Flight number record
YX 5740
Republic Airways · Philadelphia to Boston
- Route
- PHL → BOS
- Departs
- 06:00
- Flights
- 365
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs a little over an hour. That rests on 365 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 77.3%. That gap is worth roughly 149 fewer late arrivals for every thousand flights.
Key figures
On time
92.2%
Arrivals under 15 minutes late, of 358 completed flights
Avg delay
69 min
Across delayed arrivals only, not all flights
Cancelled
1.92%
National rate is 1.89%
1 hour+ late
2.5%
National rate is 8.3%
These figures cover 365 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.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 269 of 365 flights, with 06:02 (59 flights) next.
- Departs 06:00269 flights73.7%
- Departs 06:0259 flights16.2%
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 06:00 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 92.2%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
YX 5740 next to PHL to BOS
Every carrier on PHL to BOS combined arrived on time 74.5% of the time across 5,035 flights, so YX 5740 is 18 points ahead of it. Republic flew 1,822 flights on the same city pair under all its flight numbers, including this one, and those ran 80.3% on time. Across its whole network Republic Airways managed 78.1%, which this flight beats by 14 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5740 | 365 | 92.2% | 69 min | 1.92% | A |
| All Republic Airways on PHL–BOS | 1,822 | 80.3% | 78 min | 4.01% | B− |
| All carriers on PHL–BOS | 5,035 | 74.5% | 81 min | 3.42% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | 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 100.0% on time and its weakest Jan–Mar 2026 at 87.1%, a swing of 13 points on roughly 73 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 202530 flights100.0%
- Oct–Dec 202592 flights90.1%
- Jan–Mar 202690 flights87.1%
- Apr–Jun 202691 flights95.6%
- Jul–Sep 202662 flights93.4%
Scale runs 80% to 100%.
By weekday, YX 5740 did best on Thursday at 98.1% on time and worst on Sunday at 86.0%. Each day rests on about 52 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5740 runs when it is late
YX 5740 often beats the schedule: 174 of 358 completed flights, 49%, arrived 15 minutes or more early. The 28 late arrivals split 11 under half an hour, 8 between 30 and 60 minutes, and 9 an hour or more.
- 15+ min early174 flights48.6%
- Within 15 min156 flights43.6%
- 15–29 min late11 flights3.1%
- 30–59 min late8 flights2.2%
- 1–2 hours late7 flights2.0%
- 2+ hours late2 flights0.6%
Scale runs 0% to 100%.
Share of 358 completed flights by arrival against schedule.
Only 18 of 358 completed flights left 15 minutes late or more, too few to say how often the time is made up.
The worst days
Worst days for YX 5740
The latest arrival of the period was on 13 June 2026, 8 hours 32 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on three of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 13 June 2026 | 8 hours 32 minutes | Carrier |
| 14 July 2026 | 3 hours 53 minutes | Carrier |
| 9 February 2026 | 1 hour 51 minutes | Extreme weather |
| 14 June 2026 | 1 hour 51 minutes | Carrier |
| 24 August 2026 | 1 hour 28 minutes | Extreme weather |
Delay causes
Why YX 5740 runs late
Carrier accounts for 58% of the 1,935 delay minutes carriers reported here, and the remaining four split what is left.
- 58%Carrier
- 25%National Airspace System
- 16%Extreme weather
- 1%Late-arriving aircraft
Extreme weather accounts for 16% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 2.6 times the usual weather exposure. The split is drawn from 1,935 delay minutes reported on YX 5740.
Cancellations sit at 1.92% against a national 1.89%, 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 2.5% 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.
Every one of the 365 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. 365 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 92.2% on time with 1.92% cancelled over 365 flights. Those are rates from the past twelve months, not a forecast for any particular day.
Related
Where to go next
- PHL to BOS, every carrier and departure
- BOS to PHL, the return direction
- Republic Airways 5845 on the same route90.0%
- American Airlines 1874 on the same route72.0%
- Philadelphia International (PHL) delay statistics
- Boston Logan International (BOS) 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
- Worst months to fly in the US, ranked by the data
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.