About 1 in 7 UA 684 flights from Washington arrived 15+ minutes late, diverted or cancelled over the past year (13%); 0.0% were cancelled. The typical flight landed 9 minutes early.
UA 684: IAD → LAX
Scheduled to leave Washington at 3:15 p.m. local time. Over the past year it arrived on time 87% of the time (134 flights), in line with other UA flights on the route at that hour (86%). Last seen in the data Aug 10, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 20 | 90% |
| Tuesday | 19 | — |
| Wednesday | 19 | — |
| Thursday | 19 | — |
| Friday | 19 | — |
| Saturday | 18 | — |
| Sunday | 20 | 90% |
Why it was late
All flights IAD → LAX · Connecting off UA 684? Check the risk
UA 684: LAX → SEA
Scheduled to leave Los Angeles at 6:58 p.m. local time. Over the past year it arrived on time 84% of the time (122 flights), in line with other UA flights on the route at that hour (87%). Last seen in the data Aug 31, 2026.
Usually United Airlines's last flight of the day from Los Angeles to Seattle (100% of days). United Airlines's last LAX–SEA flight was cancelled 0.0% of the time, against 0.8% for its earlier ones. If it's cancelled, the next United Airlines flight is usually around 11:43 a.m. the next morning.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 23 | 91% |
| Tuesday | 8 | — |
| Wednesday | 11 | — |
| Thursday | 23 | 78% |
| Friday | 22 | 82% |
| Saturday | 13 | — |
| Sunday | 22 | 77% |
Why it was late
All flights LAX → SEA · Connecting off UA 684? Check the risk
Questions
How often is UA 684 from IAD to LAX late?
United Airlines 684 from Washington, DC to Los Angeles, CA arrived 15 or more minutes late, was diverted or was cancelled on 13% of 134 scheduled flights between September 2025 and August 2026. 0.0% were cancelled.
How often is UA 684 from LAX to SEA late?
United Airlines 684 from Los Angeles, CA to Seattle, WA arrived 15 or more minutes late, was diverted or was cancelled on 16% of 122 scheduled flights between September 2025 and August 2026. 0.0% 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.