Flight number record
OH 5620
PSA Airlines · Knoxville to Philadelphia
- Route
- TYS → PHL
- Departs
- 07:00
- Flights
- 308
- Period
- July 2025 to June 2026
Historical statistics for July 2025 to June 2026, not live status. For today’s OH 5620, check with PSA Airlines. PSA Airlines flies under contract for larger airlines, so a ticket for this flight may show a different airline code and number.
OH 5620 earns an A−. More than four flights in five arrive inside the 15-minute window the DOT uses to define an on-time arrival, which puts it 8 points better than the national rate of 77.6%. When something does go wrong the average delay runs about 2.1 hours. That rests on 308 flights, with a median arrival 14 minutes early.
Set against the rest of the country, OH 5620's record is 8 points better than the US average of 77.6%. That gap is worth roughly 75 fewer late arrivals for every thousand flights.
Key figures
On time
85.1%
Arrivals under 15 minutes late, of 296 completed flights
Avg delay
128 min
Across delayed arrivals only, not all flights
Cancelled
3.90%
National rate is 1.81%
1 hour+ late
9.1%
National rate is 8.1%
These figures cover 308 flights between July 2025 and June 2026. Beyond the headline rate, 9.1% 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 OH 5620 flies
OH 5620 flies TYS to PHL without a single fixed slot. Its most common scheduled departure was 07:00, used on 69 of 308 flights, with 07:35 (44 flights) and 06:12 (41 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.
- Departs 07:0069 flights22.4%
- Departs 07:3544 flights14.3%
- Departs 06:1241 flights13.3%
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 07:00 departure sits in the 5am–8am window. Across every US flight scheduled in that window the on-time rate is 89.3%, and OH 5620 runs 4 points worse at 85.1%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Against the route
OH 5620 next to TYS to PHL
Every carrier on TYS to PHL combined arrived on time 83.4% of the time across 332 flights, so OH 5620 is 2 points ahead of it. Across its whole network PSA Airlines managed 74.6%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OH 5620thin sample | 308 | 85.1% | 128 min | 3.90% | A− |
| All PSA Airlines on TYS–PHLthin sample | 320 | 84.1% | 127 min | 3.75% | B− |
| All carriers on TYS–PHLthin sample | 332 | 83.4% | 120 min | 3.61% | B− |
| PSA Airlines, whole network | 241,957 | 74.6% | 94 min | 4.34% | C− |
Across the year
OH 5620 quarter by quarter
OH 5620 did not run the same all year. Its best quarter was Jan–Mar 2026 at 91.9% on time and its weakest Apr–Jun 2026 at 81.9%, a swing of 10 points on roughly 77 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 202591 flights87.2%
- Oct–Dec 202591 flights83.3%
- Jan–Mar 202642 flights91.9%
- Apr–Jun 202684 flights81.9%
Scale runs 75% to 95%. Rows with fewer than 30 flights show a dash.
By weekday, OH 5620 did best on Friday at 92.9% on time and worst on Saturday at 75.6%. Each day rests on about 44 flights, so a gap of 17 points is worth noticing but could still narrow in another year.
Delay causes
Why OH 5620 runs late
One category carries most of the weight here. Carrier accounts for 68% of the 5,626 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.
- 68%Carrier
- 20%Late-arriving aircraft
- 9%Extreme weather
- 3%National Airspace System
- 0%Security
The largest share of delay minutes, 68%, 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 3,806 of the 5,626 delay minutes reported here. The split is drawn from 5,626 delay minutes reported on OH 5620.
Cancellations run at 3.90%, against 1.81% nationally. That is about one flight in 25 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. 9.1% 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 555 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 same number turns up on one other city pair in the data, including CLT to GSP (30), but none flew often enough under OH 5620 to report a rate for. Carriers move flight numbers between routes, so the figures on this page apply to TYS to PHL only.
One caution: this is a thin sample. 308 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 OH 5620
For a booking, the cancellation rate is the figure to plan around on OH 5620: 3.90% of its 308 scheduled flights did not operate. A late arrival costs about 2.1 hours, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- Philadelphia International (PHL) delay statistics
- PSA Airlines on-time record
- Every PSA Airlines flight number with a record
- The most and least reliable flight numbers in the US
- What a cancellation rate actually tells you (and what it hides)
A flight number here means PSA Airlines’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.