Chicago (ORD) to Los Angeles (LAX): On-Time Performance
Data through July 2026
The calendar drives reliability on ORD–LAX. May 2025 flights landed on schedule 87% of the time, but June 2026 dropped to 63% — a gap of 24 points. Across the full period the route averages 76% on-time against a national 78%. Morning departures also hold up better than evening ones (84% vs 65%), which matters most in the rough months.
- On-time
- 76%
- arrived <15 min late
- Avg delay
- 18 min
- completed flights
- Cancelled
- 1.2%
- Flights/day
- 19
- last 12 months
- Duration
- 4h 34m
- scheduled
- Distance
- 1,744 mi
Best airline from ORD to LAX
5 airlines flew this route regularly between 2024-07 and 2026-07.
| Airline | On-time | Avg delay | Cancelled | Flights |
|---|---|---|---|---|
| United Airlinesmost reliable | 80% | 15 min | 0.7% | 6,882 |
| Delta Air Lines | 76% | 17 min | 0.0% | 151 |
| Spirit Airlines | 75% | 19 min | 1.5% | 988 |
| American Airlines | 73% | 21 min | 1.6% | 6,266 |
| Frontier Airlines | 66% | 27 min | 4.5% | 290 |
Monthly on-time trend
Best time to fly from ORD to LAX
Aim for departures around 5 a.m. (94% on-time); avoid 10 p.m. departures (56%).
By day of week
| Day | On-time | Avg delay |
|---|---|---|
| Monday | 75% | 21 min |
| Tuesdaybest | 80% | 16 min |
| Wednesday | 77% | 17 min |
| Thursday | 76% | 17 min |
| Friday | 73% | 20 min |
| Saturday | 77% | 17 min |
| Sunday | 74% | 19 min |
What causes delays on this route
Share of total delay minutes by cause, as reported by carriers to the US DOT.
- Late-arriving aircraft43%
- Airline operations34%
- National airspace system17%
- Weather6%
Frequently asked questions
- How often are flights from ORD to LAX delayed?
- 24% of ORD–LAX flights arrived 15 or more minutes late (the US DOT definition of a delay) between 2024-07 and 2026-07. The average arrival delay across completed flights was 18 minutes.
- Which airline is most reliable from ORD to LAX?
- United Airlines has the best on-time record on this route at 80%, based on 6,882 flights. 5 airlines flew ORD–LAX frequently enough to compare in this period.
- What is the best time of day to fly from ORD to LAX?
- Departures around 5 a.m. have the best record (94% on-time), while departures around 10 p.m. have the worst (56%). As on most US routes, delays accumulate through the day, so earlier flights are generally safer.
- How long is the flight from ORD to LAX?
- The scheduled ORD–LAX flight time averages 4h 34m over 1,744 miles. Actual arrival times vary — flights on this route land 15+ minutes late 24% of the time.
- How often are ORD to LAX flights cancelled?
- 1.2% of scheduled flights on this route were cancelled between 2024-07 and 2026-07, at or below the national rate of 1.6%.
- What is the worst month to fly from ORD to LAX?
- June 2026 was the roughest month in this dataset, with only 63% of arrivals on time. The best was May 2025 at 87%. If your dates are flexible, that 24-point gap is worth planning around.
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Based on 14,577 flights, 2024-07–2026-07. Source: US DOT Bureau of Transportation Statistics. Updated 2026-09-28.