Flight number record

YX 5601

Republic Airways · Boston to Cincinnati

Route: BOS → CVG
Departs: 08:45
Flights: 352
Period: September 2025 to August 2026

Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5601, check with Republic Airways. Republic Airways flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.

YX 5601 earns an A−. Close to nine flights in ten arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 10 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 40 minutes. That rests on 352 flights, with a median arrival 12 minutes early.

Set against the rest of the country, YX 5601's record is 10 points better than the US average of 77.3%. That gap is worth roughly 103 fewer late arrivals for every thousand flights.

On time

87.6%

Arrivals under 15 minutes late, of 339 completed flights

Avg delay

40 min

Across delayed arrivals only, not all flights

Cancelled

3.69%

National rate is 1.89%

1 hour+ late

2.1%

National rate is 8.3%

These figures cover 352 flights between September 2025 and August 2026. The median arrival is 12 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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Schedule

When YX 5601 flies

YX 5601 flies BOS to CVG without a single fixed slot. Its most common scheduled departure was 08:45, used on 194 of 352 flights, with 08:22 (36 flights) next.

Departs 08:45194 flights55.1%
Departs 08:2236 flights10.2%

Scale runs 0% to 100%.

Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.

A 08:45 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and YX 5601 runs 4 points better at 87.6%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

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Against the route

YX 5601 next to BOS to CVG

Every carrier on BOS to CVG combined arrived on time 78.9% of the time across 2,060 flights, so YX 5601 is 9 points ahead of it. Republic flew 1,673 flights on the same city pair under all its flight numbers, including this one, and those ran 80.7% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 10 points.

YX 5601 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5601thin sample	352	87.6%	40 min	3.69%	A−
All Republic Airways on BOS–CVG	1,673	80.7%	56 min	3.17%	B−
All carriers on BOS–CVG	2,060	78.9%	64 min	2.91%	B
Republic Airways, whole network	364,452	78.1%	74 min	4.55%	B−

Across the year

YX 5601 quarter by quarter

Quarter by quarter YX 5601 held fairly steady: 85.5% in Oct–Dec 2025, 83.1% in Jan–Mar 2026, 91.0% in Apr–Jun 2026 and 88.3% in Jul–Sep 2026. A spread of 8 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202525 flights—
Oct–Dec 202585 flights85.5%
Jan–Mar 202690 flights83.1%
Apr–Jun 202690 flights91.0%
Jul–Sep 202662 flights88.3%

Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5601 ranged from 84.6% on Saturday to 92.2% on Wednesday. With about 50 flights behind each day, a spread of 8 points is inside normal variation, so the day you fly is not worth changing for this flight.

Arrival by arrival

How late YX 5601 runs when it is late

YX 5601 often beats the schedule: 149 of 339 completed flights, 44%, arrived 15 minutes or more early. The 42 late arrivals split 18 under half an hour, 17 between 30 and 60 minutes, and 7 an hour or more. Not one arrived two hours late.

15+ min early149 flights44.0%
Within 15 min148 flights43.7%
15–29 min late18 flights5.3%
30–59 min late17 flights5.0%
1–2 hours late7 flights2.1%
2+ hours late0 flights0.0%

Scale runs 0% to 100%.

Share of 339 completed flights by arrival against schedule.

8 of 34 late departures made up the time and arrived on time, 24% of them. 16 flights left on time and still arrived late.

The worst days

Worst days for YX 5601

The latest arrival of the period was on 19 January 2026, 1 hour 49 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. The same cause led on four of the five worst days.

The latest arrivals of YX 5601 in the period
Date	Arrived late by	Largest filed cause
19 January 2026	1 hour 49 minutes	National Airspace System
20 July 2026	1 hour 27 minutes	Carrier
21 February 2026	1 hour 23 minutes	National Airspace System
23 March 2026	1 hour 16 minutes	National Airspace System
27 December 2025	1 hour 14 minutes	National Airspace System

Delay causes

Why YX 5601 runs late

Carrier accounts for 46% of the 1,675 delay minutes carriers reported here, and the remaining four split what is left.

Carrier
46%
National Airspace System
40%
Late-arriving aircraft
13%
Extreme weather
1%

The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 763 of the 1,675 delay minutes reported here. The split is drawn from 1,675 delay minutes reported on YX 5601.

Cancellations run at 3.69%, against 1.89% nationally. That is roughly one flight in 25 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 routes

What a delay on this flight costs

Badly late arrivals are rare here: only 2.1% land an hour or more behind schedule, against 8.3% 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.

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.

YX 5601 is not only a BOS to CVG flight. It also flew CVG to BOS (327 flights, 82.5% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 352 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.

Other routes flown as YX 5601
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
CVG to BOSthin sample	327	82.5%	53 min	3.67%	B−

What to do with this

Booking YX 5601

For a booking, the cancellation rate is the figure to plan around on YX 5601: 3.69% of its 352 scheduled flights did not operate. A late arrival costs about 40 minutes, but a cancellation costs the day, so leave a later option open.

Where to go next

A flight number here means Republic Airways’s own number as it reports to the DOT. How the figures are computed is on the methodology page.

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures