Apparatus

Try JFK, AAL1290, BAW, or N225AN.

flight_takeoff Flight

UAL3938

Operated by United Airlines

Live map

Live map filtered to UAL3938. Shown when the flight is currently airborne.

Route airports View route page →

Departure

SEA KSEA VFR

Seattle–Tacoma International Airport

Seattle, US

Local time
01:17 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
433 ft
Coordinates
47.4479, -122.3103

cloud Weather

Wind
190° / 3 kt
Visibility
10 SM
Ceiling
FEW 7,000 ft, BKN 23,000 ft
Temp / Dew
16°C / 12°C
Altimeter
30.08 inHg

Obs: 2026-08-28T07:53:00.000Z

Raw METAR / TAF 
METAR KSEA 280753Z 19003KT 10SM FEW070 BKN230 16/12 A3008 RMK AO2 SLP191 T01560122 402330150

TAF KSEA 280520Z 2806/2912 21006KT P6SM SCT040 BKN080 FM281000 19005KT P6SM BKN022 FM281300 18003KT P6SM OVC012 FM281900 22005KT P6SM BKN025 OVC050 FM282100 24006KT P6SM BKN050 FM290200 30006KT P6SM BKN050 FM290800 19007KT P6SM -SHRA OVC025

flight Live Traffic

flight_takeoff 594 Departures
flight_land 597 Arrivals

Arrival

SFO KSFO VFR

San Francisco International Airport

San Francisco, US

Local time
01:17 PDT
Timezone
America/Los_Angeles
Type
Large Airport
Elevation
13 ft
Coordinates
37.6198, -122.3748

cloud Weather

Wind
300° / 13 kt
Visibility
10 SM
Ceiling
FEW 400 ft, BKN 20,000 ft
Temp / Dew
16°C / 13°C
Altimeter
29.95 inHg

Obs: 2026-08-28T07:56:00.000Z

Raw METAR / TAF 
METAR KSFO 280756Z 30013KT 10SM FEW004 BKN200 16/13 A2995 RMK AO2 SLP142 T01560133 402280144 $

TAF KSFO 280520Z 2806/2912 29008KT P6SM BKN150 FM281100 30008KT P6SM VCSH BKN050 OVC100 FM282000 29014KT P6SM VCSH BKN050 OVC100 FM290300 29010KT P6SM SCT010 BKN120 FM291000 29007KT P6SM BKN010

flight Live Traffic

flight_takeoff 175 Departures
flight_land 106 Arrivals

Recent history last 30

DateAircraftRouteTakeoffLandingDurationDep ΔArr Δ
2026-07-25 ABB089 SEA → SFO Jul 25, 12:25 UTCJul 25, 14:45 UTC2h 20m - -
2026-07-25 ABB089 SEA → SFO Jul 25, 12:32 UTCJul 25, 14:45 UTC2h 13m +32m -1m
2026-07-22 A94B50 SEA → SFO Jul 22, 17:10 UTCJul 22, 21:20 UTC4h 10m - -
2026-07-20 A5CC15 SEA → SFO Jul 20, 01:40 UTCJul 20, 02:30 UTC50m - -
2026-07-20 A5CC15 SEA → SFO Jul 20, 01:43 UTCJul 20, 02:25 UTC42m +13m -9m
2026-07-18 A445AB TPA → AUS Jul 18, 13:20 UTCJul 18, 15:35 UTC2h 15m - -
2026-07-16 A0B7B6 - Jul 16, 21:40 UTCJul 16, 22:00 UTC20m - -
2026-07-16 A0B7B6 LAS → ORD Jul 16, 18:25 UTCJul 16, 22:00 UTC3h 35m - -
2026-07-16 A0B7B6 LAS → ORD Jul 16, 18:16 UTCJul 16, 21:23 UTC3h 7m +91m -7m
2026-07-14 A12F52 - Jul 14, 20:35 UTCJul 14, 23:15 UTC2h 39m - -
2026-07-11 A254FF - Jul 11, 16:10 UTCJul 11, 18:05 UTC1h 55m - -
2026-07-11 A254FF LAX → DEN Jul 11, 15:59 UTCJul 11, 18:04 UTC2h 5m +119m -1m
2026-07-09 A3CF4F SEA → SFO Jul 9, 11:30 UTCJul 9, 12:35 UTC1h 5m - -
2026-06-29 A89D59 SEA → SFO Jun 29, 21:19 UTCJun 30, 00:20 UTC3h 0m - -
2026-06-27 AC2706 SEA → SFO Jun 27, 13:00 UTCJun 27, 13:49 UTC50m - -
2026-06-24 A6246E SEA → SFO Jun 24, 05:49 UTCJun 24, 06:45 UTC55m - -
2026-06-24 A6246E SEA → SFO Jun 24, 05:48 UTCJun 24, 06:40 UTC52m +18m +4m
2026-06-21 A8D76B SEA → SFO Jun 21, 18:54 UTCJun 21, 19:39 UTC45m - -
2026-06-15 AA6BA4 SEA → SFO Jun 15, 15:50 UTCJun 16, 05:59 UTC14h 10m - -
2026-06-14 AB6542 SEA → SFO Jun 14, 13:30 UTCJun 14, 17:15 UTC3h 45m - -
2026-06-12 A2A2E3 SEA → SFO Jun 12, 20:00 UTCJun 12, 20:05 UTC5m - -
2026-06-12 A2A2E3 SEA → SFO Jun 12, 19:25 UTCJun 12, 20:05 UTC40m - -
2026-06-12 A2A2E3 SEA → SFO Jun 12, 18:41 UTCJun 12, 19:44 UTC1h 3m +41m +4m
2026-06-06 A76F6C SEA → SFO Jun 6, 03:50 UTCJun 6, 07:35 UTC3h 45m - -
2026-06-02 A5ADF1 SEA → SFO Jun 2, 18:45 UTCJun 2, 21:00 UTC2h 15m - -
2026-05-31 AA56B5 SEA → SFO May 31, 11:55 UTCMay 31, 14:30 UTC2h 35m - -
2026-05-31 AA56B5 SEA → SFO May 31, 11:45 UTCMay 31, 14:16 UTC2h 31m +45m +3m
2026-05-23 A56A18 SEA → SFO May 23, 05:40 UTCMay 23, 07:50 UTC2h 10m - -
2026-05-19 A44187 SEA → SFO May 19, 13:25 UTCMay 19, 18:20 UTC4h 55m - -
2026-05-18 A0A900 SEA → SFO May 18, 09:50 UTCMay 18, 16:15 UTC6h 25m - -

Performance history

Flights tracked
42 showing last 30
Avg arrival delay
-1m
On-time arrival
100% 100% on time
Aircraft used
21

Monthly activity 4 months

Month Flights tracked
July 2026 13
June 2026 12
May 2026 10
April 2026 7

UAL3938 frequently asked

Where does flight UAL3938 fly?
UAL3938 (United Airlines) flies from SEA to SFO. View the full route page.
How long is flight UAL3938?
Based on observed flights, UAL3938 takes on average 2h 36m from takeoff to landing.
How often does UAL3938 fly?
UAL3938 has been observed flying several times a week in our tracking data. We've recorded 42 flights under this callsign.
Is flight UAL3938 usually on time?
Across recent flights, UAL3938 arrives 1 minutes early on average. 100% of flights arrive within 15 minutes of schedule.
What aircraft operates flight UAL3938?
UAL3938 has been operated by 21 different aircraft in our records. Tail numbers are listed in the recent history below.
Can I track UAL3938 live?
Yes. When UAL3938 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.