
- Late aircraft, weather, or the airline: what actually causes US flight delays
Source: US DOT Bureau of Transportation Statistics, on-time performance data, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.