UAL3940

For travellers

Departure · San Francisco (SFO)

Terminal T3 · Gate F22

Scheduled 30 Sep 17:00 · Departed 30 Sep 16:51 · early

Board status: Departed

Airborne since 30 Sep 17:24 (ADS-B)

Arrival · Chicago (ORD)

Terminal 1 · Gate C18

Scheduled 30 Sep 23:07 · Landed 30 Sep 23:01 · early

Board status: Active

Landed 30 Sep 23:01 (airport data)

Board data from ord, sfo, updated 3780 min ago; times local to each airport.

Flight

Status

Completed (landing confirmed by airport data)

Arrival confirmed via

Airport data (confirmed)

Departure

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

Scheduled departure

2026-10-01 00:00 UTC

Departed

2026-10-01 00:24 UTC

Arrival

Chicago O'Hare International Airport (ORD) — Chicago, United States

Scheduled arrival

2026-10-01 04:07 UTC

Estimated arrival

2026-10-01 03:47 UTC

Also flies as

UA3940

Distance flown

3054 km

Straight-line distance

2964 km

Aircraft

Registration

N27901

Type

Boeing 787-8

Seats

243 total (158 Economy, 36 Economy Plus, 21 Premium Plus, 28 Polaris)

CO2 (EMEP est., total)

126.1 t (1190 kg/pax Business, 539 kg/pax Premium Economy, 419 kg/pax Economy)

Altitude & speed

Max altitude

41,025 ft

Max ground speed

554 kt

Tracked

3h 37m · 3,050 km

Altitude (ft, max 41,025)

Ground speed (kt, max 554)

Altitude (ft, max 41,025)

Ground speed (kt, max 554)

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
2026-10-03 14:57 UTC	UAL3940	TPA → MCO Tampa → Orlando	N57409	Boeing 737 MAX 9	Completed (landing confirmed by airport data)	202 km
2026-10-01 00:24 UTC	UAL3940	SFO → ORD San Francisco → Chicago	N27901	Boeing 787-8	Completed (landing confirmed by airport data)	3054 km
2026-09-28 05:28 UTC	UAL3940	EWR → ORD Newark → Chicago	N670UA	Boeing B767 300ER	Completed	1282 km
2026-09-25 18:41 UTC	UAL3940	IAD → EWR Washington, DC → Newark	N451UA	Airbus A320 233	Completed	433 km
2026-09-21 22:58 UTC	UAL3940	RIC → ORF Richmond → Norfolk	N813UA	Airbus A319	Completed	148 km
2026-09-20 05:00 UTC	UAL3940	ABQ → DEN Albuquerque → Denver	N76504	Boeing 737-800	Completed	696 km
2026-09-15 16:41 UTC	UAL3940	BNA → DEN Nashville → Denver	N846UA	Airbus A319	Completed	1781 km
2026-09-09 22:56 UTC	UAL3940	DEN → ORD Denver → Chicago	N821UA	Airbus A319	Completed	1674 km
2026-09-08 11:40 UTC	UAL3940	DEN → OKC Denver → Oklahoma City	N17233	Boeing 737-800	Completed	920 km
2026-09-06 15:38 UTC	UAL3940	ATL → ORD Atlanta → Chicago	N23721	Boeing 737-700	Completed	1215 km
2026-09-02 00:49 UTC	UAL3940	LAS → LAX Las Vegas → Los Angeles	N33264	Boeing 737-800	Completed	462 km
2026-08-26 11:53 UTC	UAL3940	MEX → DEN Mexico City → Denver	N491UA	Airbus A320 233	Completed	2516 km
2026-08-23 22:58 UTC	UAL3940	ORD → IND Chicago → Indianapolis	N475UA	Airbus A320 233	Completed	343 km
2026-08-22 01:33 UTC	UAL3940	SFO → DEN San Francisco → Denver	N14549	Airbus A321 Neo	Completed	2410 km
2026-08-20 12:12 UTC	UAL3940	LAS → SFO Las Vegas → San Francisco	N37290	Boeing 737-800	Completed	1454 km
2026-08-18 11:32 UTC	UAL3940	SRQ → EWR Sarasota/Bradenton → Newark	N17753	Boeing 737-700	Completed	3233 km
2026-08-17 05:41 UTC	UAL3940	HKG → LAX Hong Kong → Los Angeles	N29977	Boeing 787-9	Completed	13547 km