Flight profile · Republic Airways
YX4631
Indianapolis (IND) to New York (JFK) · scheduled 5:47 AM – 7:59 AM
How YX4631 performs
710 operations, November 2023 – July 2026.
YX4631 arrived on time 92.1% of the time, against 84.7% for all IND → JFK flights, so this departure is 7.4 percentage points better than the route as a whole. Against Republic Airways’ own flights on this route it is 7.5 points better.
Source: US DOT Bureau of Transportation Statistics · 710 operations, November 2023 – July 2026 · If YX4631 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where YX4631 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| YX4631 | 92.1% | 2.11% | -12 min | 1.9% | 710 |
| Republic Airways on IND → JFK | 84.6% | 2.58% | -9 min | 6.6% | 3,405 |
| All IND → JFK flights | 84.7% | 3.14% | -10 min | 6.5% | 4,877 |
YX4631 has cancelled 2.11% of its scheduled departures (15 of 710), against 3.14% for all IND → JFK flights — this specific departure cancels 1.0 percentage points less often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about YX4631 specifically, not about the route it flies.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
Why YX4631 runs late
Where US DOT attributed the delay minutes on this flight.
crew, maintenance, boarding and fueling, all within the carrier’s control
the inbound aircraft was late, so this flight started late
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for YX4631 on IND → JFK. Only delays of 15 minutes or more are attributed.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Does a late aircraft delay this flight?
How often the plane that flies YX4631 comes in late, and what that does to the departure.
YX4631 is usually the aircraft’s first flight of the day: the schedule gives it a median of 8.2 hours on the ground at IND, so its “inbound” is mostly the aircraft’s arrival the evening before.
When the aircraft came in 15 or more minutes late, YX4631 pushed back an average of 3 minutes late; when it came in on time or early, an average of 2 minutes early.
Each departure is matched to the flight the same aircraft flew into IND just before it, using the tail number in the DOT file, 576 of 696 departures in all. A departure is left out when that flight is unknown, was cancelled or diverted, or the aircraft had sat for more than 12 hours. A flight the airline cancelled never left and is not in the count, and one flown by a substitute aircraft is matched to the aircraft that flew it, not to the one first planned.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| YX4631 | 22% | 13% | 4% |
| Network, same turn | 29% | 12% | 9% |
A night on the ground absorbs most of a late arrival, so a late inbound matters far less on a turn this long than on a same-day one.
The network row is every flight with a scheduled turn of 6 hours or more, usually overnight. How often YX4631’s aircraft landed 15 or more minutes late is lower than the network’s and, once the aircraft was late, how often YX4631 left 15 or more minutes late is about the same as the network’s.
More: Which Flight Numbers Pay for a Late Aircraft lists the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
From pushback to gate
When it leaves IND late, does that still matter by the time it reaches JFK?
YX4631 pushes back an average of 0.1 minutes early and reaches the gate at JFK an average of 7.0 minutes early. The 7.0 minutes between those two figures are slack the published schedule already carries, which is why a late pushback on this flight does not reliably become a late arrival. It spends 17.4 minutes on the taxiways at IND, 2.9 minutes longer than a typical IND departure in the same hour.
On arrival at JFK, YX4631 spends 11.5 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is about what any arrival at JFK spends on the ground before reaching the gate.
Departure delay is averaged over every pushback and arrival delay over every completed arrival, so the two counts differ by the flights that never reached JFK. Taxi-out is gate to wheels up and sits inside the scheduled block rather than on top of it; the comparison is 7,307 departures from IND scheduled in the clock hour YX4631 most often leaves in. Taxi-in is landing to gate, compared against every arrival FlyerIntel has on file at JFK (351,546 flights), not just YX4631’s own. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026
The hour it leaves IND
Part of any flight’s record belongs to the clock rather than to the flight. YX4631 has one departure time, so this is what that time is worth.
On-time arrival rate. 7,307 departures from IND are scheduled in the 5 AM–6 AM hour over the period, against 147,128 across the whole day.
YX4631 is scheduled out of IND at 5:47 AM, in the 5 AM–6 AM bank. Departures from IND in that hour arrive on time 92.9% of the time against 81.9% across the airport’s whole day — the slot alone is worth 11.0 points better before anything about this particular flight is considered.
The two airport figures cover every departure from IND to every destination, so they describe the slot rather than this journey — the like-for-like comparison against the route is above. Hours are scheduled local, and a number whose schedule moved between banks inside the period has no single hour and is not described here at all. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · November 2023 – July 2026 · Hours below 120 departures are not scored.
Other routes YX4631 has flown
A flight number is a slot in a schedule, and carriers reassign it. These are the other city pairs this number served in the analysis period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DCA→MHT Washington to Manchester | November 22, 2024 – December 4, 2024 | 6 | — |
| MHT→DCA Manchester to Washington | November 22, 2024 – December 4, 2024 | 6 | — |
| BDL→DCA Hartford to Washington | November 5, 2024 – December 3, 2024 | 19 | — |
| DCA→BDL Washington to Hartford | November 5, 2024 – December 3, 2024 | 19 | — |
| GSO→LGA Greensboro to New York | July 1, 2023 – September 3, 2024 | 271 | 86.8% |
| LGA→GSO New York to Greensboro | July 3, 2023 – September 3, 2024 | 199 | 88.1% |
Because the same number has served different journeys, the statistics above describe only the route YX4631 currently operates. Blending them would produce an average of two different flights.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
11 min late
against a median of 12 min early
Percentiles over 710 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering November 2023 – July 2026
Data and methodology
Calculated by FlyerIntel from 710 records of YX4631 operating IND → JFK, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule. Cancelled and diverted flights are excluded from the on-time rate and reported separately. Flight numbers are resolved as carrier plus number plus route, because the same number serves different routes over time.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
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