Carrier route record

F9LGA→DEN

Frontier Airlines · New York to Denver

Flights: 152
Period: July 2025 to June 2026
Share of route: 3%
Carriers: 4

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

Frontier on LGA to DEN draws a D−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is close to two hours behind schedule. Build slack into anything you connect to. That rests on 152 flights. The strongest carrier on the route with a full sample, United Airlines, flew 2,017 at 77.8% on time.

United Airlines is the most reliable of the three carriers covered here at 77.8% on time across 2,017 flights.

On time

64.4%

Arrivals under 15 minutes late, of 146 completed flights

Avg delay

105 min

Across delayed arrivals only, not all flights

Cancelled

3.95%

National rate is 1.81%

Whole route

70.7%

Every carrier on LGA to DEN, 4,672 flights

These figures cover 152 flights between July 2025 and June 2026. Beyond the headline rate, 13.7% of arrivals land a full hour or more behind schedule. That is the number that wrecks a connection, and it is not visible in an on-time percentage alone.

Carrier by carrier

Frontier against every carrier on LGA to DEN

Frontier flew 152 of the 4,672 flights on LGA to DEN, about 3% of it. Its 64.4% on time is 6 points worse than the route as a whole, which runs 70.7%. Ranked by on-time rate it is number three of four carriers on the route, where the range runs from United at 77.8% to Southwest at 61.1%.

The choice of carrier is not cosmetic here. United Airlines arrives on time 77.8% of the time; Southwest Airlines manages 61.1%. Sample sizes sit next to every figure, because a two-point gap across 1,467 flights means less than a ten-point one.

On-time performance by carrier on LGA to DEN
Airline	Flights	On time	Avg delay	Cancelled	Grade
United Airlines	2,017	77.8%	71 min	1.98%	B
Delta Air Lines	1,036	71.3%	71 min	4.15%	C−
Frontier Airlines (this page)thin sample	152	64.4%	105 min	3.95%	D−
Southwest Airlines	1,467	61.1%	63 min	3.27%	D−

Delta Air Lines cancels 4.2% of what it schedules here, the highest in the table. A cancelled flight never appears in an on-time rate, so read that column alongside the punctuality one rather than after it.

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 152 flights.

There are not enough flights in each departure window to split Frontier's LGA to DEN record by time of day without the percentages moving on noise. The headline rate of 64.4% is the reliable figure here.

Across the year

Frontier on LGA to DEN through the year

Jul–Sep 202584 flights60.5%
Oct–Dec 202552 flights65.3%
Jan–Mar 202611 flights—
Apr–Jun 20265 flights—

Scale runs 50% to 70%. 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 64.4% on time across 152 flights.

Split by quarter, Frontier on LGA to DEN logged 84 flights in Jul–Sep 2025, 52 flights in Oct–Dec 2025, 11 flights in Jan–Mar 2026 and 5 flights in Apr–Jun 2026. Fewer than three of those quarters carried the 30 completed flights this site needs before printing a rate, so the 64.4% annual figure is the one to use.

Delay causes

Why Frontier runs late on this route

One category carries most of the weight here. Late-arriving aircraft accounts for 90% of the 5,436 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
90%
Carrier
6%
National Airspace System
4%
Extreme weather
0%

90% 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 5,436 reported delay minutes here, that single category outweighs weather by 90 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 5,436 reported delay minutes.

Cancellations run at 3.95%, against 1.81% 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

For anyone connecting, the number to weigh is not the on-time rate but the tail behind it. 13.7% of arrivals land a full hour or more behind schedule, against 8.1% nationally. A 45-minute layover does not survive that, and no amount of walking quickly changes it. Ninety minutes is the honest minimum here, and two hours if the onward flight is on a separate ticket.

At 1,620 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 61.6% on time across 152 flights, within 3 points 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. 152 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 LGA to DEN

Put together: the delay figures matter less here than the 3.95% cancellation rate. A late arrival costs you close to two hours; a cancelled flight costs you the day. Book the 8pm–5am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 146 completed flights over 12 months sit behind that.

Where to go next

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