Flight number record
YX 4642
Republic Airways · Columbus to Boston
- Route
- CMH → BOS
- Departs
- 08:00
- Flights
- 358
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4642, 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 4642 earns an A. Nearly every flight arrives inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 17 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 358 flights, with a median arrival 15 minutes early.
Set against the rest of the country, YX 4642's record is 17 points better than the US average of 77.3%. That gap is worth roughly 170 fewer late arrivals for every thousand flights.
Key figures
On time
94.3%
Arrivals under 15 minutes late, of 353 completed flights
Avg delay
65 min
Across delayed arrivals only, not all flights
Cancelled
1.12%
National rate is 1.89%
1 hour+ late
2.3%
National rate is 8.3%
These figures cover 358 flights between September 2025 and August 2026. The median arrival is 15 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 4642 flies
YX 4642 flies CMH to BOS without a single fixed slot. Its most common scheduled departure was 08:00, used on 95 of 358 flights, with 07:15 (38 flights) next.
- Departs 08:0095 flights26.5%
- Departs 07:1538 flights10.6%
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 08:00 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 83.9%, and YX 4642 runs 10 points better at 94.3%. 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 4642 next to CMH to BOS
Every carrier on CMH to BOS combined arrived on time 82.5% of the time across 2,005 flights, so YX 4642 is 12 points ahead of it. Republic flew 1,888 flights on the same city pair under all its flight numbers, including this one, and those ran 83.6% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4642thin sample | 358 | 94.3% | 65 min | 1.12% | A |
| All Republic Airways on CMH–BOS | 1,888 | 83.6% | 61 min | 2.44% | B |
| All carriers on CMH–BOS | 2,005 | 82.5% | 64 min | 2.29% | B |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4642 quarter by quarter
Quarter by quarter YX 4642 held fairly steady: 93.3% in Jul–Sep 2025, 92.2% in Oct–Dec 2025, 92.6% in Jan–Mar 2026, 95.6% in Apr–Jun 2026 and 98.4% in Jul–Sep 2026. A spread of 6 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights93.3%
- Oct–Dec 202591 flights92.2%
- Jan–Mar 202685 flights92.6%
- Apr–Jun 202690 flights95.6%
- Jul–Sep 202662 flights98.4%
Scale runs 85% to 100%.
By weekday, YX 4642 ranged from 90.2% on Monday to 98.1% on Friday. With about 51 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 4642 runs when it is late
YX 4642 often beats the schedule: 177 of 353 completed flights, 50%, arrived 15 minutes or more early. The 20 late arrivals split 8 under half an hour, 4 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early177 flights50.1%
- Within 15 min156 flights44.2%
- 15–29 min late8 flights2.3%
- 30–59 min late4 flights1.1%
- 1–2 hours late5 flights1.4%
- 2+ hours late3 flights0.8%
Scale runs 0% to 100%.
Share of 353 completed flights by arrival against schedule.
A late pushback is often recovered here: of 21 departures that left 15 minutes late or more, 8 still arrived on time. Only 7 left on time and still arrived late.
The worst days
Worst days for YX 4642
The latest arrival of the period was on 19 January 2026, 3 hours 55 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across January, December, March and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 January 2026 | 3 hours 55 minutes | Late-arriving aircraft |
| 31 December 2025 | 2 hours 33 minutes | Extreme weather |
| 13 March 2026 | 2 hours 23 minutes | Carrier |
| 2 March 2026 | 1 hour 42 minutes | National Airspace System |
| 1 August 2026 | 1 hour 39 minutes | National Airspace System |
Delay causes
Why YX 4642 runs late
Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 1,292 reported delay minutes.
- 33%National Airspace System
- 25%Late-arriving aircraft
- 22%Carrier
- 20%Extreme weather
Extreme weather accounts for 20% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 3.4 times the usual weather exposure. The split is drawn from 1,292 delay minutes reported on YX 4642.
Cancellations sit at 1.12% against a national 1.89%, which is ordinary. Diversions add another 0.28%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 2.3% 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 640 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.
Every one of the 358 flights under YX 4642 in the data flew CMH to BOS. The number was not reused on any other city pair, which makes this a clean record of one route.
One caution: this is a thin sample. 358 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 YX 4642
For a booking, YX 4642 has one of the better records a US domestic flight can show: 94.3% on time and 1.12% cancelled. That is a base rate, not a promise about any single day.
Related
Where to go next
- CMH to BOS, every carrier and departure
- BOS to CMH, the return direction
- Republic Airways 5663 on the same route92.7%
- John Glenn Columbus International (CMH) delay statistics
- Boston Logan International (BOS) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- Worst months to fly in the US, ranked by the data
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 ; recomputed monthly. How this data is collected.