Flight number record

YX 4631

Republic Airways · Indianapolis to New York

Route: IND → JFK
Departs: 07:11
Flights: 351
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 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 77.6%. 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 77.6%. That gap is worth roughly 142 fewer late arrivals for every thousand flights.

On time

91.8%

Arrivals under 15 minutes late, of 342 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

2.56%

National rate is 1.81%

1 hour+ late

1.5%

National rate is 8.1%

These figures cover 351 flights between July 2025 and June 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.

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 41 of 351 flights, with 07:48 (37 flights) and 05:08 (36 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 07:1141 flights11.7%
Departs 07:4837 flights10.5%
Departs 05:0836 flights10.3%

Scale runs 0% to 100%. Rows with fewer than 30 flights show a dash.

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 3 points better at 91.8%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.

Against the route

YX 4631 next to IND to JFK

Every carrier on IND to JFK combined arrived on time 83.1% of the time across 1,002 flights, so YX 4631 is 9 points ahead of it. Across its whole network Republic Airways managed 78.5%, which this flight beats by 13 points.

YX 4631 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4631thin sample	351	91.8%	63 min	2.56%	A
All Republic Airways on IND–JFK	1,002	83.1%	78 min	2.59%	B
All carriers on IND–JFK	1,002	83.1%	78 min	2.59%	B
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	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 and 90.5% in Apr–Jun 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 202592 flights96.7%
Oct–Dec 202588 flights90.7%
Jan–Mar 202686 flights88.9%
Apr–Jun 202685 flights90.5%

Scale runs 80% to 100%. Rows with fewer than 30 flights show a dash.

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.

Delay causes

Why YX 4631 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 43% of the 1,771 delay minutes carriers reported, and the remaining four split what is left. The split is by minutes rather than by flights, so a few very long delays count for as much as many short ones.

Late-arriving aircraft
43%
Carrier
31%
National Airspace System
18%
Extreme weather
7%

43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 1,771 reported delay minutes here, that single category outweighs weather by 6 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 1,771 delay minutes reported on YX 4631.

Cancellations run at 2.56%, against 1.81% nationally. That is about 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 8.1% 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. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.

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: 2.56% 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.

Where to go next

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, July 2025 to June 2026. Last updated 15 September 2026; recomputed monthly. How this data is collected.

Key figures