Flight number record
YX 5845
Republic Airways · Boston to Philadelphia
- Route
- BOS → PHL
- Departs
- 06:50
- Flights
- 345
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 12 points better than the national rate of 77.3%. When something does go wrong the average delay runs about 50 minutes. That rests on 345 flights, with a median arrival 14 minutes early.
Set against the rest of the country, YX 5845's record is 12 points better than the US average of 77.3%. That gap is worth roughly 117 fewer late arrivals for every thousand flights.
Key figures
On time
89.0%
Arrivals under 15 minutes late, of 336 completed flights
Avg delay
49 min
Across delayed arrivals only, not all flights
Cancelled
2.61%
National rate is 1.89%
1 hour+ late
2.7%
National rate is 8.3%
These figures cover 345 flights between September 2025 and August 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.
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Schedule
When YX 5845 flies
YX 5845 flies BOS to PHL without a single fixed slot. Its most common scheduled departure was 06:50, used on 61 of 345 flights.
- Departs 06:5061 flights17.7%
Scale runs 0% to 100%.
Share of scheduled departures at each local time. Times used on fewer than one flight in ten are not listed.
A 06:50 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and YX 5845 runs level with that at 89.0%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
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Against the route
YX 5845 next to BOS to PHL
Every carrier on BOS to PHL combined arrived on time 76.0% of the time across 5,036 flights, so YX 5845 is 13 points ahead of it. Republic flew 1,824 flights on the same city pair under all its flight numbers, including this one, and those ran 78.4% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5845thin sample | 345 | 89.0% | 49 min | 2.61% | A |
| All Republic Airways on BOS–PHL | 1,824 | 78.4% | 72 min | 4.22% | B− |
| All carriers on BOS–PHL | 5,036 | 76.0% | 89 min | 3.46% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 5845 quarter by quarter
YX 5845 did not run the same all year. Its best quarter was Jul–Sep 2026 at 95.0% on time and its weakest Jan–Mar 2026 at 80.7%, a swing of 14 points on roughly 86 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 202526 flights—
- Oct–Dec 202579 flights88.3%
- Jan–Mar 202687 flights80.7%
- Apr–Jun 202691 flights92.2%
- Jul–Sep 202662 flights95.0%
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 83.7%. Each day rests on about 49 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5845 runs when it is late
YX 5845 often beats the schedule: 164 of 336 completed flights, 49%, arrived 15 minutes or more early. The 37 late arrivals split 17 under half an hour, 11 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early164 flights48.8%
- Within 15 min135 flights40.2%
- 15–29 min late17 flights5.1%
- 30–59 min late11 flights3.3%
- 1–2 hours late7 flights2.1%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 336 completed flights by arrival against schedule.
7 of 30 late departures made up the time and arrived on time, 23% of them. 14 flights left on time and still arrived late.
The worst days
Worst days for YX 5845
The latest arrival of the period was on 5 November 2025, 2 hours 46 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The five worst days are spread across November, January and August, with no single month standing out.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 5 November 2025 | 2 hours 46 minutes | Late-arriving aircraft |
| 19 January 2026 | 2 hours 43 minutes | National Airspace System |
| 22 August 2026 | 1 hour 56 minutes | Carrier |
| 27 January 2026 | 1 hour 54 minutes | Late-arriving aircraft |
| 31 August 2026 | 1 hour 42 minutes | Carrier |
Delay causes
Why YX 5845 runs late
Carrier accounts for 48% of the 1,817 delay minutes carriers reported here, and the remaining four split what is left.
- 48%Carrier
- 30%National Airspace System
- 20%Late-arriving aircraft
- 2%Extreme weather
The largest share of delay minutes, 48%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. It accounts for 873 of the 1,817 delay minutes reported here. The split is drawn from 1,817 delay minutes reported on YX 5845.
Cancellations run at 2.61%, against 1.89% nationally. That is about one flight in 40 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
Badly late arrivals are rare here: only 2.7% land an hour or more behind schedule, against 8.3% 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 (330 flights, 90.0% 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. 345 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.
| Also flown as | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| PHL to BOSthin sample | 330 | 90.0% | 62 min | 3.33% | A− |
What to do with this
Booking YX 5845
For a booking, the cancellation rate is the figure to plan around on YX 5845: 2.61% of its 345 scheduled flights did not operate. A late arrival costs about 50 minutes, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to PHL, every carrier and departure
- PHL to BOS, the return direction
- Boston Logan International (BOS) delay statistics
- Philadelphia International (PHL) delay statistics
- Republic Airways on-time record
- Every Republic Airways flight number with a record
- The most and least reliable flight numbers in the US
- The best time of day to fly, according to 7.05 million flight records
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.