Flight number record
F9 1177
Frontier Airlines · Los Angeles to Seattle
- Route
- LAX → SEA
- Departs
- 15:04
- Flights
- 303
- Period
- September 2025 to August 2026
Historical statistics for September 2025 to August 2026, not live status. For today’s F9 1177, check with Frontier Airlines.
F9 1177 lands a B−, 6 points better than the national rate of 77.3%. About one flight in six arrives 15 minutes late or worse, and those flights are late by about an hour on average. That rests on 303 flights, with a median arrival 12 minutes early.
Set against the rest of the country, F9 1177's record is 6 points better than the US average of 77.3%. That gap is worth roughly 63 fewer late arrivals for every thousand flights.
Key figures
On time
83.6%
Arrivals under 15 minutes late, of 292 completed flights
Avg delay
63 min
Across delayed arrivals only, not all flights
Cancelled
3.30%
National rate is 1.89%
1 hour+ late
5.5%
National rate is 8.3%
These figures cover 303 flights between September 2025 and August 2026. The median arrival is 12 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.
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Schedule
When F9 1177 flies
F9 1177 flies LAX to SEA without a single fixed slot. Its most common scheduled departure was 15:04, used on 58 of 303 flights, with 15:15 (33 flights) next.
- Departs 15:0458 flights19.1%
- Departs 15:1533 flights10.9%
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 15:04 departure sits in the 2pm–5pm window. Across every US flight scheduled in that window the on-time rate is 71.9%, and F9 1177 runs 12 points better at 83.6%. Midday slots inherit some of the morning's delays without yet carrying the full weight of the evening's.
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Against the route
F9 1177 next to LAX to SEA
Every carrier on LAX to SEA combined arrived on time 85.0% of the time across 7,534 flights, so F9 1177 is about level with it. Across its whole network Frontier Airlines managed 72.7%, which this flight beats by 11 points.
| Compared with | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| F9 1177thin sample | 303 | 83.6% | 63 min | 3.30% | B− |
| All Frontier Airlines on LAX–SEAthin sample | 308 | 83.5% | 62 min | 3.25% | B− |
| All carriers on LAX–SEA | 7,534 | 85.0% | 62 min | 0.84% | A+ |
| Frontier Airlines, whole network | 213,022 | 72.7% | 84 min | 2.05% | C |
Across the year
F9 1177 quarter by quarter
F9 1177 did not run the same all year. Its best quarter was Jul–Sep 2026 at 93.4% on time and its weakest Oct–Dec 2025 at 67.7%, a swing of 26 points on roughly 76 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 202517 flights—
- Oct–Dec 202567 flights67.7%
- Jan–Mar 202666 flights88.9%
- Apr–Jun 202691 flights83.3%
- Jul–Sep 202662 flights93.4%
Scale runs 60% to 100%. Rows with fewer than 30 flights show a dash.
By weekday, F9 1177 did best on Wednesday at 90.0% on time and worst on Tuesday at 77.4%. Each day rests on about 43 flights, so a gap of 13 points is worth noticing but could still narrow in another year.
Arrival by arrival
How late F9 1177 runs when it is late
F9 1177 often beats the schedule: 127 of 292 completed flights, 43%, arrived 15 minutes or more early. The 48 late arrivals split 17 under half an hour, 15 between 30 and 60 minutes, and 16 an hour or more.
- 15+ min early127 flights43.5%
- Within 15 min117 flights40.1%
- 15–29 min late17 flights5.8%
- 30–59 min late15 flights5.1%
- 1–2 hours late10 flights3.4%
- 2+ hours late6 flights2.1%
Scale runs 0% to 100%.
Share of 292 completed flights by arrival against schedule.
A late pushback is often recovered here: of 58 departures that left 15 minutes late or more, 19 still arrived on time. 9 flights left on time and still arrived late.
The worst days
Worst days for F9 1177
The latest arrival of the period was on 15 December 2025, 5 hours 30 minutes behind schedule; most of its delay minutes were filed as carrier-caused (crew, maintenance, fuelling, baggage). On three of the five worst days the largest share was filed as a late-arriving aircraft.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 15 December 2025 | 5 hours 30 minutes | Carrier |
| 15 October 2025 | 3 hours 48 minutes | Late-arriving aircraft |
| 25 June 2026 | 3 hours 30 minutes | Carrier |
| 8 August 2026 | 2 hours 19 minutes | Late-arriving aircraft |
| 29 March 2026 | 2 hours 12 minutes | Late-arriving aircraft |
Delay causes
Why F9 1177 runs late
Late-arriving aircraft accounts for 62% of the 3,038 delay minutes carriers reported here, and the remaining four split what is left.
- 62%Late-arriving aircraft
- 26%Carrier
- 11%National Airspace System
- 1%Extreme weather
62% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 3,038 reported delay minutes here, that single category outweighs weather by 45 to one. The split is drawn from 3,038 delay minutes reported on F9 1177.
Cancellations run at 3.30%, 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
5.5% 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 about an hour, which a normal layover absorbs.
The 954 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.
Every one of the 303 flights under F9 1177 in the data flew LAX to SEA. 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. 303 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 1177
For a booking, the cancellation rate is the figure to plan around on F9 1177: 3.30% of its 303 scheduled flights did not operate. A late arrival costs about an hour, but a cancellation costs the day, so leave a later option open.
Related
Where to go next
- LAX to SEA, every carrier and departure
- SEA to LAX, the return direction
- Delta Air Lines 2606 on the same route83.1%
- Delta Air Lines 2980 on the same route92.2%
- Delta Air Lines 2640 on the same route81.8%
- Delta Air Lines 1714 on the same route91.7%
- Delta Air Lines 1045 on the same route86.9%
- Alaska Airlines 1305 on the same route73.3%
- Los Angeles International (LAX) delay statistics
- Seattle-Tacoma International (SEA) delay statistics
- Frontier Airlines on-time record
- Every Frontier Airlines flight number with a record
- The most and least reliable flight numbers in the US
- Why the first flight of the morning is statistically safest
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, September 2025 to August 2026. Last updated ; recomputed monthly. How this data is collected.