Carrier route record
F9IAD→LAS
Frontier Airlines · Washington to Las Vegas
- Flights
- 104
- Period
- September 2025 to August 2026
- Share of route
- 10%
- 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 LAS draws a D+. Roughly one flight in three arrives at least 15 minutes late, and the typical late arrival is roughly 50 minutes behind schedule. Build slack into anything you connect to. That rests on 104 flights, with a median arrival 4 minutes late.
The national on-time rate over the same period is 77.3%, so Frontier on IAD to LAS runs 17 points behind the country as a whole. Across a thousand flights that is about 171 extra late arrivals.
Key figures
On time
60.2%
Arrivals under 15 minutes late, of 103 completed flights
Avg delay
48 min
Across delayed arrivals only, not all flights
Cancelled
0.96%
National rate is 1.89%
Whole route
85.3%
Every carrier on IAD to LAS, 1,069 flights
These figures cover 104 flights between September 2025 and August 2026. On-time means an arrival less than 15 minutes after the scheduled gate time, the same threshold the Department of Transportation uses in its own reports. Cancelled and diverted flights are excluded from the on-time rate and counted separately, which is why the cancellation column matters on its own.
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Carrier by carrier
Frontier against every carrier on IAD to LAS
Frontier flew 104 of the 1,069 flights on IAD to LAS, about 10% of it. Its 60.2% on time is 25 points worse than the route as a whole, which runs 85.3%. Ranked by on-time rate it is last of two carriers on the route, where the range runs from United at 88.0% to Frontier at 60.2%.
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 | 965 | 88.0% | 80 min | 0.52% | A+ |
| Frontier Airlines (this page)thin sample | 104 | 60.2% | 48 min | 0.96% | D+ |
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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 104 flights.
There are not enough flights in each departure window to split Frontier's IAD to LAS record by time of day without the percentages moving on noise. The headline rate of 60.2% is the reliable figure here.
Across the year
Frontier on IAD to LAS through the year
- Jul–Sep 20251 flights—
- Apr–Jun 202641 flights61.0%
- Jul–Sep 202662 flights60.7%
Scale runs 50% to 65%. Rows with fewer than 30 flights show a dash.
Monthly volumes are too low here to break the year into twelve reliable readings. What the twelve-month total says is 60.2% on time across 104 flights.
Split by quarter, Frontier on IAD to LAS logged 1 flights in Jul–Sep 2025, 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 60.2% annual figure is the one to use.
Arrival by arrival
How late Frontier on IAD to LAS runs when it is late
Frontier on IAD to LAS often beats the schedule: 26 of 103 completed flights, 25%, arrived 15 minutes or more early. The 41 late arrivals split 14 under half an hour, 19 between 30 and 60 minutes, and 8 an hour or more.
- 15+ min early26 flights25.2%
- Within 15 min36 flights35.0%
- 15–29 min late14 flights13.6%
- 30–59 min late19 flights18.4%
- 1–2 hours late5 flights4.9%
- 2+ hours late3 flights2.9%
Scale runs 0% to 100%.
Share of 103 completed flights by arrival against schedule.
7 of 39 late departures made up the time and arrived on time, 18% of them. In the other direction, 9 flights left on time yet arrived 15 minutes late or more, so that delay built up after pushback: in the air, in a holding pattern or on the ground at LAS.
The worst days
Worst days for Frontier on IAD to LAS
The latest arrival of the period was on 19 June 2026, 4 hours 33 minutes behind schedule; most of its delay minutes were filed as a late-arriving aircraft. The same cause led on four of the five worst days.
| Date | Arrived late by | Largest filed cause |
|---|---|---|
| 19 June 2026 | 4 hours 33 minutes | Late-arriving aircraft |
| 4 August 2026 | 2 hours 57 minutes | Carrier |
| 18 August 2026 | 2 hours 12 minutes | Late-arriving aircraft |
| 2 July 2026 | 1 hour 12 minutes | Late-arriving aircraft |
| 13 July 2026 | 1 hour 5 minutes | Late-arriving aircraft |
Delay causes
Why Frontier runs late on this route
Late-arriving aircraft accounts for 50% of the 1,966 delay minutes carriers reported here, and the remaining four split what is left.
- 50%Late-arriving aircraft
- 32%Carrier
- 17%National Airspace System
50% of delay minutes trace back to a late-arriving aircraft, meaning the plane was already behind before it got here. Across 1,966 reported delay minutes here, that single category outweighs weather by 50 to one. The split is drawn from 1,966 reported delay minutes.
The practical consequence: the 8am–11am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 60.2% on time here.
Cancellations sit at 0.96% against a national 1.89%, which is ordinary. Diversions add another 0.00%.
Connections and stage length
What a delay here costs
7.8% 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 roughly 50 minutes, which a normal layover absorbs.
At 2,065 miles this is transcontinental flying, and long routes get a quiet structural advantage. Scheduled block time on a flight this length carries more padding in absolute minutes, so a twenty-minute late departure often still becomes an on-time arrival. Read the on-time rate here as slightly flattering next to a short-haul route with the same operational quality.
The return leg runs 59.8% on time across 103 flights, within half 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. 104 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 LAS
Put together: treat all of this as provisional. 104 flights over twelve months is enough to clear this site's floor and not enough to be confident to better than a couple of points. The 60.2% headline is the most reliable number on the page; the hour and month splits below it are built on a few dozen flights each. 103 completed flights over 12 months sit behind that.
Related
Where to go next
- IAD to LAS, every carrier
- Frontier on LAS to IAD, the return leg
- United Airlines on IAD to LAS88.0%
- Frontier Airlines network-wide record
- Washington Dulles International (IAD) delay statistics
- Harry Reid International (LAS) delay statistics
- Why the first flight of the morning is statistically safest
- How to read this site: grades, sample sizes, and honest caveats
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.