Flight number record

YX 5740

Republic Airways · Philadelphia to Boston

Route: PHL → BOS
Departs: 06:00
Flights: 361
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5740, 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 5740 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 15 points better than the national rate of 77.6%. When something does go wrong the average delay runs about an hour. That rests on 361 flights, with a median arrival 14 minutes early.

Set against the rest of the country, YX 5740's record is 15 points better than the US average of 77.6%. That gap is worth roughly 151 fewer late arrivals for every thousand flights.

On time

92.7%

Arrivals under 15 minutes late, of 354 completed flights

Avg delay

65 min

Across delayed arrivals only, not all flights

Cancelled

1.94%

National rate is 1.81%

1 hour+ late

1.7%

National rate is 8.1%

These figures cover 361 flights between July 2025 and June 2026. The median arrival is 14 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 5740 flies

YX 5740 flies PHL to BOS without a single fixed slot. Its most common scheduled departure was 06:00, used on 272 of 361 flights, with 06:02 (59 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 06:00272 flights75.3%
Departs 06:0259 flights16.3%

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 06:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 5740 runs 3 points better at 92.7%. 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 5740 next to PHL to BOS

Every carrier on PHL to BOS combined arrived on time 75.2% of the time across 4,956 flights, so YX 5740 is 18 points ahead of it. Republic flew 1,761 flights on the same city pair under all its flight numbers, including this one, and those ran 80.9% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 14 points.

YX 5740 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5740thin sample	361	92.7%	65 min	1.94%	A
All Republic Airways on PHL–BOS	1,761	80.9%	79 min	3.18%	B−
All carriers on PHL–BOS	4,956	75.2%	79 min	2.93%	B
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5740 quarter by quarter

YX 5740 did not run the same all year. Its best quarter was Jul–Sep 2025 at 97.7% on time and its weakest Jan–Mar 2026 at 87.1%, a swing of 11 points on roughly 90 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 202588 flights97.7%
Oct–Dec 202592 flights90.1%
Jan–Mar 202690 flights87.1%
Apr–Jun 202691 flights95.6%

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

By weekday, YX 5740 ranged from 86.3% on Sunday to 98.0% on Thursday. With about 52 flights behind each day, a spread of 12 points is inside normal variation, so the day you fly is not worth changing for this flight.

Delay causes

Why YX 5740 runs late

One category carries most of the weight here. Carrier accounts for 65% of the 1,679 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.

Carrier
65%
National Airspace System
25%
Extreme weather
10%

The largest share of delay minutes, 65%, 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 1,090 of the 1,679 delay minutes reported here. The split is drawn from 1,679 delay minutes reported on YX 5740.

Cancellations sit at 1.94% against a national 1.81%, which is ordinary. Diversions add another 0.00%.

Connections and routes

What a delay on this flight costs

Badly late arrivals are rare here: only 1.7% 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.

Every one of the 361 flights under YX 5740 in the data flew PHL 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. 361 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 5740

For a booking, read YX 5740 as 92.7% on time with 1.94% cancelled over 361 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