No delays reported for UA 2021 (IAD → SJU) as of 6:47 PM ET. It arrived on time 75% of the time in June-August 2026. When it was late, the average delay was 45 minutes. None were cancelled. Right now there are no reported delays at IAD, SJU.
Looks on time
Next leg IAD → SJU, scheduled 8:34 AM local time. No delays at IAD right now.
Cancellation risk: Low 0% of its flights were cancelled in June-August 2026.
Estimate from the schedule, live position and airport conditions, if this flight operates today. Check United for official times.
Before you fly
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| IAD → SJU Washington, DC to San Juan, PR | 8:34 AM → 12:34 PM | 75% |
Local times. Schedules change; check your booking.
How reliable is UA 2021?
| Arrived on time (within 15 min) | 75% |
| Average delay when late | 45 min |
| Cancelled | 0% |
| Diverted | 0% |
| Flights tracked | 92 |
Best and worst days to fly UA 2021
UA 2021 was most reliable on Wednesdays (92% on time) and least reliable on Fridays (54%).
| Monday | |
| Tuesday | |
| Wednesday | |
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Why it runs late
| Late-arriving plane | |
| Airline (crew, maintenance) | |
| Air traffic system | |
| Extreme weather |
Share of delay minutes by cause, as reported by United to the Department of Transportation.
Other flights IAD → SJU
All flights on this route, ranked
Live status at its airports
We show airport-wide airport status, not this flight's gate or live position. For that, check the United app.
United delays and what you're owed · Airline phone numbers
About this data
On-time history: U.S. Bureau of Transportation Statistics, Reporting Carrier On-Time Performance, June-August 2026. Live conditions: live airport status. "On time" means arriving within 15 minutes of schedule.
Common questions
Is UA 2021 delayed today?
Right now there are no reported delays at IAD, SJU. Checked 6:47 PM ET. For this flight's gate and exact status, check the United app.
Is UA 2021 usually on time?
UA 2021 arrived within 15 minutes of schedule 75% of the time in June-August 2026, with an average delay of 45 minutes when late.
How often is UA 2021 cancelled?
0% of UA 2021 flights were cancelled in June-August 2026.