Flight number record

YX 5845

Republic Airways · Boston to Philadelphia

Route: BOS → PHL
Departs: 08:15
Flights: 331
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5845, 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 5845 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 about 45 minutes. That rests on 331 flights, with a median arrival 13 minutes early.

Set against the rest of the country, YX 5845'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 324 completed flights

Avg delay

45 min

Across delayed arrivals only, not all flights

Cancelled

2.11%

National rate is 1.81%

1 hour+ late

2.2%

National rate is 8.1%

These figures cover 331 flights between July 2025 and June 2026. The median arrival is 13 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 5845 flies

YX 5845 flies BOS to PHL without a single fixed slot. Its most common scheduled departure was 08:15, used on 37 of 331 flights. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 08:1537 flights11.2%

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 08:15 departure sits in the 8am–11am window. Across every US flight scheduled in that window the on-time rate is 84.1%, and YX 5845 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 5845 next to BOS to PHL

Every carrier on BOS to PHL combined arrived on time 76.5% of the time across 4,961 flights, so YX 5845 is 11 points ahead of it. Republic flew 1,763 flights on the same city pair under all its flight numbers, including this one, and those ran 79.1% on time. Across its whole network Republic Airways managed 78.5%, which this flight beats by 9 points.

YX 5845 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5845thin sample	331	87.7%	45 min	2.11%	A
All Republic Airways on BOS–PHL	1,763	79.1%	69 min	3.29%	B−
All carriers on BOS–PHL	4,961	76.5%	87 min	2.92%	B
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5845 quarter by quarter

YX 5845 did not run the same all year. Its best quarter was Apr–Jun 2026 at 92.2% on time and its weakest Jan–Mar 2026 at 80.7%, a swing of 12 points on roughly 83 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 202574 flights89.2%
Oct–Dec 202579 flights88.3%
Jan–Mar 202687 flights80.7%
Apr–Jun 202691 flights92.2%

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

By weekday, YX 5845 did best on Wednesday at 96.1% on time and worst on Monday at 81.6%. Each day rests on about 47 flights, so a gap of 15 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5845 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 1,789 reported delay minutes.

National Airspace System
41%
Carrier
34%
Late-arriving aircraft
23%
Extreme weather
2%

41% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 740 minutes out of 1,789, against a national NAS share of 21%. The split is drawn from 1,789 delay minutes reported on YX 5845.

Cancellations sit at 2.11% 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 2.2% 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.

YX 5845 is not only a BOS to PHL flight. It also flew PHL to BOS (320 flights, 89.4% on time) often enough to be scored on its own. Airlines attach one number to several legs of an aircraft's day, and each leg keeps its own record here, so check which city pair is on your booking before reading a rate.

One caution: this is a thin sample. 331 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.

Other routes flown as YX 5845
Also flown as	Flights	On time	Avg delay	Cancelled	Grade
PHL to BOSthin sample	320	89.4%	58 min	2.81%	A

What to do with this

Booking YX 5845

For a booking, read YX 5845 as 87.7% on time with 2.11% cancelled over 331 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