Flight profile · Republic Airways
YX4520
Washington (DCA) to Indianapolis (IND) · scheduled 7:45 PM – 9:30 PM
How YX4520 performs
616 operations, August 2023 – August 2026.
Between its first and last recorded date on DCA → IND, YX4520 averaged about 4 operations a week (616 in 1,113 days, cancelled ones included).
YX4520 arrived on time 72.7% of the time, against 81.0% for all DCA → IND flights, so this departure is 8.3 percentage points worse than the route as a whole. Against Republic Airways’ own flights on this route it is 9.5 points worse.
Source: US DOT Bureau of Transportation Statistics · 616 operations, August 2023 – August 2026 · If YX4520 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where YX4520 is right now
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| YX4520 | 72.7% | 6.01% | -7 min | 12.5% | 616 |
| Republic Airways on DCA → IND | 82.2% | 2.71% | -11 min | 6.9% | 5,417 |
| All DCA → IND flights | 81.0% | 2.82% | -10 min | 7.6% | 6,389 |
YX4520 has cancelled 6.01% of its scheduled departures (37 of 616), against 2.82% for all DCA → IND flights — this specific departure cancels 3.2 percentage points more often than the route as a whole. Different flight numbers on the same route can carry different aircraft, crews and schedules, so this is a fact about YX4520 specifically, not about the route it flies.
12.5% of YX4520’s arrivals were an hour or more late, against 7.6% across DCA → IND, so the long delays are more common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · August 2023 – August 2026
Why YX4520 runs late
Where US DOT attributed the delay minutes on this flight.
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
airspace and airport capacity, including weather-driven flow control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for YX4520 on DCA → IND. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering August 2023 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies YX4520 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, YX4520 pushed back an average of 39 minutes late; when it came in on time or early, an average of 2 minutes late.
Matched by tail number to the aircraft’s previous flight into DCA: 565 of 580 departures. Unknown, cancelled or diverted inbounds and gaps over 12 hours are left out.
Against the network at the same turn length
| Share of departures | Inbound landed 15+ late | Left 15+ late after a late inbound | Left 15+ late after an on-time inbound |
|---|---|---|---|
| YX4520 | 31% | 63% | 8% |
| Network, same turn | 18% | 85% | 10% |
53 scheduled minutes is enough to clean and board when the aircraft is on time, with little to spare when it is not.
The network row is every flight with a scheduled turn of 45 to 59 minutes. How often YX4520’s aircraft landed 15 or more minutes late is higher than the network’s and, once the aircraft was late, how often YX4520 left 15 or more minutes late is lower than the network’s.
Source: US DOT Bureau of Transportation Statistics · Data covering August 2023 – August 2026
From pushback to gate
When it leaves DCA late, does that still matter by the time it reaches IND?
YX4520 pushes back an average of 17.6 minutes late and reaches the gate at IND an average of 13.6 minutes late. The 3.9 minutes between those two figures are slack the published schedule already carries, so a late pushback is partly, not fully, made up before the gate. Its 21.2 minutes on the taxiways at DCA is about what any departure from the airport in that hour spends.
On arrival at IND, YX4520 spends 9.2 min taxiing from touchdown to the gate — ground time a connecting passenger sits through before they can even leave the aircraft, on top of however late the flight itself ran. That is 2.2 minutes longer than a typical IND arrival (7.0 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 28,734 DCA departures. Taxi-in is landing to gate, set against 151,052 arrivals at IND. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · August 2023 – August 2026
The hour it leaves DCA
YX4520 has one departure time, 7:45 PM, so this is what that hour at DCA is worth.
On-time arrival rate. 28,734 departures from DCA are scheduled in the 7 PM–8 PM hour over the period, against 447,230 across the whole day.
YX4520 is scheduled out of DCA at 7:45 PM, in the 7 PM–8 PM bank. Departures from DCA in that hour arrive on time 66.5% of the time against 76.3% across the airport’s whole day — the slot alone is worth 9.8 points worse before anything about this particular flight is considered.
Both airport figures cover every destination from DCA, so they describe the slot, not this journey; the route comparison is above. Why the hour matters.
Source: FlyerIntel analysis of US DOT BTS data · August 2023 – August 2026 · Hours below 120 departures are not scored.
Other routes YX4520 has flown
Carriers reassign flight numbers. YX4520 also served these 17 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| LGA→XNA New York to Fayetteville/Springdale/Rogers | February 12, 2026 – March 7, 2026 | 24 | — |
| XNA→LGA Fayetteville/Springdale/Rogers to New York | February 12, 2026 – March 6, 2026 | 20 | — |
| DCA→IAH Washington to Houston | January 6, 2026 – February 11, 2026 | 32 | — |
| LGA→TUL New York to Tulsa | December 18, 2025 – January 5, 2026 | 18 | — |
| TUL→LGA Tulsa to New York | December 18, 2025 – January 5, 2026 | 13 | — |
| MSN→MIA Madison to Miami | December 6–13, 2025 | 2 | — |
| RDU→ORD Raleigh–Durham to Chicago | November 22–29, 2025 | 2 | — |
| CID→ORD Cedar Rapids to Chicago | February 18, 2025 – March 5, 2025 | 6 | — |
| ORD→CID Chicago to Cedar Rapids | February 18, 2025 – March 5, 2025 | 6 | — |
| ORD→MCI Chicago to Kansas City | February 13, 2025 – March 3, 2025 | 9 | — |
| MIA→BNA Miami to Nashville | January 11, 2025 – February 8, 2025 | 5 | — |
| ORD→RST Chicago to Rochester | December 5–18, 2024 | 14 | — |
| PHL→PWM Philadelphia to Portland | November 5, 2024 – December 4, 2024 | 25 | — |
| PWM→PHL Portland to Philadelphia | November 5, 2024 – December 4, 2024 | 25 | — |
| JFK→BNA New York to Nashville | November 5, 2023 – April 3, 2024 | 150 | 92.5% |
| LGA→OKC New York to Oklahoma City | July 1, 2023 – August 14, 2023 | 45 | — |
| OKC→LGA Oklahoma City to New York | July 1, 2023 – August 14, 2023 | 45 | — |
The figures above describe only DCA → IND, the route YX4520 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
68 min late
against a median of 7 min early
YX4520 has an average that understates its risk: a typical arrival is 7 min early, but the worst tenth are 75 minutes worse than that. If the trip has something unmissable at the end of it, the median is the wrong number to plan against.
Percentiles over 616 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering August 2023 – August 2026
Other flights on this route
Same airports, same journey, different odds of arriving on time.
| Flight | Airline | On time | Median arrival | Operations |
|---|---|---|---|---|
| YX4701 | Republic Airways | 89.1% | 14 min early | 995 |
| YX4520 this flight | Republic Airways | 72.7% | 7 min early | 616 |
| YX4501 | Republic Airways | 71.4% | 3 min early | 666 |
Among all 3 departures on this route with at least 600 operations, YX4520 has the 2nd highest on-time rate, 16.4 points behind the best. Every departure here has at least 600 operations; the other rows are the most punctual on the route, not all of them.
Data and methodology
Calculated by FlyerIntel from 616 records of YX4520 operating DCA → IND, published by the US DOT Bureau of Transportation Statistics. A flight counts as delayed when it arrives 15 or more minutes after schedule; cancelled and diverted flights are reported separately, not in the on-time rate.
Full methodology · Data sources · Report a problem
Related research: Most and Least Reliable Flight Numbers · The Delay You Inherit · Making Up Time in the Air
Analysis last recomputed