Carrier route record
YXBUF→BOS
Republic Airways · Buffalo to Boston
- Flights
- 386
- Period
- September 2025 to August 2026
- Share of route
- 29%
- Carriers
- 3
Historical statistics for September 2025 to August 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 9 points better than the national rate of 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 386 flights, with a median arrival 16 minutes early.
Set against the rest of the country, Republic's BUF to BOS record is 9 points better than the US average of 77.3%. That gap is worth roughly 85 fewer late arrivals for every thousand flights.
Key figures
On time
85.8%
Arrivals under 15 minutes late, of 374 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
3.11%
National rate is 1.89%
Whole route
75.7%
Every carrier on BUF to BOS, 1,349 flights
These figures cover 386 flights between September 2025 and August 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.
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Carrier by carrier
Republic against every carrier on BUF to BOS
Republic flew 386 of the 1,349 flights on BUF to BOS, about 29% of it. Its 85.8% on time is 10 points better than the route as a whole, which runs 75.7%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 85.8% to JetBlue at 71.4%. 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) | 386 | 85.8% | 75 min | 3.11% | A− |
| Envoy Airthin sample | 75 | 74.7% | 101 min | 0.00% | C+ |
| JetBlue Airways | 888 | 71.4% | 78 min | 3.94% | C− |
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 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 32 points, against half a point between the best and worst carrier.
- 5am–8am129 flights93.5%
- 8am–11am39 flights97.4%
- 11am–2pm107 flights91.4%
- 2pm–5pm76 flights65.3%
- 5pm–8pm35 flights71.4%
- 8pm–5am—
Scale runs 55% to 100%. Rows with fewer than 30 flights show a dash.
Book the morning departure. Flights leaving between 8am–11am arrive on time 97.4% of the time, against 65.3% for the afternoon window. That is 32 points of difference for no extra money, and it comes from the same aircraft having had no earlier flight to fall behind on. The 5am–8am window is the busiest, with 129 flights scheduled in it.
Across the year
Republic on BUF to BOS through the year
- Apr–Jun 2026221 flights85.3%
- Jul–Sep 2026165 flights86.5%
Scale runs 75% to 90%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 85.8% on time across 386 flights.
Split by quarter, Republic on BUF to BOS logged 221 flights in Apr–Jun 2026 and 165 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 85.8% annual figure is the one to use.
Across the week, Monday is the strongest day at 91.7% on time and Thursday the weakest at 78.7%, a spread of 13 points.
Arrival by arrival
How late Republic on BUF to BOS runs when it is late
Republic on BUF to BOS often beats the schedule: 200 of 374 completed flights, 53%, arrived 15 minutes or more early. When Republic on BUF to BOS is late it tends to be very late: 27 of its 53 late arrivals were an hour or more behind, and 10 were two hours or more.
- 15+ min early200 flights53.5%
- Within 15 min121 flights32.4%
- 15–29 min late13 flights3.5%
- 30–59 min late13 flights3.5%
- 1–2 hours late17 flights4.5%
- 2+ hours late10 flights2.7%
Scale runs 0% to 100%.
Share of 374 completed flights by arrival against schedule.
10 of 57 late departures made up the time and arrived on time, 18% of them. Only 6 left on time and still arrived late.
The worst days
Worst days for Republic on BUF to BOS
The latest arrival of the period was on 18 April 2026, 5 hours 3 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). Three of the five worst days fell in July 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 18 April 2026 | 5 hours 3 minutes | Carrier |
| 1 July 2026 | 3 hours 14 minutes | National Airspace System |
| 7 July 2026 | 3 hours 10 minutes | National Airspace System |
| 22 July 2026 | 2 hours 58 minutes | National Airspace System |
| 27 August 2026 | 2 hours 56 minutes | Late-arriving aircraft |
Delay causes
Why Republic runs late on this route
National Airspace System accounts for 58% of the 3,981 delay minutes carriers reported here, and the remaining four split what is left.
- 58%National Airspace System
- 23%Late-arriving aircraft
- 19%Carrier
58% 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 2,301 minutes out of 3,981, against a national NAS share of 21%. The split is drawn from 3,981 reported delay minutes.
Cancellations run at 3.11%, 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 costs
7.2% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over 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 8am–11am window matters as much as it does.
The return leg is a different operation and performs like one: it runs 82.8% on time across 386 flights, 3 points below 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. 386 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: the delay figures matter less here than the 3.11% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 8am–11am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 374 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.