Flight number record
YX 4726
Republic Airways · Indianapolis to Boston
- Route
- IND → BOS
- Departs
- 18:43
- Flights
- 265
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4726, 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 4726 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 9 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 265 flights, with a median arrival 4 minutes early.
The national on-time rate over the same period is 77.3%, so YX 4726 runs 9 points behind the country as a whole. Across a thousand flights that is about 93 extra late arrivals.
Key figures
On time
68.0%
Arrivals under 15 minutes late, of 250 completed flights
Avg delay
87 min
Across delayed arrivals only, not all flights
Cancelled
5.66%
National rate is 1.89%
1 hour+ late
16.8%
National rate is 8.3%
These figures cover 265 flights between September 2025 and August 2026. Beyond the headline rate, 16.8% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 4726 flies
YX 4726 flies IND to BOS without a single fixed slot. Its most common scheduled departure was 18:43, used on 38 of 265 flights, with 19:30 (37 flights) and 18:37 (36 flights) next.
- Departs 18:4338 flights14.3%
- Departs 19:3037 flights14.0%
- Departs 18:3736 flights13.6%
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 18:43 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and YX 4726 runs level with that at 68.0%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
YX 4726 next to IND to BOS
Every carrier on IND to BOS combined arrived on time 78.8% of the time across 2,025 flights, so YX 4726 is 11 points behind it. Republic flew 1,975 flights on the same city pair under all its flight numbers, including this one, and those ran 78.9% on time. Across its whole network Republic Airways managed 78.1%, which this flight trails by 10 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4726thin sample | 265 | 68.0% | 87 min | 5.66% | C− |
| All Republic Airways on IND–BOS | 1,975 | 78.9% | 71 min | 2.78% | B |
| All carriers on IND–BOS | 2,025 | 78.8% | 71 min | 2.77% | B |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4726 quarter by quarter
YX 4726 did not run the same all year. Its best quarter was Jan–Mar 2026 at 74.2% on time and its weakest Jul–Sep 2026 at 58.7%, a swing of 16 points on roughly 66 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 20252 flights—
- Oct–Dec 202562 flights65.0%
- Jan–Mar 202672 flights74.2%
- Apr–Jun 202677 flights71.1%
- Jul–Sep 202652 flights58.7%
Scale runs 50% to 80%. Rows with fewer than 30 flights show a dash.
By weekday, YX 4726 ranged from 63.4% on Monday to 72.5% on Sunday. With about 38 flights behind each day, a spread of 9 points is inside normal variation, so the day you fly is not worth changing for this flight.
Arrival by arrival
How late YX 4726 runs when it is late
YX 4726 often beats the schedule: 81 of 250 completed flights, 32%, arrived 15 minutes or more early. When YX 4726 is late it tends to be very late: 42 of its 80 late arrivals were an hour or more behind, and 15 were two hours or more.
- 15+ min early81 flights32.4%
- Within 15 min89 flights35.6%
- 15–29 min late15 flights6.0%
- 30–59 min late23 flights9.2%
- 1–2 hours late27 flights10.8%
- 2+ hours late15 flights6.0%
Scale runs 0% to 100%.
Share of 250 completed flights by arrival against schedule.
14 of 89 late departures made up the time and arrived on time, 16% of them. 5 flights left on time and still arrived late.
The worst days
Worst days for YX 4726
The latest arrival of the period was on 10 February 2026, 10 hours 2 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 10 February 2026 | 10 hours 2 minutes | Carrier |
| 27 August 2026 | 8 hours 9 minutes | Late-arriving aircraft |
| 7 August 2026 | 4 hours 24 minutes | Extreme weather |
| 6 November 2025 | 3 hours 46 minutes | Late-arriving aircraft |
| 5 December 2025 | 3 hours 15 minutes | Late-arriving aircraft |
Delay causes
Why YX 4726 runs late
Late-arriving aircraft accounts for 51% of the 6,933 delay minutes carriers reported here, and the remaining four split what is left.
- 51%Late-arriving aircraft
- 32%National Airspace System
- 14%Carrier
- 3%Extreme weather
51% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 6,933 reported delay minutes here, that single category outweighs weather by 19 to one. The split is drawn from 6,933 delay minutes reported on YX 4726.
Cancellations run at 5.66%, against 1.89% nationally. That is roughly one flight in twenty 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
16.8% 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 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 three other city pairs in the data, including BOS to IND (63), BUF to DCA (16) and DCA to ROC (5), but none flew often enough under YX 4726 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to IND to BOS only.
One caution: this is a thin sample. 265 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 4726
For a booking, the cancellation rate is the figure to plan around on YX 4726: 5.66% of its 265 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- IND to BOS, every carrier and departure
- BOS to IND, the return direction
- Republic Airways 5631 on the same route93.6%
- Republic Airways 4716 on the same route88.2%
- Indianapolis International (IND) 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
- Why the first flight of the morning is statistically safest
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.