Tracked flight number

UA878

UAL878United AirlinesPhoto aircraft N2138UAug 20 – Sep 24, 2026

Data through Sep 24, 2026 UTC

Analysis window

Aug 20 – Sep 24, 2026

Every derived statistic, daily trend, route, tail number assignment, flight observation, and mapped path below uses this flight-date window.

Global rankings

Among tracked flight numbers · Aug 20 – Sep 24, 2026

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Tracked flights

#14,710of 163,734 · tied

Tracked distance

#107of 163,734

242,983 mi

Observed time

#181of 163,734

413.6 hr

Route breadth

#13,941of 163,734 · tied

Active aircraft

#25,396of 163,734 · tied

Active days

#7,958of 163,734 · tied

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Tracked flights34

34 active days

Tracked distance242,983 mi

7,147 mi avg per flight

Observed time413 hr 36 min

12 hr 10 min average

Tracking Confidence100.0%

Average across flights included in analytics

Named routes2

2 aircraft types

Average mid-flight altitude9,995 m

Average mid-flight speed970 km/h

Tracked activity

Aug 20 – Sep 24, 2026 · 34 active days

Flights34

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Observed route footprint

Routes tracked as UA878

Directional airport pairings in Aug 20 – Sep 24, 2026.

2 routes shown

Route	Flights	Active days	Tail numbers	Tracked distance	Observed	First observed	Last observed
HKG → SFO	33	33	0	237,150 mi	403 hr 9 min	Aug 20, 2026, 2:39 PM UTC	Sep 24, 2026, 2:38 AM UTC
HKG → HNL	1	1	0	5,833 mi	10 hr 27 min	Aug 24, 2026, 6:44 PM UTC	Aug 25, 2026, 5:11 AM UTC

Observed tail number assignments

Tail numbers tracked as UA878

Open a tail number for its complete tracked profile.

20 tail numbers shown

Tail number	Type	Flights	Routes	Tracked distance	First observed	Last observed
N2250U	B77W	4	1	28,666 mi	Sep 2, 2026, 2:44 PM UTC	Sep 22, 2026, 2:44 AM UTC
N2645U	B77W	4	1	28,897 mi	Aug 25, 2026, 2:54 PM UTC	Sep 7, 2026, 3:24 AM UTC
N2333U	B77W	3	1	21,504 mi	Sep 7, 2026, 2:47 PM UTC	Sep 18, 2026, 2:35 AM UTC
N2251U	B77W	3	2	20,102 mi	Aug 24, 2026, 6:44 PM UTC	Sep 6, 2026, 2:45 AM UTC
N2138U	B77W	2	1	14,240 mi	Sep 9, 2026, 2:39 PM UTC	Sep 24, 2026, 2:38 AM UTC
N2341U

Observed aircraft types

Aircraft types tracked as UA878

Observed flights grouped by aircraft designator and matched to the aircraft reference catalog.

2 aircraft types shown

Type	Aircraft name	Flights	Makeup	Tail numbers	Tracked distance	Routes	First observed	Last observed
B77W	Boeing 777-300ER	33	97.1%	19	235,820 mi	2	Aug 20, 2026, 2:39 PM UTC	Sep 24, 2026, 2:38 AM UTC
B772	Boeing 777-200	1	2.9%	1	7,164 mi	1	Aug 30, 2026, 3:15 PM UTC	Aug 31, 2026, 3:35 AM UTC

Observation log

Flight observations

Latest 100 flights for UA878 within Aug 20 – Sep 24, 2026

35 observations shown

Confidence	Route	Tail number	Aircraft	First observed	Last observed	Observed	Tracked distance
High · 100	HKG → SFO	N2138U	B77W	Sep 23, 2026, 2:47 PM UTC	Sep 24, 2026, 2:38 AM UTC	11 hr 52 min	7,103 mi
High · 100	HKG → SFO	N2341U	B77W	Sep 22, 2026, 2:54 PM UTC	Sep 23, 2026, 2:24 AM UTC	11 hr 30 min	7,094 mi
High · 100	HKG → SFO