Flight number record

YX 5751

Republic Airways · New York to Washington

Route: LGA → DCA
Departs: 21:25
Flights: 251
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s YX 5751, 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 5751 draws a D−. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 251 flights, with a median arrival 3 minutes early.

The national on-time rate over the same period is 77.6%, so YX 5751 runs 17 points behind the country as a whole. Across a thousand flights that is about 168 extra late arrivals.

On time

60.8%

Arrivals under 15 minutes late, of 227 completed flights

Avg delay

72 min

Across delayed arrivals only, not all flights

Cancelled

9.56%

National rate is 1.81%

1 hour+ late

19.8%

National rate is 8.1%

These figures cover 251 flights between July 2025 and June 2026. Beyond the headline rate, 19.8% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Schedule

When YX 5751 flies

YX 5751 flies LGA to DCA without a single fixed slot. Its most common scheduled departure was 21:25, used on 102 of 251 flights, with 21:45 (85 flights) and 21:20 (26 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 21:25102 flights40.6%
Departs 21:4585 flights33.9%
Departs 21:2026 flights10.4%

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 21:25 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.5%, and YX 5751 runs 10 points worse at 60.8%. By that time of day most aircraft have flown several legs already, and whatever went wrong earlier is still in the schedule.

Against the route

YX 5751 next to LGA to DCA

Every carrier on LGA to DCA combined arrived on time 68.3% of the time across 4,830 flights, so YX 5751 is 8 points behind it. Republic flew 4,751 flights on the same city pair under all its flight numbers, including this one, and those ran 68.4% on time. Across its whole network Republic Airways managed 78.5%, which this flight trails by 18 points.

YX 5751 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
YX 5751thin sample	251	60.8%	72 min	9.56%	D−
All Republic Airways on LGA–DCA	4,751	68.4%	62 min	5.51%	C−
All carriers on LGA–DCA	4,830	68.3%	62 min	5.45%	C−
Republic Airways, whole network	361,482	78.5%	72 min	4.08%	B−

Across the year

YX 5751 quarter by quarter

YX 5751 did not run the same all year. Its best quarter was Jul–Sep 2025 at 75.4% on time and its weakest Oct–Dec 2025 at 51.6%, a swing of 24 points on roughly 63 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 202579 flights75.4%
Oct–Dec 202567 flights51.6%
Jan–Mar 202675 flights54.5%
Apr–Jun 202630 flights60.0%

Scale runs 45% to 80%. Rows with fewer than 30 flights show a dash.

By weekday, YX 5751 did best on Monday at 66.7% on time and worst on Sunday at 52.8%. Each day rests on about 36 flights, so a gap of 14 points is worth noticing but could still narrow in another year.

Delay causes

Why YX 5751 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 54% of the 6,393 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.

Late-arriving aircraft
54%
National Airspace System
22%
Carrier
16%
Extreme weather
8%

54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. That is a cascade, and cascades start small and grow through the day. Across 6,393 reported delay minutes here, that single category outweighs weather by 7 to one. It is the strongest argument for booking the first departure of the morning, when the aircraft has been sitting at the gate overnight with nothing to inherit. The split is drawn from 6,393 delay minutes reported on YX 5751.

Cancellations run at 9.56%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 19.8% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

The same number turns up on three other city pairs in the data, including LGA to BOS (19), LGA to CLT (5) and LGA to STL (1), but none flew often enough under YX 5751 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to LGA to DCA only.

One caution: this is a thin sample. 251 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 5751

For a booking, the cancellation rate is the figure to plan around on YX 5751: 9.56% of its 251 scheduled flights did not operate. A late arrival costs a little over an hour, but a cancellation costs the day, so leave a later option open.

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