Flight number record

F9 1517

Frontier Airlines · Philadelphia to Raleigh

Route: PHL → RDU
Departs: 11:49
Flights: 273
Period: July 2025 to June 2026

Historical statistics for July 2025 to June 2026, not live status. For today’s F9 1517, check with Frontier Airlines.

F9 1517 lands a B, 3 points 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 about an hour on average. That is a workable record, not a spotless one. That rests on 273 flights, with a median arrival 13 minutes early.

On time

80.1%

Arrivals under 15 minutes late, of 266 completed flights

Avg delay

63 min

Across delayed arrivals only, not all flights

Cancelled

2.56%

National rate is 1.81%

1 hour+ late

6.8%

National rate is 8.1%

These figures cover 273 flights between July 2025 and June 2026. The median arrival is 13 minutes early, which is the part an average hides: most flights here are fine, and the on-time rate is decided by a tail of badly late ones. On-time means under 15 minutes late, the DOT's own threshold.

Schedule

When F9 1517 flies

F9 1517 flies PHL to RDU without a single fixed slot. Its most common scheduled departure was 11:49, used on 49 of 273 flights, with 12:01 (33 flights) next. Carriers retime flights through the season, so the rates here blend slightly different positions in the aircraft's day.

Departs 11:4949 flights17.9%
Departs 12:0133 flights12.1%

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 11:49 departure sits in the 11am–2pm window. Across every US flight scheduled in that window the on-time rate is 78.8%, and F9 1517 runs level with that at 80.1%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.

Against the route

F9 1517 next to PHL to RDU

Every carrier on PHL to RDU combined arrived on time 75.0% of the time across 2,560 flights, so F9 1517 is 5 points ahead of it. Frontier flew 585 flights on the same city pair under all its flight numbers, including this one, and those ran 81.2% on time. Across its whole network Frontier Airlines managed 73.2%, which this flight beats by 7 points.

F9 1517 against its route and carrier
Compared with	Flights	On time	Avg delay	Cancelled	Grade
F9 1517thin sample	273	80.1%	63 min	2.56%	B
All Frontier Airlines on PHL–RDU	585	81.2%	68 min	2.56%	B
All carriers on PHL–RDU	2,560	75.0%	78 min	2.77%	B
Frontier Airlines, whole network	205,332	73.2%	84 min	1.85%	C

Across the year

F9 1517 quarter by quarter

Quarter by quarter F9 1517 held fairly steady: 83.7% in Jul–Sep 2025, 75.0% in Oct–Dec 2025, 80.0% in Jan–Mar 2026 and 80.3% in Apr–Jun 2026. A spread of 9 points is about what a sample of this size moves on its own, so the annual figure is a fair summary.

Jul–Sep 202592 flights83.7%
Oct–Dec 202568 flights75.0%
Jan–Mar 202650 flights80.0%
Apr–Jun 202663 flights80.3%

Scale runs 65% to 90%. Rows with fewer than 30 flights show a dash.

By weekday, F9 1517 did best on Wednesday at 90.6% on time and worst on Monday at 69.2%. Each day rests on about 39 flights, so a gap of 21 points is worth noticing but could still narrow in another year.

Delay causes

Why F9 1517 runs late

One category carries most of the weight here. Late-arriving aircraft accounts for 58% of the 3,356 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.

Late-arriving aircraft
58%
Carrier
34%
National Airspace System
8%

58% 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 3,356 reported delay minutes here, that single category outweighs weather by 58 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 3,356 delay minutes reported on F9 1517.

Cancellations run at 2.56%, against 1.81% nationally. That is about one flight in 40 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

6.8% of arrivals land an hour or more late, close to the national 8.1%. That is the figure that decides a connection, and it says a 60 to 75 minute layover is reasonable here while anything under 45 minutes is a bet. Most delays on this route last about an hour, which a normal layover absorbs.

Every one of the 273 flights under F9 1517 in the data flew PHL to RDU. The number was not reused on any other city pair, which makes this a clean record of one route.

One caution: this is a thin sample. 273 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 F9 1517

For a booking, the cancellation rate is the figure to plan around on F9 1517: 2.56% of its 273 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.

Where to go next

A flight number here means Frontier 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.

Key figures