Carrier route record

F9FLL→IAD

Frontier Airlines · Fort Lauderdale to Washington

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 FLL to IAD earns an F−, which is as low as this site's scale goes for a reason. Only 48.4% of flights arrive inside the 15-minute window, 29 points worse than the national rate of 77.3%. Late arrivals average close to two hours. Treat any tight connection here as a coin flip. That rests on 103 flights, with a median arrival 18 minutes late.

The national on-time rate over the same period is 77.3%, so Frontier on FLL to IAD runs 29 points behind the country as a whole. Across a thousand flights that is about 289 extra late arrivals.

On time

48.4%

Arrivals under 15 minutes late, of 95 completed flights

Avg delay

103 min

Across delayed arrivals only, not all flights

Cancelled

6.80%

National rate is 1.89%

Whole route

81.4%

Every carrier on FLL to IAD, 803 flights

These figures cover 103 flights between September 2025 and August 2026. Beyond the headline rate, 24.2% 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 FLL to IAD

Frontier flew 103 of the 803 flights on FLL to IAD, about 13% of it. Its 48.4% on time is 33 points worse than the route as a whole, which runs 81.4%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 85.9% to Frontier at 48.4%.

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.

On-time performance by carrier on FLL to IAD
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	700	85.9%	79 min	0.57%	A+
Frontier Airlines (this page)thin sample	103	48.4%	103 min	6.80%	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 FLL to IAD record by time of day without the percentages moving on noise. The headline rate of 48.4% is the reliable figure here.

Across the year

Frontier on FLL to IAD through the year

Apr–Jun 202641 flights76.3%
Jul–Sep 202662 flights29.8%

Scale runs 20% to 80%.

Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 48.4% on time across 103 flights.

Split by quarter, Frontier on FLL to IAD 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 48.4% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

Late-arriving aircraft accounts for 54% of the 5,063 delay minutes carriers reported here, and the remaining four split what is left.

Late-arriving aircraft
54%
National Airspace System
34%
Carrier
11%
Extreme weather
2%

54% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 5,063 reported delay minutes here, that single category outweighs weather by 25 to one. The split is drawn from 5,063 reported delay minutes.

34% of delay minutes are charged to the National Airspace System: air traffic volume, runway configuration, ground stops. No carrier can price its way out of that, which is why airport choice moves the number here more than carrier choice does. That is 1,702 minutes out of 5,063, against a national NAS share of 21%.

Cancellations run at 6.80%, against 1.89% nationally. That is about one flight in fifteen 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

24.2% 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 47.5% 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 FLL to IAD

Put together: the delay figures matter less here than the 6.80% cancellation rate. A late arrival costs you close to two hours; 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. 95 completed flights over 12 months sit behind that.

Where to go next

Source: US DOT Bureau of Transportation Statistics, on-time performance data, September 2025 to August 2026. Last updated 22 October 2026; recomputed monthly. How this data is collected.

Key figures