Carrier route record
OHCHS→PHL
PSA Airlines · Charleston to Philadelphia
- Flights
- 265
- Period
- July 2025 to June 2026
- Share of route
- 24%
- Carriers
- 4
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with PSA Airlines.
PSA on CHS to PHL lands a B−, about a point better than the national rate of 77.6%. About one flight in five arrives 15 minutes late or worse, and those flights are late by close to two hours on average. That is a workable record, not a spotless one. That rests on 265 flights, with a median arrival 11 minutes early.
The US average over the same twelve months is 77.6%, so there is little to separate PSA on CHS to PHL from the country as a whole. The variation that matters here is internal: which carrier, and what time of day.
Key figures
On time
78.5%
Arrivals under 15 minutes late, of 256 completed flights
Avg delay
114 min
Across delayed arrivals only, not all flights
Cancelled
3.40%
National rate is 1.81%
Whole route
78.8%
Every carrier on CHS to PHL, 1,109 flights
These figures cover 265 flights between July 2025 and June 2026. Beyond the headline rate, 10.2% 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.
Carrier by carrier
PSA against every carrier on CHS to PHL
PSA flew 265 of the 1,109 flights on CHS to PHL, about 24% of it. Its 78.5% on time is about level with the route as a whole at 78.8%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from Republic at 91.2% to Frontier at 68.5%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
Only one carrier clears this site's 365-flight floor here, so there is no comparison to draw. The table below is the full picture.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| Republic Airwaysthin sample | 34 | 91.2% | 38 min | 0.00% | A+ |
| American Airlines | 736 | 79.4% | 92 min | 1.63% | B |
| PSA Airlines (this page)thin sample | 265 | 78.5% | 114 min | 3.40% | B− |
| Frontier Airlinesthin sample | 74 | 68.5% | 65 min | 1.35% | C |
Departure window
When PSA runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 16 points, against half a point between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am75 flights81.9%
- 8am–11am2 flights—
- 11am–2pm81 flights84.8%
- 2pm–5pm85 flights68.7%
- 5pm–8pm22 flights—
- 8pm–5am—
Scale runs 60% to 90%. Rows with fewer than 30 flights show a dash.
The best window here is not the first bank but the 11am–2pm slot at 84.8% on time, ahead of 2pm–5pm at 68.7%. Where the curve peaks mid-day rather than at dawn, the constraint is usually congestion at one end rather than the aircraft's own rotation. The 2pm–5pm window is the busiest, with 85 flights scheduled in it.
Across the year
PSA on CHS to PHL through the year
- Jul–Sep 202533 flights84.4%
- Oct–Dec 2025111 flights72.7%
- Jan–Mar 202628 flights—
- Apr–Jun 202693 flights83.0%
Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 78.5% on time across 265 flights.
PSA on CHS to PHL did not run the same all year. Its best quarter was Jul–Sep 2025 at 84.4% on time and its weakest Oct–Dec 2025 at 72.7%, a swing of 12 points on roughly 88 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.
Across the week, Friday is the strongest day at 91.2% on time and Thursday the weakest at 69.7%. 22 points is a smaller lever than departure hour, but it is free.
Delay causes
Why PSA runs late on this route
One category carries most of the weight here. Carrier accounts for 44% of the 6,273 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.
- 44%Carrier
- 41%Late-arriving aircraft
- 13%National Airspace System
- 1%Extreme weather
41% 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 6,273 reported delay minutes here, that single category outweighs weather by 36 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 6,273 reported delay minutes.
The largest share of delay minutes, 44%, falls under carrier control: crew scheduling, maintenance, fuelling, baggage. Unlike weather, that is a management outcome, and it is the category where the gap between two carriers on the same schedule is genuinely earned. It accounts for 2,788 of the 6,273 delay minutes reported here.
Cancellations run at 3.40%, against 1.81% 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 stage length
What a delay here costs
For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 10.2% 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 550 miles between these two airports put this in the middle of the US network, around two and a half to three hours of block time. That is enough cruise to absorb a ten-minute late pushback and not enough to absorb thirty. It is also long enough that the aircraft usually flies three or four legs a day rather than six, which slows how fast delay compounds.
The return leg runs 76.8% on time across 266 flights, within 2 points of this direction. The two legs are scored separately because they usually differ; on this city pair they happen not to.
One caution: this is a thin sample. 265 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 PSA on CHS to PHL
Put together: the delay figures matter less here than the 3.40% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 11am–2pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 256 completed flights over 12 months sit behind that.
Related
Where to go next
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.