Return to field — UAL1931

KSFO · 28L

2026-04-17 15:47 UTC· KSFO → KSFO· UNITED AIRLINES INC· B738

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UAL1931 (United Airlines) was operating from KSFO to KSFO (San Francisco International Airport) on 2026-04-17. SkyMeter detected a return to field at San Francisco International Airport (KSFO) on runway 28L at 15:47 UTC. Peak cruise altitude FL388, turnaround area near Malibu, US. METAR at the time reported 0 kt wind, 16,093 m visibility. Detection algorithm and known limitations: see SkyMeter methodology.

Active FAA TFR during this flight

Source: FAA TFR archive (hourly snapshot)
  • SECURITY5/0601 2025-11-30 19:00Z – 2026-05-31 18:59Z SFC–400 ft

    Los Angeles, CA, Sunday, November 30, 2025 through Sunday, May 31, 2026 Local

    View FAA NOTAM →
  • SECURITY6/0091 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

    Coyote Wells, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

    View FAA NOTAM →
  • SECURITY6/0092 2026-01-04 00:01Z – 2026-07-04 23:59Z SFC–500 ft

    CALEXICO, CA, Saturday, January 3, 2026 through Saturday, July 4, 2026 Local

    View FAA NOTAM →
  • SECURITY6/4160 2026-02-14 08:00Z – 2026-08-15 06:59Z SFC–400 ft

    Chula Vista, CA, Saturday, February 14, 2026 through Friday, August 14, 2026 Local

    View FAA NOTAM →

SkyMeter cross-referenced this flight against FAA-published TFRs that were active during its window and within its geographic bounding box. Overlap doesn't necessarily mean violation — the aircraft may have been outside the TFR’s precise polygon or flying under air-traffic-control coordination.

Pilot review data

  • Runway 28L
  • 38882 ft AGL at event
  • 484 kt ground speed
  • 0 fpm vertical
  • 0 kt wind
  • 0 kt crosswind component
  • 16,093 m visibility
  • KSFO 210556Z 26011KT 10SM FEW004 BKN010 OVC014 15/12 A2995 RMK AO2 SLP143 T01500122 10178 20144 50009

Flight context

  • UAL1931
  • United Airlines
  • B738
  • KSFO → KSFO
  • 2026-04-17 15:47 UTC
  • KSFO runway 28L

All events on this flight

Return to field 15:47:31 UTC · KSFO runway 28L · 38,882 ft AGL · 484 kt GS
Go-around 22:55:41 UTC · KSFO runway 28R · 856 ft AGL · 153 kt GS
Go-around 22:55:41 UTC · KSFO runway 28R · 856 ft AGL · 153 kt GS

Automated analysis. Events shown on this page (such as go-around, unstable approach, or runway events) are heuristic classifications produced by algorithms from publicly broadcast ADS-B data. They are intended to surface flights of interest for further review — they are not findings of fact, and they do not determine pilot fault, regulatory compliance, or the cause of any occurrence. Coverage gaps and sensor noise can affect accuracy. Only the relevant civil aviation authority or accident investigation body can make official determinations. How we detect events · Dispute or correct this data

SkyMeter · trace data observed via ADS-B· KSFO