Flight number record

YX 5831

Republic Airways · Boston to New York

Route: BOS → LGA
Departs: 18:00
Flights: 298
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5831, 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 5831 draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 298 flights, with a median arrival 5 minutes early.

The national on-time rate over the same period is 77.6%, so YX 5831 runs 12 points behind the country as a whole. Across a thousand flights that is about 119 extra late arrivals.

On time

65.7%

Arrivals under 15 minutes late, of 268 completed flights

Avg delay

82 min

Across delayed arrivals only, not all flights

Cancelled

10.07%

National rate is 1.81%

1 hour+ late

18.3%

National rate is 8.1%

These figures cover 298 flights between July 2025 and June 2026. Beyond the headline rate, 18.3% 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 5831 flies

YX 5831 is scheduled to leave Boston (BOS) at 18:00 local time and reach New York (LGA) at 19:36. That slot held for 298 of the 298 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 18:00298 flights100.0%

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 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.2%, and YX 5831 runs 3 points worse at 65.7%. 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 5831 next to BOS to LGA

Every carrier on BOS to LGA combined arrived on time 77.7% of the time across 7,251 flights, so YX 5831 is 12 points behind it. Republic flew 6,708 flights on the same city pair under all its flight numbers, including this one, and those ran 76.6% on time. Across its whole network Republic Airways managed 78.5%, which this flight trails by 13 points.

YX 5831 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5831thin sample	298	65.7%	82 min	10.07%	C−
All Republic Airways on BOS–LGA	6,708	76.6%	75 min	5.81%	B−
All carriers on BOS–LGA	7,251	77.7%	77 min	5.70%	B−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5831 quarter by quarter

Quarter by quarter YX 5831 held fairly steady: 64.2% in Jul–Sep 2025, 61.3% in Oct–Dec 2025, 66.7% in Jan–Mar 2026 and 69.9% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202579 flights64.2%
Oct–Dec 202567 flights61.3%
Jan–Mar 202674 flights66.7%
Apr–Jun 202678 flights69.9%

Scale runs 55% to 75%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5831 did best on Wednesday at 70.5% on time and worst on Thursday at 58.1%. Each day rests on about 43 flights, so a gap of 12 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5831 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 45% of the 7,501 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
45%
National Airspace System
38%
Carrier
15%
Extreme weather
2%

45% 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 7,501 reported delay minutes here, that single category outweighs weather by 28 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 7,501 delay minutes reported on YX 5831.

Cancellations run at 10.07%, against 1.81% nationally. That is about one flight in ten 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. 18.3% 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 same number turns up on one other city pair in the data, including CVG to BOS (9), but none flew often enough under YX 5831 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to LGA only.

One caution: this is a thin sample. 298 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 5831

For a booking, the cancellation rate is the figure to plan around on YX 5831: 10.07% of its 298 scheduled flights did not operate. A late arrival costs a little over 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