| Date | From | To | Departure | Arrival | Status | |
|---|---|---|---|---|---|---|
| Jul 04 | LHR | SFO | 19:19 | 21:54 |
Landed
|
Track > |
United Airlines Flight UA3940 connects London, United Kingdom to San Francisco, United States, taking off from London Heathrow Airport LHR and landing at San Francisco International Airport SFO.
How long is the UA3940 flight from London to San Francisco?
The average flight time from London to San Francisco is 10 hours and 35 minutes. The flight distance is 8615 km / 5353 miles and the average flight speed is 814 km/h / 506 mph.
What is the On-Time Performance (OTP) of United Airlines Flight UA3940 London to San Francisco?
The Airportia On-Time Performance Rating for United Airlines Flight UA3940 is 5/5 stars. This metric is calculated using data from the past 10 flights.
Which terminal is the flight UA3940 arriving at?
Flight UA3940 arrives at San Francisco International Airport (SFO) Terminal INTL.
When was the latest UA3940 flight?
The latest flight took off on Sunday, July 5th, 2026 with the flight status being Landed on 21:54.
How else can the flight UA3940 be referenced as?
This United Airlines flight can also be referenced as UAL3940, UA 3940, UAL 3940.
How often is flight UA3940 delayed?
On average, 0% of all UA3940 flights are delayed. The average delay is 0 minutes.
Can I get compensation for my delayed or cancelled UA3940 flight or baggage issues?
If your UA3940 flight was cancelled, delayed, or if you experienced baggage issues such as delayed, damaged, or lost bags, you may be entitled to compensation. Compensation amounts and eligibility depend on various regulations, including EC 261/2004, UK261, CA Montreal Convention, US GoodWill, BR-ANAC, SA-GACA and TK-SHY.
See our UA3940 Flight Tracker above for more details.
Other flights departing from London LHR: BA55, BA378, NH212, BA522
Other flights arriving at San Francisco SFO: UA693, WN2697, AA6260, F92677
All flights connecting London LHR to San Francisco SFO.