Flight number record

YX 5855

Republic Airways · Boston to New York

Route: BOS → LGA
Departs: 20:00
Flights: 251
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5855, 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 5855 draws a D−. Roughly one flight in two 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 251 flights, with a median arrival 4 minutes late.

The national on-time rate over the same period is 77.6%, so YX 5855 runs 19 points behind the country as a whole. Across a thousand flights that is about 186 extra late arrivals.

On time

59.0%

Arrivals under 15 minutes late, of 227 completed flights

Avg delay

76 min

Across delayed arrivals only, not all flights

Cancelled

9.56%

National rate is 1.81%

1 hour+ late

20.3%

National rate is 8.1%

These figures cover 251 flights between July 2025 and June 2026. Beyond the headline rate, 20.3% 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 5855 flies

YX 5855 is scheduled to leave Boston (BOS) at 20:00 local time and reach New York (LGA) at 21:29. That slot held for 245 of the 251 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.

Departs 20:00245 flights97.6%

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 20:00 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and YX 5855 runs 12 points worse at 59.0%. 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 5855 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 5855 is 19 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 20 points.

YX 5855 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5855thin sample	251	59.0%	76 min	9.56%	D−
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 5855 quarter by quarter

Quarter by quarter YX 5855 held fairly steady: 60.6% in Jul–Sep 2025, 60.0% in Oct–Dec 2025, 56.9% in Jan–Mar 2026 and 58.1% in Apr–Jun 2026. A spread of 4 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202579 flights60.6%
Oct–Dec 202567 flights60.0%
Jan–Mar 202674 flights56.9%
Apr–Jun 202631 flights58.1%

Scale runs 50% to 65%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5855 did best on Wednesday at 68.4% on time and worst on Sunday at 48.6%. Each day rests on about 36 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5855 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 49% of the 7,031 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
49%
National Airspace System
29%
Carrier
22%
Extreme weather
0%

49% 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 7,031 reported delay minutes here, that single category outweighs weather by 49 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 7,031 delay minutes reported on YX 5855.

Cancellations run at 9.56%, 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. 20.3% 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 three other city pairs in the data, including PIT to DTW (31), CMH to DTW (3) and JFK to IND (1), but none flew often enough under YX 5855 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. 251 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 5855

For a booking, the cancellation rate is the figure to plan around on YX 5855: 9.56% of its 251 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