Carrier route record
F9ORD→LAX
Frontier Airlines · Chicago to Los Angeles
- Flights
- 228
- Period
- July 2025 to June 2026
- Share of route
- 3%
- Carriers
- 5
Historical statistics for July 2025 to June 2026, not live status. For today’s flights, check with Frontier Airlines.
Frontier on ORD to LAX draws a C−. About one flight in three arrives at least 15 minutes late, and the typical late arrival is a little over an hour behind schedule. Build slack into anything you connect to. That rests on 228 flights. The strongest carrier on the route with a full sample, United Airlines, flew 3,380 at 76.5% on time.
The national on-time rate over the same period is 77.6%, so Frontier on ORD to LAX runs 11 points behind the country as a whole. Across a thousand flights that is about 112 extra late arrivals.
Key figures
On time
66.4%
Arrivals under 15 minutes late, of 217 completed flights
Avg delay
75 min
Across delayed arrivals only, not all flights
Cancelled
4.82%
National rate is 1.81%
Whole route
72.5%
Every carrier on ORD to LAX, 6,961 flights
These figures cover 228 flights between July 2025 and June 2026. Beyond the headline rate, 12.4% 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 ORD to LAX
Frontier flew 228 of the 6,961 flights on ORD to LAX, about 3% of it. Its 66.4% on time is 6 points worse than the route as a whole, which runs 72.5%. Ranked by on-time rate it is number four of five carriers on the route, where the range runs from United at 76.5% to Delta at 60.6%. Two of those carriers flew fewer than 365 flights here, so treat their positions as rough.
The choice of carrier is not cosmetic here. United Airlines arrives on time 76.5% of the time; American Airlines manages 68.6%. Sample sizes sit next to every figure, because a two-point gap across 3,052 flights means less than a ten-point one.
| Airline | Flights | On time | Avg delay | Cancelled | Grade |
|---|---|---|---|---|---|
| United Airlines | 3,380 | 76.5% | 69 min | 0.65% | B+ |
| Spirit Airlinesthin sample | 235 | 74.4% | 88 min | 3.40% | C− |
| American Airlines | 3,052 | 68.6% | 75 min | 2.29% | C |
| Frontier Airlines (this page)thin sample | 228 | 66.4% | 75 min | 4.82% | C− |
| Delta Air Linesthin sample | 66 | 60.6% | 57 min | 0.00% | D+ |
United leads American by 8 points. Real, but small enough that a better departure time on the weaker carrier can outweigh it.
Departure window
When Frontier runs best on this route
Departure time matters more here than the choice of carrier. The gap between the best and worst window is 34 points, against 8 points between the best and worst carrier. Each bar is the on-time rate for flights scheduled inside that window.
- 5am–8am110 flights80.0%
- 8am–11am12 flights—
- 11am–2pm—
- 2pm–5pm—
- 5pm–8pm78 flights45.9%
- 8pm–5am28 flights—
Scale runs 35% to 85%. Rows with fewer than 30 flights show a dash.
The 5pm–8pm window is where this operation falls apart: 45.9% on time, against 80.0% for the 5am–8am slot. By evening the aircraft flying these rotations have absorbed a full day of small delays and there is no slack left to recover in. The 5am–8am window is the busiest, with 110 flights scheduled in it.
Across the year
Frontier on ORD to LAX through the year
- Jul–Sep 202565 flights83.9%
- Oct–Dec 202571 flights68.7%
- Jan–Mar 202631 flights—
- Apr–Jun 202661 flights64.4%
Scale runs 55% to 90%. 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 66.4% on time across 228 flights.
Frontier on ORD to LAX did not run the same all year. Its best quarter was Jul–Sep 2025 at 83.9% on time and its weakest Apr–Jun 2026 at 64.4%, a swing of 20 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.
Across the week, Sunday is the strongest day at 77.8% on time and Monday the weakest at 56.8%. 21 points is a smaller lever than departure hour, but it is free.
Delay causes
Why Frontier runs late on this route
One category carries most of the weight here. National Airspace System accounts for 47% of the 5,479 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.
- 47%National Airspace System
- 28%Late-arriving aircraft
- 22%Carrier
- 3%Extreme weather
47% 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 2,559 minutes out of 5,479, against a national NAS share of 21%. The split is drawn from 5,479 reported delay minutes.
The practical consequence: the 5am–8am departure is the one that starts clean. Its aircraft has no earlier leg to be late from, which is exactly why that window shows 80.0% on time here.
Cancellations run at 4.82%, against 1.81% nationally. That is about one flight in twenty 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. 12.4% 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 1,744 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 is a different operation and performs like one: it runs 61.4% on time across 227 flights, 5 points below this direction. Departure banks, aircraft rotations and the congestion at each end all differ, so scoring the two directions together would average away a real 5 points of difference.
One caution: this is a thin sample. 228 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 ORD to LAX
Put together: the delay figures matter less here than the 4.82% cancellation rate. A late arrival costs you a little over an hour; a cancelled flight costs you the day. Book the 5am–8am departure so there is still a schedule behind you if it goes wrong, and treat a same-day connection as optimistic. 217 completed flights over 12 months sit behind that.
Related
Where to go next
- ORD to LAX, every carrier
- Frontier on LAX to ORD, the return leg
- United Airlines on ORD to LAX76.5%
- Spirit Airlines on ORD to LAX74.4%
- American Airlines on ORD to LAX68.6%
- Frontier Airlines network-wide record
- Chicago O'Hare International (ORD) delay statistics
- Los Angeles International (LAX) delay statistics
- The US routes with the most cancellations
- What a cancellation rate actually tells you (and what it hides)
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.