No delays reported for UA 503 (BOS→ORD, ORD→EGE) as of 6:46 PM ET. It arrived on time 77% of the time in June-August 2026. When it was late, the average delay was 1h 14m. 1% of flights were cancelled. Right now there are no reported delays at BOS, ORD, EGE.
May not fly today
Leg 2 of 2 (ORD → EGE): Should be in the air from ORD, scheduled to land at EGE at 6:05 PM local time. This flight number flew about 6 days a week in June-August 2026, so it may not operate today.
Cancellation risk: Low 1% 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.
What to do now
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Route and schedule
| Leg | Scheduled | On time |
|---|---|---|
| BOS → ORD Boston, MA to Chicago, IL | 10:35 AM → 12:28 PM | 80% |
| ORD → EGE Chicago, IL to Eagle, CO | 4:00 PM → 6:05 PM | 63% |
Local times. Schedules change; check your booking.
How reliable is UA 503?
| Arrived on time (within 15 min) | 77% |
| Average delay when late | 74 min |
| Cancelled | 1% |
| Diverted | 1% |
| Flights tracked | 102 |
Best and worst days to fly UA 503
UA 503 was most reliable on Thursdays (85% on time) and least reliable on Saturdays (69%).
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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 BOS → ORD
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 503 delayed today?
Right now there are no reported delays at BOS, ORD, EGE. Checked 6:46 PM ET. For this flight's gate and exact status, check the United app.
Is UA 503 usually on time?
UA 503 arrived within 15 minutes of schedule 77% of the time in June-August 2026, with an average delay of 74 minutes when late.
How often is UA 503 cancelled?
1% of UA 503 flights were cancelled in June-August 2026.