Flight profile · United Airlines
UA557
Charleston (CHS) to Denver (DEN) · scheduled 4:00 PM – 6:20 PM
How UA557 performs
935 operations, October 2023 – August 2026.
Between its first and last recorded date on CHS → DEN, UA557 averaged about 6 operations a week (935 in 1,038 days, cancelled ones included).
UA557 arrived on time 72.2% of the time, against 75.1% for all CHS → DEN flights, so this departure is 2.9 percentage points worse than the route as a whole. Against United Airlines’ own flights on this route it is 2.3 points worse.
Source: US DOT Bureau of Transportation Statistics · 935 operations, October 2023 – August 2026 · If UA557 is cancelled or significantly changed, DOT’s automatic refund rule may entitle you to your money back. The refund checker walks through eligibility.
Where UA557 is right now
A live reading, only if you ask for it. It is not part of the reliability record above.
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Against the rest of the route
| Flight or route | On time | Cancelled | Median delay | Severe | Flights |
|---|---|---|---|---|---|
| UA557 | 72.2% | 0.86% | 0 min | 11.5% | 935 |
| United Airlines on CHS → DEN | 74.5% | 0.89% | -2 min | 10.1% | 1,241 |
| All CHS → DEN flights | 75.1% | 0.68% | -3 min | 9.1% | 2,201 |
UA557 cancelled 8 of 935 operations (0.86%), close to the 0.68% for CHS → DEN.
11.5% of UA557’s arrivals were an hour or more late, against 9.1% across CHS → DEN, so the long delays are more common on this number than on the route.
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – August 2026
Why UA557 runs late
Where US DOT attributed the delay minutes on this flight.
airspace and airport capacity, including weather-driven flow control
the inbound aircraft was late, so this flight started late
crew, maintenance, boarding and fueling, all within the carrier’s control
weather severe enough to stop this flight specifically
Share of the delay minutes US DOT attributed to each cause for UA557 on CHS → DEN. Only delays of 15 minutes or more are attributed. What the five causes mean
Source: US DOT Bureau of Transportation Statistics · Data covering October 2023 – August 2026
Does a late aircraft delay this flight?
How often the plane that flies UA557 comes in late, and what that does to the departure.
When the aircraft came in 15 or more minutes late, UA557 pushed back an average of 45 minutes late; when it came in on time or early, an average of 8 minutes late.
Matched by tail number to the aircraft’s previous flight into CHS: 920 of 927 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 |
|---|---|---|---|
| UA557 | 18% | 73% | 12% |
| Network, same turn | 17% | 69% | 9% |
61 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 60 to 89 minutes. How often UA557’s aircraft landed 15 or more minutes late is about the same as the network’s and, once the aircraft was late, how often UA557 left 15 or more minutes late is higher than the network’s.
Which Flight Numbers Pay for a Late Aircraft ranks the flight numbers that pass a late aircraft on.
Source: US DOT Bureau of Transportation Statistics · Data covering October 2023 – August 2026
From pushback to gate
When it leaves CHS late, does that still matter by the time it reaches DEN?
On arrival at DEN, UA557 spends 11.4 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 1.6 minutes longer than a typical DEN arrival (9.8 min).
Taxi-out is gate to wheels up and sits inside the scheduled block; the hourly comparison is 5,810 CHS departures. Taxi-in is landing to gate, set against 991,579 arrivals at DEN. More on taxi time.
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – August 2026
The hour it leaves CHS
UA557 has one departure time, 4:00 PM, so this is what that hour at CHS is worth.
On-time arrival rate. 5,810 departures from CHS are scheduled in the 4 PM–5 PM hour over the period, against 79,421 across the whole day.
UA557 is scheduled out of CHS at 4:00 PM, in the 4 PM–5 PM bank. Departures from CHS in that hour arrive on time 73.2% of the time against 80.4% across the airport’s whole day — the slot alone is worth 7.2 points worse before anything about this particular flight is considered.
Both airport figures cover every destination from CHS, 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 · October 2023 – August 2026 · Hours below 120 departures are not scored.
By day of week
Does UA557 run worse on particular days?
Monday is historically the most reliable day and Saturday the least, a gap of 15.5 percentage points.
Source: FlyerIntel analysis of US DOT BTS data · October 2023 – August 2026 · Days with fewer than 120 operations are not scored.
Other routes UA557 has flown
Carriers reassign flight numbers. UA557 also served these 11 other city pairs in the period.
| Route | Operated | Flights | On time |
|---|---|---|---|
| DEN→JAC Denver to Jackson | August 15–22, 2026 | 2 | — |
| BIL→DEN Billings to Denver | June 25, 2026 – August 10, 2026 | 47 | — |
| DEN→HDN Denver to Hayden | March 5–28, 2026 | 24 | — |
| DEN→SNA Denver to Santa Ana | December 18, 2025 – January 5, 2026 | 14 | — |
| DEN→RDM Denver to Redmond | March 7–30, 2024 | 24 | — |
| FLL→CLE Fort Lauderdale to Cleveland | December 21, 2023 – January 8, 2024 | 19 | — |
| ORD→PBI Chicago to West Palm Beach | November 23, 2023 | 1 | — |
| BOS→EWR Boston to Newark | October 1–28, 2023 | 28 | — |
| DFW→DEN Dallas–Fort Worth to Denver | September 29, 2023 | 1 | — |
| DCA→IAH Washington to Houston | September 5–28, 2023 | 24 | — |
| DEN→IAD Denver to Washington | July 1, 2023 – September 4, 2023 | 66 | — |
The figures above describe only CHS → DEN, the route UA557 flies now.
When it goes wrong
The average describes a usual day. This is the day that ruins a connection.
67 min late
against a median of 0 min early
UA557 has an average that understates its risk: a typical arrival is 0 min early, but the worst tenth are 67 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 935 operations; cancelled and diverted flights are counted separately.
Source: US DOT Bureau of Transportation Statistics · Data covering October 2023 – August 2026
Data and methodology
Calculated by FlyerIntel from 935 records of UA557 operating CHS → DEN, 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