Flight number record
YX 5831
Republic Airways · Boston to New York
- Route
- BOS → LGA
- Departs
- 18:00
- Flights
- 290
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5831, 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 5831 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is an hour and a half behind schedule. Build slack into anything you connect to. That rests on 290 flights, with a median arrival 2 minutes early.
The national on-time rate over the same period is 77.3%, so YX 5831 runs 15 points behind the country as a whole. Across a thousand flights that is about 151 extra late arrivals.
Key figures
On time
62.2%
Arrivals under 15 minutes late, of 262 completed flights
Avg delay
89 min
Across delayed arrivals only, not all flights
Cancelled
9.66%
National rate is 1.89%
1 hour+ late
22.9%
National rate is 8.3%
These figures cover 290 flights between September 2025 and August 2026. Beyond the headline rate, 22.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 5831 flies
YX 5831 is scheduled to leave Boston (BOS) at 18:00 local time and reach New York (LGA) at 19:31. That slot held for 290 of the 290 scheduled departures in the data, so the figures below describe one steady operation rather than a number that moved around the clock.
- Departs 18:00290 flights100.0%
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 18:00 departure sits in the 5pm–8pm window. Across every US flight scheduled in that window the on-time rate is 68.0%, and YX 5831 runs 6 points worse at 62.2%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.
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Against the route
YX 5831 next to BOS to LGA
Every carrier on BOS to LGA combined arrived on time 76.2% of the time across 7,442 flights, so YX 5831 is 14 points behind it. Republic flew 6,971 flights on the same city pair under all its flight numbers, including this one, and those ran 75.2% on time. Across its whole network Republic Airways managed 78.1%, which this flight trails by 16 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5831thin sample | 290 | 62.2% | 89 min | 9.66% | D− |
| All Republic Airways on BOS–LGA | 6,971 | 75.2% | 77 min | 6.50% | B− |
| All carriers on BOS–LGA | 7,442 | 76.2% | 78 min | 6.40% | B− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 5831 quarter by quarter
YX 5831 did not run the same all year. Its best quarter was Apr–Jun 2026 at 69.9% on time and its weakest Jul–Sep 2026 at 44.4%, a swing of 26 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 202526 flights—
- Oct–Dec 202567 flights61.3%
- Jan–Mar 202674 flights66.7%
- Apr–Jun 202678 flights69.9%
- Jul–Sep 202645 flights44.4%
Scale runs 35% to 75%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5831 did best on Monday at 69.8% on time and worst on Thursday at 53.5%. Each day rests on about 41 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5831 runs when it is late
YX 5831 often beats the schedule: 80 of 262 completed flights, 31%, arrived 15 minutes or more early. When YX 5831 is late it tends to be very late: 60 of its 99 late arrivals were an hour or more behind, and 22 were two hours or more.
- 15+ min early80 flights30.5%
- Within 15 min83 flights31.7%
- 15–29 min late21 flights8.0%
- 30–59 min late18 flights6.9%
- 1–2 hours late38 flights14.5%
- 2+ hours late22 flights8.4%
Scale runs 0% to 100%.
Share of 262 completed flights by arrival against schedule.
Time lost at the gate mostly stays lost. Of 103 departures that left 15 minutes late or more, only 10 made it up before arrival. 6 flights left on time and still arrived late.
The worst days
Worst days for YX 5831
The latest arrival of the period was on 11 December 2025, 5 hours 49 minutes behind schedule; most of its delay minutes were filed as national airspace system delay. On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 11 December 2025 | 5 hours 49 minutes | National Airspace System |
| 26 January 2026 | 5 hours 32 minutes | Late-arriving aircraft |
| 10 November 2025 | 4 hours 14 minutes | National Airspace System |
| 7 August 2026 | 3 hours 58 minutes | Late-arriving aircraft |
| 14 October 2025 | 3 hours 55 minutes | Late-arriving aircraft |
Delay causes
Why YX 5831 runs late
Late-arriving aircraft accounts for 43% of the 8,757 delay minutes carriers reported here, and the remaining four split what is left.
- 43%Late-arriving aircraft
- 42%National Airspace System
- 15%Carrier
- 0%Extreme weather
43% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 8,757 reported delay minutes here, that single category outweighs weather by 43 to one. The split is drawn from 8,757 delay minutes reported on YX 5831.
Cancellations run at 9.66%, against 1.89% nationally. That is about one flight in ten 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
22.9% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The same number turns up on one other city pair in the data, including CVG to BOS (9), but none flew often enough under YX 5831 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to BOS to LGA only.
One caution: this is a thin sample. 290 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 5831
For a booking, the cancellation rate is the figure to plan around on YX 5831: 9.66% of its 290 scheduled flights did not operate. A late arrival costs an hour and a half, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- BOS to LGA, every carrier and departure
- LGA to BOS, the return direction
- Republic Airways 5721 on the same route67.1%
- Republic Airways 5736 on the same route73.5%
- Republic Airways 5716 on the same route61.4%
- Republic Airways 5744 on the same route85.8%
- Republic Airways 5730 on the same route77.1%
- Republic Airways 5732 on the same route86.1%
- Boston Logan International (BOS) delay statistics
- LaGuardia (LGA) 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
- Why the first flight of the morning is statistically safest
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.