Carrier route record

YXBOS→BUF

Republic Airways · Boston to Buffalo

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 BOS to BUF lands a B, 6 points better than the national rate of 77.6%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about 50 minutes on average. That is a workable record, not a spotless one. That rests on 221 flights, with a median arrival 18 minutes early.

Set against the rest of the country, Republic's BOS to BUF record is 6 points better than the US average of 77.6%. That gap is worth roughly 63 fewer late arrivals for every thousand flights.

On time

83.9%

Arrivals under 15 minutes late, of 218 completed flights

Avg delay

49 min

Across delayed arrivals only, not all flights

Cancelled

1.36%

National rate is 1.81%

Whole route

75.6%

Every carrier on BOS to BUF, 1,235 flights

These figures cover 221 flights between July 2025 and June 2026. The median arrival is 18 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 BOS to BUF

Republic flew 221 of the 1,235 flights on BOS to BUF, about 18% of it. Its 83.9% on time is 8 points better than the route as a whole, which runs 75.6%. Ranked by on-time rate it is first of three carriers on the route, where the range runs from Republic at 83.9% to JetBlue at 73.1%. 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.

On-time performance by carrier on BOS to BUF
Airline	Flights	On time	Avg delay	Cancelled	Grade
Republic Airways (this page)thin sample	221	83.9%	49 min	1.36%	B
Envoy Airthin sample	67	82.1%	75 min	0.00%	B+
JetBlue Airways	947	73.1%	74 min	2.53%	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 17 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–8am—
8am–11am80 flights86.2%
11am–2pm6 flights—
2pm–5pm62 flights90.3%
5pm–8pm38 flights73.0%
8pm–5am35 flights75.8%

Scale runs 65% to 95%. Rows with fewer than 30 flights show a dash.

The best window here is not the first bank but the 2pm–5pm slot at 90.3% on time, ahead of 5pm–8pm at 73.0%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 8am–11am window is the busiest, with 80 flights scheduled in it.

Across the year

Republic on BOS to BUF through the year

Apr–Jun 2026221 flights83.9%

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 83.9% on time across 221 flights.

Split by quarter, Republic on BOS to BUF 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 83.9% annual figure is the one to use.

Across the week, Monday is the strongest day at 91.2% on time and Wednesday the weakest at 76.5%. 15 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. Late-arriving aircraft accounts for 76% of the 1,722 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.

Late-arriving aircraft
76%
Carrier
18%
National Airspace System
6%

76% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,722 reported delay minutes here, that single category outweighs weather by 76 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,722 reported delay minutes.

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

Badly late arrivals are rare here: only 4.6% land an hour or more behind schedule, against 8.1% nationally. Connections built on this flight are about as safe as US domestic connections get, though a cancelled flight still ignores every layover you give it.

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 2pm–5pm window matters as much as it does.

The return leg runs 85.3% 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 BOS to BUF

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 83.9% 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.

Where to go next

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.

Key figures