Flight number record
YX 5663
Republic Airways · Columbus to Boston
- Route
- CMH → BOS
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5663, 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 5663 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 15 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 40 minutes. That rests on 365 flights, with a median arrival 18 minutes early.
Set against the rest of the country, YX 5663's record is 15 points better than the US average of 77.3%. That gap is worth roughly 154 fewer late arrivals for every thousand flights.
Key figures
On time
92.7%
Arrivals under 15 minutes late, of 357 completed flights
Avg delay
42 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
1.4%
National rate is 8.3%
These figures cover 365 flights between September 2025 and August 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.
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Schedule
When YX 5663 flies
YX 5663 flies CMH to BOS without a single fixed slot. Its most common scheduled departure was 06:00, used on 85 of 365 flights, with 07:05 (83 flights) and 07:00 (39 flights) next.
- Departs 06:0085 flights23.3%
- Departs 07:0583 flights22.7%
- Departs 07:0039 flights10.7%
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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 5663 runs 3 points better at 92.7%. 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 5663 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 5663 is 10 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 15 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5663 | 365 | 92.7% | 42 min | 1.92% | 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 5663 quarter by quarter
YX 5663 did not run the same all year. Its best quarter was Jul–Sep 2025 at 100.0% on time and its weakest Jan–Mar 2026 at 82.6%, a swing of 17 points on roughly 73 flights a quarter. The twelve-month rate averages over that, so if you are flying in a weak quarter the quarter's own figure is the better guide.
- Jul–Sep 202530 flights100.0%
- Oct–Dec 202592 flights91.2%
- Jan–Mar 202690 flights82.6%
- Apr–Jun 202691 flights97.8%
- Jul–Sep 202662 flights98.3%
Scale runs 75% to 100%.
By weekday, YX 5663 ranged from 88.2% on Saturday to 98.0% on Sunday. With about 52 flights behind each day, a spread of 10 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late YX 5663 runs when it is late
YX 5663 often beats the schedule: 217 of 357 completed flights, 61%, arrived 15 minutes or more early. Most of the lateness is short. 15 of the 26 late arrivals were under half an hour behind, and 5 reached an hour or more.
- 15+ min early217 flights60.8%
- Within 15 min114 flights31.9%
- 15–29 min late15 flights4.2%
- 30–59 min late6 flights1.7%
- 1–2 hours late3 flights0.8%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 357 completed flights by arrival against schedule.
Only 15 of 357 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for YX 5663
The latest arrival of the period was on 5 May 2026, 2 hours 9 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 January 2026.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 May 2026 | 2 hours 9 minutes | Carrier |
| 28 January 2026 | 2 hours 5 minutes | Carrier |
| 19 January 2026 | 1 hour 58 minutes | National Airspace System |
| 1 October 2025 | 1 hour 23 minutes | Carrier |
| 27 January 2026 | 1 hour 23 minutes | National Airspace System |
Delay causes
Why YX 5663 runs late
National Airspace System accounts for 52% of the 1,092 delay minutes carriers reported here, and the remaining four split what is left.
- 52%National Airspace System
- 46%Carrier
- 2%Extreme weather
The largest share of delay minutes, 46%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 506 of the 1,092 delay minutes reported here. The split is drawn from 1,092 delay minutes reported on YX 5663.
Cancellations sit at 1.92% against a national 1.89%, which is ordinary. Diversions add another 0.27%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 1.4% 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 365 flights under YX 5663 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. 365 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 5663
For a booking, read YX 5663 as 92.7% on time with 1.92% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- CMH to BOS, every carrier and departure
- BOS to CMH, the return direction
- Republic Airways 4642 on the same route94.3%
- 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.