Beginning of main content
Trip Type
Flight 1
Flight 2
Flight 3
Flight 4
Flight 5
Due to coronavirus (COVID-19) travel advisories, some destinations may be unavailable for certain dates. Find out more.

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 643 Route Deals From $99

The cheapest prices found with in the last 7 days for return flights were $345 and $99 for one-way flights to San Francisco Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

More United Flight For This Route

Carrier Flight Depart KOA Arrive SFO Sat
UA 643 10:15 am 05:21 pm Check fare Check fare Check fare - - Check fare Check fare 0 stop(s)
UA 1092 11:30 pm 06:34 am Check fare Check fare Check fare Check fare Check fare Check fare Check fare 0 stop(s)

FAQs about UA643

What route does flight number UA643 take?

Flight number UA643 takes around 5 hours and 7 minutes to jet straight from Kailua-Kona, HI (KOA-Kona Intl.) to San Francisco, CA (SFO-San Francisco Intl.). We all know there's magic in the destination, but the journey is always half the fun!

How often is UA643 on time?

About 88% of UA643 flights arrive according to scheduled times — so if you're flying between Kailua-Kona, HI (KOA-Kona Intl.) and San Francisco, CA (SFO-San Francisco Intl.), you can relax knowing that you will get where you need to as quickly as possible. In the rare instance that your United Airlines plane runs late, the average wait time is about 24 minutes. Due to the airline's high standard of service, this route has a star rating of 3.9.

What kind of plane is on flight number UA643?

There's every chance you'll find yourself stepping on board a Boeing 737-900 if you've reserved a seat on flight UA643. This flight almost always sets off from Kailua-Kona, HI (KOA-Kona Intl.) and lands at San Francisco, CA (SFO-San Francisco Intl.).