About 5 in 10 UA 661 flights from Newark arrived 15+ minutes late, diverted or cancelled over the past year (55%); 4.3% were cancelled. The typical flight landed 16 minutes late.
UA 661: EWR → ORD
Scheduled to leave Newark at 4:45 p.m. local time. Over the past year it arrived on time 45% of the time (346 flights), in line with other UA flights on the route at that hour (46%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 49 | 33% |
| Tuesday | 49 | 53% |
| Wednesday | 49 | 37% |
| Thursday | 49 | 41% |
| Friday | 50 | 48% |
| Saturday | 50 | 58% |
| Sunday | 50 | 48% |
Why it was late
All flights EWR → ORD · Connecting off UA 661? Check the risk
UA 661: ORD → LAX
Scheduled to leave Chicago at 9:15 p.m. local time. Over the past year it arrived on time 63% of the time (199 flights), in line with other UA flights on the route at that hour (65%). Last seen in the data Aug 10, 2026.
Usually United Airlines's last flight of the day from Chicago to Los Angeles (70% of days). United Airlines's last ORD–LAX flight was cancelled 0.8% of the time, against 0.6% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 6:00 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 36 | 69% |
| Tuesday | 24 | 71% |
| Wednesday | 24 | 54% |
| Thursday | 34 | 62% |
| Friday | 36 | 58% |
| Saturday | 18 | — |
| Sunday | 27 | 63% |
Why it was late
All flights ORD → LAX · Connecting off UA 661? Check the risk
UA 661: SNA → EWR
Scheduled to leave Santa Ana at 6:45 a.m. local time. Over the past year it arrived on time 85% of the time (178 flights), in line with other UA flights on the route at that hour (83%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 29 | 72% |
| Tuesday | 28 | 82% |
| Wednesday | 28 | 89% |
| Thursday | 29 | 86% |
| Friday | 29 | 86% |
| Saturday | 29 | 93% |
| Sunday | 6 | — |
Why it was late
All flights SNA → EWR · Connecting off UA 661? Check the risk
Questions
How often is UA 661 from EWR to ORD late?
United Airlines 661 from Newark, NJ to Chicago, IL arrived 15 or more minutes late, was diverted or was cancelled on 55% of 346 scheduled flights between September 2025 and August 2026. 4.3% were cancelled.
How often is UA 661 from ORD to LAX late?
United Airlines 661 from Chicago, IL to Los Angeles, CA arrived 15 or more minutes late, was diverted or was cancelled on 37% of 199 scheduled flights between September 2025 and August 2026. 0.5% were cancelled.
How often is UA 661 from SNA to EWR late?
United Airlines 661 from Santa Ana, CA to Newark, NJ arrived 15 or more minutes late, was diverted or was cancelled on 15% of 178 scheduled flights between September 2025 and August 2026. 1.7% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check United Airlines for today's flight. Method.