Flight number record
OH 5620
PSA Airlines · Knoxville to Philadelphia
- Route
- TYS → PHL
- Departs
- 07:00
- Flights
- 309
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 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 77.3%. When something does go wrong the average delay runs close to two hours. That rests on 309 flights, with a median arrival 15 minutes early.
Set against the rest of the country, OH 5620's record is 8 points better than the US average of 77.3%. That gap is worth roughly 80 fewer late arrivals for every thousand flights.
Key figures
On time
85.3%
Arrivals under 15 minutes late, of 299 completed flights
Avg delay
101 min
Across delayed arrivals only, not all flights
Cancelled
3.24%
National rate is 1.89%
1 hour+ late
8.7%
National rate is 8.3%
These figures cover 309 flights between September 2025 and August 2026. Beyond the headline rate, 8.7% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
Fare search by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
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 309 flights, with 06:12 (42 flights) and 07:44 (37 flights) next.
- Departs 07:0069 flights22.3%
- Departs 06:1242 flights13.6%
- Departs 07:4437 flights12.0%
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 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 85.3%. Early departures usually start with an aircraft that has not flown yet that day, which is most of why the window does well.
Timetable by Aviasales, a Travelpayouts partner. Booking through it may earn this site a commission at no cost to you; it changes no figure here.
Against the route
OH 5620 next to TYS to PHL
Every carrier on TYS to PHL combined arrived on time 82.1% of the time across 351 flights, so OH 5620 is 3 points ahead of it. Across its whole network PSA Airlines managed 73.5%, which this flight beats by 12 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| OH 5620thin sample | 309 | 85.3% | 101 min | 3.24% | A− |
| All PSA Airlines on TYS–PHLthin sample | 321 | 84.2% | 103 min | 3.12% | B− |
| All carriers on TYS–PHLthin sample | 351 | 82.1% | 99 min | 2.85% | B |
| PSA Airlines, whole network | 242,979 | 73.5% | 96 min | 4.80% | C− |
Across the year
OH 5620 quarter by quarter
OH 5620 did not run the same all year. Its best quarter was Jul–Sep 2025 at 96.7% on time and its weakest Apr–Jun 2026 at 81.9%, a swing of 15 points on roughly 62 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 202530 flights96.7%
- Oct–Dec 202591 flights83.3%
- Jan–Mar 202642 flights91.9%
- Apr–Jun 202684 flights81.9%
- Jul–Sep 202662 flights83.1%
Scale runs 75% to 100%.
By weekday, OH 5620 did best on Friday at 93.0% on time and worst on Sunday at 77.5%. Each day rests on about 44 flights, so a gap of 16 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late OH 5620 runs when it is late
OH 5620 often beats the schedule: 150 of 299 completed flights, 50%, arrived 15 minutes or more early. When OH 5620 is late it tends to be very late: 26 of its 44 late arrivals were an hour or more behind, and 12 were two hours or more.
- 15+ min early150 flights50.2%
- Within 15 min105 flights35.1%
- 15–29 min late9 flights3.0%
- 30–59 min late9 flights3.0%
- 1–2 hours late14 flights4.7%
- 2+ hours late12 flights4.0%
Scale runs 0% to 100%.
Share of 299 completed flights by arrival against schedule.
9 of 49 late departures made up the time and arrived on time, 18% of them. Only 4 left on time and still arrived late.
The worst days
Worst days for OH 5620
The latest arrival of the period was on 28 October 2025, 9 hours 44 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). The same cause led on five of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 28 October 2025 | 9 hours 44 minutes | Carrier |
| 10 August 2026 | 5 hours 24 minutes | Carrier |
| 28 January 2026 | 4 hours 6 minutes | Carrier |
| 28 May 2026 | 4 hours 3 minutes | Carrier |
| 25 November 2025 | 3 hours 41 minutes | Carrier |
Delay causes
Why OH 5620 runs late
Carrier accounts for 80% of the 4,447 delay minutes carriers reported here, and the remaining four split what is left.
- 80%Carrier
- 11%Extreme weather
- 5%Late-arriving aircraft
- 4%National Airspace System
- 1%Security
Extreme weather accounts for 11% of delay minutes, well above the single-digit share typical across the system. Weather delays are lumpy: they arrive as whole bad days rather than as a steady drag, so the quarterly figures above are the more useful view of the risk. The national share is 6%, so this operation carries roughly 1.8 times the usual weather exposure. The split is drawn from 4,447 delay minutes reported on OH 5620.
Cancellations run at 3.24%, 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
8.7% of arrivals land an hour or more late, close to the national 8.3%, so a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last close to two hours, which a normal layover absorbs.
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.
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. 309 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: 3.24% of its 309 scheduled flights did not operate. A late arrival costs close to two 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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.