Flight number record
YX 5729
Republic Airways · Washington to Lexington
- Route
- DCA → LEX
- Departs
- 21:05
- Flights
- 304
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s YX 5729, 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 5729 sits in the middle of the pack with a C−. Close to three flights in four arrive on time by the DOT's definition, 3 points worse than the national rate of 77.3%. The late ones land an hour and a half behind schedule. That rests on 304 flights, with a median arrival 9 minutes early.
Key figures
On time
74.7%
Arrivals under 15 minutes late, of 293 completed flights
Avg delay
98 min
Across delayed arrivals only, not all flights
Cancelled
3.29%
National rate is 1.89%
1 hour+ late
15.4%
National rate is 8.3%
These figures cover 304 flights between September 2025 and August 2026. Beyond the headline rate, 15.4% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Schedule
When YX 5729 flies
YX 5729 flies DCA to LEX without a single fixed slot. Its most common scheduled departure was 21:05, used on 70 of 304 flights, with 21:00 (56 flights) and 21:30 (56 flights) next.
- Departs 21:0570 flights23.0%
- Departs 21:0056 flights18.4%
- Departs 21:3056 flights18.4%
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 21:05 departure sits in the 8pm–5am window. Across every US flight scheduled in that window the on-time rate is 70.1%, and YX 5729 runs 5 points better at 74.7%. 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 5729 next to DCA to LEX
Across its whole network Republic Airways managed 78.1%, which this flight trails by 3 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| YX 5729thin sample | 304 | 74.7% | 98 min | 3.29% | C− |
| All Republic Airways on DCA–LEXthin sample | 304 | 74.7% | 98 min | 3.29% | C− |
| All carriers on DCA–LEXthin sample | 304 | 74.7% | 98 min | 3.29% | C− |
| Republic Airways, whole network | 364,452 | 78.1% | 74 min | 4.55% | B− |
Across the year
YX 5729 quarter by quarter
YX 5729 did not run the same all year. Its best quarter was Apr–Jun 2026 at 79.7% on time and its weakest Jul–Sep 2026 at 64.0%, a swing of 16 points on roughly 76 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 202572 flights78.9%
- Jan–Mar 202675 flights72.2%
- Apr–Jun 202678 flights79.7%
- Jul–Sep 202653 flights64.0%
Scale runs 55% to 85%. Rows with fewer than 30 flights show a dash.
By weekday, YX 5729 did best on Tuesday at 81.6% on time and worst on Thursday at 69.4%. Each day rests on about 43 flights, so a gap of 12 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late YX 5729 runs when it is late
YX 5729 often beats the schedule: 97 of 293 completed flights, 33%, arrived 15 minutes or more early. When YX 5729 is late it tends to be very late: 45 of its 74 late arrivals were an hour or more behind, and 16 were two hours or more.
- 15+ min early97 flights33.1%
- Within 15 min122 flights41.6%
- 15–29 min late12 flights4.1%
- 30–59 min late17 flights5.8%
- 1–2 hours late29 flights9.9%
- 2+ hours late16 flights5.5%
Scale runs 0% to 100%.
Share of 293 completed flights by arrival against schedule.
12 of 79 late departures made up the time and arrived on time, 15% of them. 7 flights left on time and still arrived late.
The worst days
Worst days for YX 5729
The latest arrival of the period was on 13 March 2026, 15 hours 12 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 |
|---|---|---|
| 13 March 2026 | 15 hours 12 minutes | National Airspace System |
| 12 June 2026 | 10 hours 51 minutes | Carrier |
| 13 May 2026 | 3 hours 1 minute | Late-arriving aircraft |
| 7 August 2026 | 2 hours 59 minutes | Late-arriving aircraft |
| 14 April 2026 | 2 hours 56 minutes | Late-arriving aircraft |
Delay causes
Why YX 5729 runs late
Late-arriving aircraft accounts for 53% of the 7,232 delay minutes carriers reported here, and the remaining four split what is left.
- 53%Late-arriving aircraft
- 25%Carrier
- 21%National Airspace System
- 0%Extreme weather
53% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 7,232 reported delay minutes here, that single category outweighs weather by 53 to one. The split is drawn from 7,232 delay minutes reported on YX 5729.
Cancellations run at 3.29%, against 1.89% nationally. That is about one flight in 30 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
15.4% 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 LGA to GSO (1), but none flew often enough under YX 5729 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to DCA to LEX only.
One caution: this is a thin sample. 304 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 5729
For a booking, the cancellation rate is the figure to plan around on YX 5729: 3.29% of its 304 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
- Ronald Reagan Washington National (DCA) 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.