Apparatus

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flight_takeoff Flight

UAL3866

Operated by United Airlines

Live map

Live map filtered to UAL3866. Shown when the flight is currently airborne.

Route airports View route page →

Departure

RFD KRFD VFR

Chicago Rockford International Airport

Chicago/Rockford, US

Local time
22:25 CDT
Timezone
America/Chicago
Type
Medium Airport
Elevation
742 ft
Coordinates
42.1954, -89.0972

cloud Weather

Wind
50° / 4 kt
Visibility
10 SM
Ceiling
BKN 25,000 ft
Temp / Dew
21°C / 9°C
Altimeter
29.95 inHg

Obs: 2026-05-30T02:54:00.000Z

Raw METAR / TAF 
METAR KRFD 300254Z 05004KT 10SM BKN250 21/09 A2995 RMK AO2 SLP138 T02110094 53001

TAF KRFD 300237Z 3003/3024 VRB04KT P6SM BKN250 FM301400 09012KT P6SM BKN250

flight Live Traffic

flight_takeoff 8 Departures
flight_land 5 Arrivals

Arrival

ORD KORD VFR

Chicago O'Hare International Airport

Chicago, US

Local time
22:25 CDT
Timezone
America/Chicago
Type
Large Airport
Elevation
680 ft
Coordinates
41.9786, -87.9048

cloud Weather

Wind
30° / 10 kt
Visibility
10 SM
Ceiling
BKN 25,000 ft
Temp / Dew
19°C / 11°C
Altimeter
29.96 inHg

Obs: 2026-05-30T02:51:00.000Z

Raw METAR / TAF 
METAR KORD 300251Z 03010KT 10SM BKN250 19/11 A2996 RMK AO2 SLP141 T01940111 53006 $

TAF KORD 300237Z 3003/3106 07004KT P6SM BKN250 FM301400 08014KT P6SM BKN250

flight Live Traffic

flight_takeoff 564 Departures
flight_land 622 Arrivals

Recent history last 3

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-05-25 A0E751 RFD → ORD May 25, 17:10 UTCMay 25, 19:25 UTC2h 15m - -
2026-05-25 A0E751 RFD → ORD May 25, 16:46 UTCMay 25, 18:54 UTC2h 8m +106m +13m
2026-05-21 A1BEFC RFD → ORD May 21, 07:00 UTCMay 21, 07:40 UTC40m - -

Performance history

Flights tracked
3
Avg arrival delay
+13m
On-time arrival
100% 100% on time
Aircraft used
2

Monthly activity 1 month

Month Flights tracked
May 2026 3

UAL3866 frequently asked

Where does flight UAL3866 fly?
UAL3866 (United Airlines) flies from RFD to ORD. View the full route page.
How long is flight UAL3866?
Based on observed flights, UAL3866 takes on average 1h 41m from takeoff to landing.
How often does UAL3866 fly?
UAL3866 has been observed flying occasionally in our tracking data. We've recorded 3 flights under this callsign.
Is flight UAL3866 usually on time?
Across recent flights, UAL3866 arrives with an average 13-minute delay. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3866?
UAL3866 has been operated by 2 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3866 live?
Yes. When UAL3866 is currently airborne, the live tracker map above shows its real-time position from ADS-B broadcasts. If the map is empty, the flight is not currently in the air.