Route on-time record
LAX to ORD: most on-time flights and the best time to fly
Los Angeles (Los Angeles International Airport) to Chicago (Chicago O'Hare International Airport). 6,981 nonstop flights in Jun 2025 to May 2026, 77% arrived within 15 minutes and 1.7% were cancelled. The most reliable flight number was American 383 at 6:04 AM.
Flying on a specific date? We’ll adjust for the month, the weekday and the forecast.
LAX → ORD
Los Angeles to Chicago: 6,981 nonstop flights a year
On time (12 months)
77%
Cancelled
1.7%
avg delay 20 min
Best time to leave
Before 9 AM
90% on time vs 66% noon to 3 PM
Most reliable airline
United
80% chance on time
Fares open on our travel partner (Aviasales). Pick the flight number you chose here.
Most reliable nonstop flights
Ranked by the chance the flight operates and arrives within 15 minutes of schedule, from Jun 2025 to May 2026 records.
#1 · American 383
6:04 AM → 12:20 PM4h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 6 min
- Arrived on time 92% of the time (205 flights, Jun 2025 to May 2026).
- Never cancelled in 207 scheduled flights.
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Strong track record · 205 flights
Find American 383 fares Opens this date on Aviasales#2 · United 1941
7:00 AM → 1:15 PM4h 15m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 90%
- Cancelled
- 1.0%
- Avg arrival delay
- 8 min
- Arrived on time 90% of the time (197 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Moderate track record · 197 flights
Find United 1941 fares Opens this date on Aviasales#3 · United 353
11:02 PM → 5:15 AM4h 13m nonstop
Local times, typical schedule. Last flown 2026-05-31.
90%
chance on time
- On time (history)
- 97%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 97% of the time (64 flights, Jun 2025 to May 2026).
- Never cancelled in 64 scheduled flights.
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Moderate track record · 64 flights
Find United 353 fares Opens this date on Aviasales#4 · American 1598
8:00 AM → 2:16 PM4h 16m nonstop
Local times, typical schedule. Last flown 2026-05-31.
88%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.6%
- Avg arrival delay
- 11 min
- Arrived on time 92% of the time (177 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
Moderate track record · 177 flights
Find American 1598 fares Opens this date on Aviasales#5 · American 1021
6:19 AM → 12:31 PM4h 12m nonstop
Local times, typical schedule. Last flown 2026-04-06.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 1.3%
- Avg arrival delay
- 7 min
- Arrived on time 88% of the time (151 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
Moderate track record · 151 flights
Find American 1021 fares Opens this date on Aviasales#6 · United 729
12:13 AM → 6:32 AM4h 19m nonstop
Local times, typical schedule. Last flown 2026-05-31. Same departure also flew as United 1643, 2277; its record covers all of them.
87%
chance on time
- On time (history)
- 94%
- Cancelled
- 0.0%
- Avg arrival delay
- 2 min
- Arrived on time 94% of the time (36 flights, Jun 2025 to May 2026).
- Never cancelled in 37 scheduled flights.
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Short track record (36 flights), so its score leans on the airline's record at this hour.
Limited track record · 36 flights
Find United 729 fares Opens this date on Aviasales#7 · United 212
5:15 PM → 11:28 PM4h 13m nonstop
Local times, typical schedule. Last flown 2026-05-20.
87%
chance on time
- On time (history)
- 88%
- Cancelled
- 0.4%
- Avg arrival delay
- 10 min
- Arrived on time 88% of the time (246 flights, Jun 2025 to May 2026).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
Strong track record · 246 flights
Find United 212 fares Opens this date on Aviasales#8 · United 545
11:10 PM → 5:18 AM4h 08m nonstop
Local times, typical schedule. Last flown 2026-03-28.
85%
chance on time
- On time (history)
- 92%
- Cancelled
- 0.0%
- Avg arrival delay
- 4 min
- Arrived on time 92% of the time (24 flights, Jun 2025 to May 2026).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Short track record (24 flights), so its score leans on the airline's record at this hour.
Limited track record · 24 flights
Find United 545 fares Opens this date on Aviasales#9 · United 1946
8:15 AM → 2:27 PM4h 12m nonstop
Local times, typical schedule. Last flown 2026-05-31.
83%
chance on time
- On time (history)
- 84%
- Cancelled
- 1.4%
- Avg arrival delay
- 12 min
- Arrived on time 84% of the time (279 flights, Jun 2025 to May 2026).
- Leaves in this route's most on-time window (Before 9 AM: 90% on time; Noon to 3 PM: 66%).
