Flight number record
YX 4725
Republic Airways · Boston to Indianapolis
- Route
- BOS → IND
- Departs
- 07:00
- Flights
- 256
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4725, 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 4725 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 11 points better than the national rate of 77.3%. When something does go wrong the average delay runs roughly 55 minutes. That rests on 256 flights, with a median arrival 15 minutes early.
Set against the rest of the country, YX 4725's record is 11 points better than the US average of 77.3%. That gap is worth roughly 111 fewer late arrivals for every thousand flights.
Key figures
On time
88.4%
Arrivals under 15 minutes late, of 251 completed flights
Avg delay
53 min
Across delayed arrivals only, not all flights
Cancelled
1.95%
National rate is 1.89%
1 hour+ late
3.6%
National rate is 8.3%
These figures cover 256 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 4725 flies
YX 4725 flies BOS to IND without a single fixed slot. Its most common scheduled departure was 07:00, used on 141 of 256 flights, with 08:25 (54 flights) and 07:30 (30 flights) next.
- Departs 07:00141 flights55.1%
- Departs 08:2554 flights21.1%
- Departs 07:3030 flights11.7%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 4725 runs level with that at 88.4%. 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 4725 next to BOS to IND
Every carrier on BOS to IND combined arrived on time 80.3% of the time across 2,025 flights, so YX 4725 is 8 points ahead of it. Republic flew 1,975 flights on the same city pair under all its flight numbers, including this one, and those ran 80.5% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4725thin sample | 256 | 88.4% | 53 min | 1.95% | A |
| All Republic Airways on BOS–IND | 1,975 | 80.5% | 69 min | 2.43% | B |
| All carriers on BOS–IND | 2,025 | 80.3% | 69 min | 2.42% | B |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4725 quarter by quarter
Quarter by quarter YX 4725 held fairly steady: 83.3% in Jul–Sep 2025, 92.1% in Oct–Dec 2025, 85.4% in Jan–Mar 2026 and 90.0% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.
- Jul–Sep 202530 flights83.3%
- Oct–Dec 202589 flights92.1%
- Jan–Mar 202687 flights85.4%
- Apr–Jun 202650 flights90.0%
Scale runs 75% to 100%.
By weekday, YX 4725 did best on Friday at 94.6% on time and worst on Monday at 75.0%. Each day rests on about 37 flights, so a gap of 20 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 4725 runs when it is late
YX 4725 often beats the schedule: 127 of 251 completed flights, 51%, arrived 15 minutes or more early. The 29 late arrivals split 14 under half an hour, 6 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early127 flights50.6%
- Within 15 min95 flights37.8%
- 15–29 min late14 flights5.6%
- 30–59 min late6 flights2.4%
- 1–2 hours late4 flights1.6%
- 2+ hours late5 flights2.0%
Scale runs 0% to 100%.
Share of 251 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 21 departures that left 15 minutes late or more, only 2 made it up before arrival. 10 flights left on time and still arrived late.
The worst days
Worst days for YX 4725
The latest arrival of the period was on 7 September 2025, 3 hours 21 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 7 September 2025 | 3 hours 21 minutes | Carrier |
| 15 September 2025 | 2 hours 25 minutes | Carrier |
| 4 April 2026 | 2 hours 16 minutes | Carrier |
| 16 April 2026 | 2 hours 13 minutes | Late-arriving aircraft |
| 16 March 2026 | 2 hours | Late-arriving aircraft |
Delay causes
Why YX 4725 runs late
Carrier accounts for 57% of the 1,534 delay minutes carriers reported here, and the remaining four split what is left.
- 57%Carrier
- 27%Late-arriving aircraft
- 16%National Airspace System
The largest share of delay minutes, 57%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 875 of the 1,534 delay minutes reported here. The split is drawn from 1,534 delay minutes reported on YX 4725.
Cancellations sit at 1.95% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and routes
What a delay on this flight costs
Badly late arrivals are rare here: only 3.6% 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 818 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 same number turns up on seven other city pairs in the data, including JFK to ORD (27), MIA to EYW (6) and EYW to MIA (6), but none flew often enough under YX 4725 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to IND only.
One caution: this is a thin sample. 256 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 4725
For a booking, read YX 4725 as 88.4% on time with 1.95% cancelled over 256 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- BOS to IND, every carrier and departure
- IND to BOS, the return direction
- Republic Airways 5616 on the same route75.6%
- Republic Airways 5627 on the same route82.0%
- Republic Airways 4585 on the same route64.2%
- Boston Logan International (BOS) delay statistics
- Indianapolis International (IND) 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
- The best time of day to fly, according to 7.05 million flight records
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.