Flight number record
YX 4631
Republic Airways · Indianapolis to New York
- Route
- IND → JFK
- Departs
- 07:11
- Flights
- 351
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 4631, 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 4631 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 14 points better than the national rate of 77.3%. When something does go wrong the average delay runs about an hour. That rests on 351 flights, with a median arrival 13 minutes early.
Set against the rest of the country, YX 4631's record is 14 points better than the US average of 77.3%. That gap is worth roughly 141 fewer late arrivals for every thousand flights.
Key figures
On time
91.4%
Arrivals under 15 minutes late, of 338 completed flights
Avg delay
61 min
Across delayed arrivals only, not all flights
Cancelled
2.85%
National rate is 1.89%
1 hour+ late
1.5%
National rate is 8.3%
These figures cover 351 flights between September 2025 and August 2026. The median arrival is 13 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 4631 flies
YX 4631 flies IND to JFK without a single fixed slot. Its most common scheduled departure was 07:11, used on 47 of 351 flights, with 05:08 (36 flights) next.
- Departs 07:1147 flights13.4%
- Departs 05:0836 flights10.3%
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 07:11 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 4631 runs 2 points better at 91.4%. 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 4631 next to IND to JFK
Every carrier on IND to JFK combined arrived on time 82.8% of the time across 974 flights, so YX 4631 is 9 points ahead of it. Across its whole network Republic Airways managed 78.1%, which this flight beats by 13 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 4631thin sample | 351 | 91.4% | 61 min | 2.85% | A |
| All Republic Airways on IND–JFK | 974 | 82.8% | 73 min | 3.39% | B− |
| All carriers on IND–JFK | 974 | 82.8% | 73 min | 3.39% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 4631 quarter by quarter
Quarter by quarter YX 4631 held fairly steady: 96.7% in Jul–Sep 2025, 90.7% in Oct–Dec 2025, 88.9% in Jan–Mar 2026, 90.5% in Apr–Jun 2026 and 94.7% 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 202530 flights96.7%
- Oct–Dec 202588 flights90.7%
- Jan–Mar 202686 flights88.9%
- Apr–Jun 202685 flights90.5%
- Jul–Sep 202662 flights94.7%
Scale runs 80% to 100%.
By weekday, YX 4631 ranged from 86.0% on Wednesday to 95.9% on Friday. With about 50 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 4631 runs when it is late
YX 4631 often beats the schedule: 149 of 338 completed flights, 44%, arrived 15 minutes or more early. The 29 late arrivals split 13 under half an hour, 11 between 30 and 60 minutes, and 5 an hour or more.
- 15+ min early149 flights44.1%
- Within 15 min160 flights47.3%
- 15–29 min late13 flights3.8%
- 30–59 min late11 flights3.3%
- 1–2 hours late1 flights0.3%
- 2+ hours late4 flights1.2%
Scale runs 0% to 100%.
Share of 338 completed flights by arrival against schedule.
A late pushback is often recovered here: of 33 departures that left 15 minutes late or more, 12 still arrived on time. 8 flights left on time and still arrived late.
The worst days
Worst days for YX 4631
The latest arrival of the period was on 6 May 2026, 7 hours 31 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across May, March, February and December, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 6 May 2026 | 7 hours 31 minutes | Late-arriving aircraft |
| 16 March 2026 | 3 hours 30 minutes | Late-arriving aircraft |
| 11 February 2026 | 2 hours 48 minutes | Carrier |
| 19 December 2025 | 2 hours 22 minutes | National Airspace System |
| 5 May 2026 | 1 hour 34 minutes | Carrier |
Delay causes
Why YX 4631 runs late
Late-arriving aircraft accounts for 43% of the 1,756 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 34%Carrier
- 20%National Airspace System
- 3%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,756 reported delay minutes here, that single category outweighs weather by 16 to one. The split is drawn from 1,756 delay minutes reported on YX 4631.
Cancellations run at 2.85%, against 1.89% nationally. That is roughly one flight in 40 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 1.5% 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 665 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 351 flights under YX 4631 in the data flew IND to JFK. 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. 351 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 4631
For a booking, the cancellation rate is the figure to plan around on YX 4631: 2.85% of its 351 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- IND to JFK, every carrier and departure
- JFK to IND, the return direction
- Republic Airways 4592 on the same route79.2%
- Indianapolis International (IND) delay statistics
- John F. Kennedy International (JFK) 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.