- Departs outside LAX's trouble window (4 PM to 10 PM, when 53% of its 15 ground stops and delay programs started).
- Lands inside ORD's trouble window: 44% of its 243 ground stops and delay programs started between 2 PM and 8 PM.
Strong track record · 279 flights
Find United 1946 fares Opens this date on Aviasales#10 · United 1707
7:11 PM → 1:18 AM4h 07m nonstop
Local times, typical schedule. Last flown 2026-05-20.
82%
chance on time
- On time (history)
- 89%
- Cancelled
- 0.0%
- Avg arrival delay
- 7 min
- Arrived on time 89% of the time (18 flights, Jun 2025 to May 2026).
- Departs inside LAX's trouble window: 53% of its 15 ground stops and delay programs started between 4 PM and 10 PM.
- Short track record (18 flights), so its score leans on the airline's record at this hour.
Limited track record · 18 flights
Find United 1707 fares Opens this date on Aviasales
Airlines on this route
Season-adjusted chance of operating and arriving on time.
- United Airlines80%
3,394 flights · 81% on time as flown · 0.8% cancel
- Spirit Airlines79%
300 flights · 82% on time as flown · 3.0% cancel
- American Airlines72%
3,039 flights · 73% on time as flown · 2.2% cancel
- Frontier Airlines62%
248 flights · 61% on time as flown · 3.4% cancel
On time by departure time
All airlines, scheduled local departure, Jun 2025 to May 2026.
- Before 9 AM90%
1,674 flights · avg delay 9 min
- 9 AM to noon71%
1,273 flights · avg delay 26 min
- Noon to 3 PM66%
1,084 flights · avg delay 24 min
- 3 to 6 PM73%
1,027 flights · avg delay 28 min
- 6 to 9 PM75%
308 flights · avg delay 26 min
- After 9 PM79%
1,615 flights · avg delay 20 min
Best day: Tuesday (84%). Worst: Sunday (78%).
Smarter routing
Nearby airports that run more on time
ONT → MDW 90% chance on time
Ontario International Airport to Chicago Midway International Airport · 360 flights a year · 62 mi from your airports · yours: 76%
BUR → MDW 87% chance on time
Hollywood Burbank/Bob Hope Airport to Chicago Midway International Airport · 322 flights a year · 33 mi from your airports · yours: 76%
LAX → MDW 80% chance on time
Los Angeles International Airport to Chicago Midway International Airport · 1,355 flights a year · 15 mi from your airports · yours: 76%
On time by month
All airlines, Jun 2023 to May 2026. Several years per month, so one stormy season doesn't define a month. Travel-month estimates use this seasonal pattern.
What delays this route
- Late-arriving aircraft43%
- Airline (crew, maintenance, boarding)31%
- Air traffic control and airport volume24%
- Severe weather2%
Share of delay minutes by the cause airlines report to the US DOT.
Historical odds, not a guarantee. Built from the US DOT Bureau of Transportation Statistics on-time reports (Jun 2025 to May 2026), FAA ground stop and delay program advisories, and 20 years of airport weather observations. Covers US airlines that report to the DOT; schedules are flights operated recently, so confirm times when you book. ATIS Alerts is not affiliated with any airline. Fares are what Aviasales travelers saw in recent searches (USD, one way, 1 adult), not live quotes; the partner site shows the current price. Fare links go to our travel partner and may earn us a commission at no cost to you. Affiliate disclosure
LAX to ORD questions
- What time of day is best to fly LAX to ORD?
- Before 9 AM: 90% of flights arrived on time, against 66% for departures noon to 3 PM. Later flights inherit delays from earlier ones, so the first departures of the day usually run best.
- Which airline is most on time from LAX to ORD?
- United, with a season-adjusted 80% chance of operating and arriving on time over 3,394 flights. The adjustment compares each airline with what the route did in the months it flew, so a carrier that skipped a stormy month gets no free credit.
- What is the worst month for delays on LAX to ORD?
- July (77% on time); the best was February (87%), averaged over Jun 2023 to May 2026.
- Is this a prediction for my flight?
- No. These are historical odds from the US DOT on-time reports, FAA advisories and airport weather records. Check your flight status and the FAA delay board on the day you fly.
More routes from LAX
- ORD to LAX (return)
- LAX to SFO 68%
- LAX to JFK 79%
- LAX to LAS 77%
- LAX to DEN 82%
- LAX to PHX 81%
- LAX to SEA 85%
- LAX to DFW 75%
- LAX to SMF 85%
- LAX to HNL 77%
- LAX to IAH 84%
- LAX to ATL 76%
- LAX to EWR 79%
Live status: FAA delays and ground stops