Flight number record

YX 5733

Republic Airways · New York to Boston

Route: JFK → BOS
Departs: 09:50
Flights: 364
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5733, 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 5733 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 10 points better than the national rate of 77.6%. When something does go wrong the average delay runs a little over an hour. That rests on 364 flights, with a median arrival 10 minutes early.

Set against the rest of the country, YX 5733's record is 10 points better than the US average of 77.6%. That gap is worth roughly 101 fewer late arrivals for every thousand flights.

On time

87.7%

Arrivals under 15 minutes late, of 358 completed flights

Avg delay

79 min

Across delayed arrivals only, not all flights

Cancelled

1.65%

National rate is 1.81%

1 hour+ late

5.0%

National rate is 8.1%

These figures cover 364 flights between July 2025 and June 2026. The median arrival is 10 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 5733 flies

YX 5733 flies JFK to BOS without a single fixed slot. Its most common scheduled departure was 09:50, used on 123 of 364 flights, with 10:00 (64 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 09:50123 flights33.8%
Departs 10:0064 flights17.6%

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 09:50 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and YX 5733 runs 4 points better at 87.7%. 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 5733 next to JFK to BOS

Every carrier on JFK to BOS combined arrived on time 73.7% of the time across 5,744 flights, so YX 5733 is 14 points ahead of it. Republic flew 2,916 flights on the same city pair under all its flight numbers, including this one, and those ran 77.8% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 9 points.

YX 5733 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5733thin sample	364	87.7%	79 min	1.65%	A
All Republic Airways on JFK–BOS	2,916	77.8%	74 min	4.39%	B−
All carriers on JFK–BOS	5,744	73.7%	78 min	4.18%	C−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5733 quarter by quarter

YX 5733 did not run the same all year. Its best quarter was Jul–Sep 2025 at 93.5% on time and its weakest Jan–Mar 2026 at 77.6%, a swing of 16 points on roughly 91 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 flights93.5%
Oct–Dec 202591 flights86.7%
Jan–Mar 202690 flights77.6%
Apr–Jun 202691 flights92.3%

Scale runs 70% to 100%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5733 did best on Wednesday at 94.2% on time and worst on Monday at 74.0%. Each day rests on about 52 flights, so a gap of 20 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5733 runs late

Carriers report a reason for every delay minute they cause, in five DOT categories. The split below is by minutes, not by number of flights, so a handful of very long weather delays weighs as much as many short ones. It covers 3,456 reported delay minutes.

Carrier
39%
National Airspace System
32%
Late-arriving aircraft
29%

The largest share of delay minutes, 39%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 1,362 of the 3,456 delay minutes reported here. The split is drawn from 3,456 delay minutes reported on YX 5733.

Cancellations sit at 1.65% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

5.0% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last a little over an hour, which a normal layover absorbs.

Every one of the 364 flights under YX 5733 in the data flew JFK to BOS. 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. 364 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 5733

For a booking, read YX 5733 as 87.7% on time with 1.65% cancelled over 364 flights. Those are rates from the past twelve months, not a forecast for any particular day.

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