Flight number record

YX 4586

Republic Airways · New York to Indianapolis

Route: JFK → IND
Departs: 18:51
Flights: 322
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 4586, 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 4586 sits in the middle of the pack with a C−. About seven flights in ten arrive on time by the DOT's definition, 7 points worse than the national rate of 77.6%. The late ones land an hour and a half behind schedule. That rests on 322 flights, with a median arrival 10 minutes early.

The national on-time rate over the same period is 77.6%, so YX 4586 runs 7 points behind the country as a whole. Across a thousand flights that is about 65 extra late arrivals.

On time

71.1%

Arrivals under 15 minutes late, of 301 completed flights

Avg delay

99 min

Across delayed arrivals only, not all flights

Cancelled

6.52%

National rate is 1.81%

1 hour+ late

15.0%

National rate is 8.1%

These figures cover 322 flights between July 2025 and June 2026. Beyond the headline rate, 15.0% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When YX 4586 flies

YX 4586 flies JFK to IND without a single fixed slot. Its most common scheduled departure was 18:51, used on 44 of 322 flights, with 20:30 (40 flights) and 18:01 (37 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 18:5144 flights13.7%
Departs 20:3040 flights12.4%
Departs 18:0137 flights11.5%

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 18:51 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and YX 4586 runs 3 points better at 71.1%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

YX 4586 next to JFK to IND

Every carrier on JFK to IND combined arrived on time 76.1% of the time across 1,000 flights, so YX 4586 is 5 points behind it. Across its whole network Republic Airways managed 78.5%, which this flight trails by 7 points.

YX 4586 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 4586thin sample	322	71.1%	99 min	6.52%	C−
All Republic Airways on JFK–IND	1,000	76.1%	85 min	4.60%	B−
All carriers on JFK–IND	1,000	76.1%	85 min	4.60%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 4586 quarter by quarter

YX 4586 did not run the same all year. Its best quarter was Jan–Mar 2026 at 78.0% on time and its weakest Oct–Dec 2025 at 62.4%, a swing of 16 points on roughly 81 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 202592 flights70.2%
Oct–Dec 202590 flights62.4%
Jan–Mar 202690 flights78.0%
Apr–Jun 202650 flights76.0%

Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.

By weekday, YX 4586 did best on Monday at 77.5% on time and worst on Tuesday at 62.2%. Each day rests on about 46 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 4586 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 56% of the 8,648 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
56%
Carrier
20%
National Airspace System
14%
Extreme weather
10%
Security
0%

56% 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 8,648 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 8,648 delay minutes reported on YX 4586.

Cancellations run at 6.52%, against 1.81% nationally. That is about one flight in fifteen 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 15.0% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

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.

The same number turns up on one other city pair in the data, including CHS to LGA (33), but none flew often enough under YX 4586 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to JFK to IND only.

One caution: this is a thin sample. 322 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 4586

For a booking, the cancellation rate is the figure to plan around on YX 4586: 6.52% of its 322 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.

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