UAL1721

Flight

Status

Completed

Departure

San Francisco International Airport (SFO) — San Francisco, United States

Departed

2026-08-23 15:46 UTC

Arrival

Ellison Onizuka Kona International Airport at Keahole (KOA) — Kailua-Kona, United States

Distance flown

3924 km

Straight-line distance

3808 km

Approach distance

90 km

Aircraft

Registration

N57855

Type

Boeing 737-300

Seats

213 total (24 Business, 189 Economy)

Altitude & speed

Max altitude

36,025 ft

Max ground speed

498 kt

Tracked

4h 58m · 3,892 km

Altitude (ft, max 36,025)

Ground speed (kt, max 498)

Altitude (ft, max 36,025)

Ground speed (kt, max 498)

From the ADS-B positions we received; time since the first fix. A dashed stretch is a gap in reception, bridged by a straight line.

Route map

Airline

United Airlines (UAL)

Latest flights

Departed	Flight	Route	Reg	Aircraft	Status	Distance
2026-10-02 15:36 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N47505	Boeing 737 MAX 9	In progress	~3808 km est.
2026-10-01 15:32 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17413	Boeing 737 MAX 9	Completed (landing presumed)	3902 km
2026-09-30 15:25 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17430	Boeing 737 MAX 9	Completed	3895 km
2026-09-29 15:27 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37415	Boeing 737 MAX 9	Completed	3886 km
2026-09-28 15:34 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37521	Boeing 737 MAX 9	Completed	3870 km
2026-09-27 15:23 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17430	Boeing 737 MAX 9	Completed	3845 km
2026-09-26 15:16 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37440	Boeing 737 MAX 9	Completed	3842 km
2026-09-25 15:30 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17589	Boeing 737 MAX 9	Completed	3844 km
2026-09-24 15:01 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17408	Boeing 737 MAX 9	Completed	3889 km
2026-09-23 15:38 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17418	Boeing 737 MAX 9	Completed	3845 km
2026-09-22 15:33 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17467	Boeing 737 MAX 9	Completed	3897 km
2026-09-21 15:33 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N27503	Boeing 737 MAX 9	Completed	3850 km
2026-09-20 15:33 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37560	Boeing 737 MAX 9	Completed	3853 km
2026-09-19 15:10 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N77598	Boeing 737 MAX 9	Completed	3872 km
2026-09-18 15:51 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37472	Boeing 737 MAX 9	Completed	3904 km
2026-09-17 15:31 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17550	Boeing 737 MAX 9	Completed	4049 km
2026-09-16 15:40 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17454	Boeing 737 MAX 9	Completed	3956 km
2026-09-15 16:33 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17454	Boeing 737 MAX 9	Completed	3963 km
2026-09-14 15:11 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17454	Boeing 737 MAX 9	Completed	4010 km
2026-09-13 15:26 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N77572	Boeing 737 MAX 9	Completed	3983 km
2026-09-12 15:49 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N27520	Boeing 737 MAX 9	Completed	3877 km
2026-09-11 15:32 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N37540	Boeing 737 MAX 9	Completed	3926 km
2026-09-10 18:13 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17459	Boeing 737 MAX 9	Completed	4010 km
2026-09-09 15:34 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N17418	Boeing 737 MAX 9	Completed	3935 km
2026-09-07 15:44 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75853	Boeing 737-300	Completed	3869 km
2026-09-06 15:34 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75853	Boeing 737-300	Completed	3904 km
2026-09-05 15:25 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N77871	Boeing 737-300	Completed	3871 km
2026-09-04 15:38 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57852	Boeing 737-300	Completed	3843 km
2026-09-03 15:30 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75853	Boeing 737-300	Completed	3859 km
2026-09-02 15:26 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N78866	Boeing 737-300	Completed	3907 km
2026-09-01 15:42 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57868	Boeing 737-300	Completed	3861 km
2026-08-31 15:47 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57864	Boeing 737-300	Completed	3880 km
2026-08-30 15:46 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N73860	Boeing 737-300	Completed	3860 km
2026-08-29 15:32 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N77867	Boeing 737-300	Completed	3878 km
2026-08-28 15:49 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57857	Boeing 737-300	Completed	3873 km
2026-08-27 15:47 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N56859	Boeing 737-300	Completed	3896 km
2026-08-26 15:24 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57857	Boeing 737-300	Completed	3940 km
2026-08-25 15:34 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75861	Boeing 737-300	Completed	3919 km
2026-08-24 15:33 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75854	Boeing 737-300	Completed	3857 km
2026-08-23 15:46 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57855	Boeing 737-300	Completed	3924 km
2026-08-22 15:42 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75851	Boeing 737-300	Completed	4027 km
2026-08-21 15:51 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75851	Boeing 737-300	Completed	4006 km
2026-08-20 15:52 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N74856	Boeing 737-300	Completed	4187 km
2026-08-19 15:56 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N73860	Boeing 737-300	Completed	4036 km
2026-08-18 15:41 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N73860	Boeing 737-300	Completed	4287 km
2026-08-17 15:44 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N73860	Boeing 737-300	Completed	4157 km
2026-08-16 16:02 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N57855	Boeing 737-300	Completed	4051 km
2026-08-14 15:37 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75854	Boeing 737-300	Completed	~7444 km est. (4037 km recorded)
2026-08-12 15:30 UTC	UAL1721	SFO → KOA San Francisco → Kailua-Kona	N75858	Boeing 737-300	Completed	4066 km
2026-08-11 16:09 UTC	UAL1721	? → KOA ? → Kailua-Kona	N57870	Boeing 737-300	Completed	3343 km