Carrier route record
F9IAD→FLL
Frontier Airlines · Washington to Fort Lauderdale
- Flights
- 103
- Period
- September 2025 to August 2026
- Share of route
- 13%
- Carriers
- 2
Historical statistics for September 2025 to August 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on IAD to FLL earns an F−, which is as low as this site's scale goes for a reason. Only 47.5% of flights arrive inside the 15-minute window, 30 points worse than the national rate of 77.3%. Late arrivals average an hour and a half. Treat any tight connection here as a coin flip. That rests on 103 flights, with a median arrival 15 minutes late.
The national on-time rate over the same period is 77.3%, so Frontier on IAD to FLL runs 30 points behind the country as a whole. Across a thousand flights that is about 298 extra late arrivals.
Key figures
On time
47.5%
Arrivals under 15 minutes late, of 99 completed flights
Avg delay
95 min
Across delayed arrivals only, not all flights
Cancelled
3.88%
National rate is 1.89%
Whole route
79.0%
Every carrier on IAD to FLL, 802 flights
These figures cover 103 flights between September 2025 and August 2026. Beyond the headline rate, 26.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally.
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Carrier by carrier
Frontier against every carrier on IAD to FLL
Frontier flew 103 of the 802 flights on IAD to FLL, about 13% of it. Its 47.5% on time is 32 points worse than the route as a whole, which runs 79.0%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 83.5% to Frontier at 47.5%.
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 |
|---|---|---|---|---|---|
| United Airlines | 699 | 83.5% | 71 min | 0.57% | B+ |
| Frontier Airlines (this page)thin sample | 103 | 47.5% | 95 min | 3.88% | F− |
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.
Departure window
When Frontier runs best on this route
Departure time is the single lever a traveller controls, and it moves the odds more than most people expect. Each bar below is the on-time rate for flights scheduled to leave inside that window, across 103 flights.
There are not enough flights in each departure window to split Frontier's IAD to FLL record by time of day without the percentages moving on noise. The headline rate of 47.5% is the reliable figure here.
Across the year
Frontier on IAD to FLL through the year
- Apr–Jun 202641 flights56.1%
- Jul–Sep 202662 flights41.4%
Scale runs 35% to 60%.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 47.5% on time across 103 flights.
Split by quarter, Frontier on IAD to FLL logged 41 flights in Apr–Jun 2026 and 62 flights in Jul–Sep 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 47.5% annual figure is the one to use.
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 66% of the 4,949 delay minutes carriers reported here, and the remaining four split what is left.
- 66%Late-arriving aircraft
- 22%National Airspace System
- 10%Carrier
- 1%Extreme weather
66% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 4,949 reported delay minutes here, that single category outweighs weather by 45 to one. The split is drawn from 4,949 reported delay minutes.
Cancellations run at 3.88%, against 1.89% 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 stage length
What a delay here costs
26.3% of arrivals land a full hour or more behind schedule, against 8.3% nationally. Ninety minutes is the honest minimum for a connection here, and two hours if the onward flight is on a separate ticket.
The 901 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 return leg runs 48.4% on time across 103 flights, within about a point 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. 103 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 Frontier on IAD to FLL
Put together: the delay figures matter less here than the 3.88% cancellation rate. A late arrival costs you an hour and a half; a cancelled flight costs you the day. Book the 5pm–8pm departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 99 completed flights over 12 months sit behind that.
Related
Where to go next
- IAD to FLL, every carrier
- Frontier on FLL to IAD, the return leg
- United Airlines on IAD to FLL83.5%
- Frontier Airlines network-wide record
- Washington Dulles International (IAD) delay statistics
- Fort Lauderdale-Hollywood International (FLL) delay statistics
- The US routes with the most cancellations
- Why the first flight of the morning is statistically safest
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.