Route reliability record
CVG→BOS
Cincinnati to Boston
- Flights
- 2,059
- Period
- September 2025 to August 2026
- Distance
- 752 mi
- Carriers
- 3
This route lands a B−, 2 points better than the national rate of 77.3%. About one flight in five arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 2,059 CVG to BOS flights, of which Envoy Air flew 369 at 92.1% on time.
Best time to fly CVG to BOS: a 5am–8am departure, ideally on a Saturday. Flights in that window arrived on time 92.0% of the time and Saturday flights 86.8%, against 79.5% for the route overall.
The US average over the same twelve months is 77.3%, so there is little to separate this route from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
79.5%
Arrivals under 15 minutes late, of 1,994 completed flights
Avg delay
68 min
Across delayed arrivals only, not all flights
Cancelled
3.16%
National rate is 1.89%
Best carrier
Envoy
92.1% on time across 369 flights
These figures cover 2,059 flights between September 2025 and August 2026. Beyond the headline rate, 9.4% 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 CVG to BOS
The choice of carrier is not cosmetic here. Envoy Air arrives on time 92.1% of the time; Republic Airways manages 77.0%. Sample sizes sit next to every figure, because a two-point gap across 1,673 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Envoy Air | 369 | 92.1% | 68 min | 0.81% | A+ |
| Republic Airways | 1,673 | 77.0% | 68 min | 3.71% | B− |
| Delta Air Linesthin sample | 17 | 47.1% | 63 min | 0.00% | F+ |
Republic Airways cancels 3.7% 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 CVG to BOS
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 Cincinnati to Boston
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. CVG → BOSCincinnati to Boston | Envoy Air | 91.4% | 92.1% | 0.81% | 5am–8am, Sun | — |
| 2. CVG → BOSCincinnati to Boston | Republic Airways | 74.1% | 77.0% | 3.71% | 5am–8am, Sat | YX 5601 11:52 |
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 27 points, against 15 points between the best and worst carrier.
- 5am–8am702 flights92.0%
- 8am–11am24 flights—
- 11am–2pm361 flights82.1%
- 2pm–5pm422 flights65.9%
- 5pm–8pm311 flights64.6%
- 8pm–5am239 flights80.2%
Scale runs 55% to 95%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 64.6% 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 5am–8am window is the busiest, with 702 flights scheduled in it.
Explore
Filter CVG to BOS 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 CVG to BOS, the best departure window is 5am–8am at 92.0% on time and the worst is 5pm–8pm at 64.6%, a wide gap of 27.4 points. All US flights leaving 5am–8am ran 89.3%.
- 5–8am92.0%
- 8–11am—
- 11am–2pm82.1%
- 2–5pm65.9%
- 5–8pm64.6%
- 8pm–5am80.2%
best all US flightsScale 55% to 95%. Cells under 30 flights show a dash.
Across the year
When delays peak on this route
This route's year swings by 25 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.
Delays peak in October, when the on-time rate falls to 62.0%. January is the strongest month at 87.2%. Moving a flexible trip across that boundary buys 25 points. August was the busiest month here, with 200 flights.
Across the week, Saturday is the strongest day at 86.8% on time and Thursday the weakest at 75.1%, a spread of 12 points.
Delay causes
Why this route gets delayed
National Airspace System accounts for 56% of the 28,000 delay minutes carriers reported here, and the remaining four split what is left.
- 56%National Airspace System
- 22%Late-arriving aircraft
- 19%Carrier
- 3%Extreme weather
- 0%Security
56% 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 15,000 minutes out of 28,000, against a national NAS share of 21%. The split is drawn from 27,552 reported delay minutes.
Cancellations run at 3.16%, 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
9.4% 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.
The 752 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty.
The return leg runs 78.9% on time across 2,060 flights, within half a point 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 2,059 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 BOS after this flight
What to do with this
Booking this route
Put together: the delay figures matter less here than the 3.16% cancellation rate. A late arrival costs you about 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. 1,994 completed flights over 12 months sit behind that.
Common questions
CVG to BOS questions
How often is CVG to BOS delayed?
About one flight in five arrives at least 15 minutes late, which is the Department of Transportation's definition of a delayed arrival. That works out to 20.5% of the 2,059 flights in this analysis, against 22.7% nationally. Delayed flights are late by about an hour on average.
Which airline is most reliable on CVG to BOS?
Envoy Air leads at 92.1% on time across 369 flights. Republic Airways is at the other end on 77.0%, 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 CVG to BOS?
The 5am–8am departure window is the strongest at 92.0% on time. The 5pm–8pm window is the weakest at 64.6%, 27 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 October delays on CVG to BOS?
October is the weakest month at 62.0% on time, compared with 87.2% in January. Across the year that is 25 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
- BOS to CVG — the return legseparate record
- Cincinnati/Northern Kentucky International (CVG) delay statistics
- Boston Logan International (BOS) delay statistics
- Envoy Air on CVG to BOS92.1%
- Republic Airways on CVG to BOS77.0%
- CVG to ORD, a related route70.8%
- DCA to BOS, a related route70.1%
- CVG to ATL, a related route85.4%
- Envoy Air on-time record92.1%
- Republic Airways on-time record77.0%
- Delta Air Lines on-time record47.1%
- The US routes with the most cancellations
- Same route, different airline: where the carrier you pick matters most
Direction matters. CVG to BOS and BOS to CVG 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.