United Flight 1721 Deals & Information (2026/2027)

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United Flight 1721 Route Deals From $163

The cheapest prices found with in the last 7 days for return flights were $297 and $163 for one-way flights to Kona Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Aug 20 - Mon, Aug 24
SFO
San Francisco Intl.
KOA
Kona Intl.
$297 Roundtrip, found 21 hours ago
$297
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Aug 20 from San Francisco Intl. to Kona Intl., returning Mon, Aug 24, priced at $297 found 21 hours ago
Thu, Aug 20 - Mon, Aug 24
SFO
San Francisco Intl.
KOA
Kona Intl.
$306 Roundtrip, found 21 hours ago
$306
Roundtrip
found 21 hours ago
Select United flight, departing Thu, Aug 20 from San Francisco Intl. to Kona Intl., returning Mon, Aug 24, priced at $306 found 21 hours ago
Wed, Aug 19 - Mon, Aug 24
SFO
San Francisco Intl.
KOA
Kona Intl.
$319 Roundtrip, found 2 days ago
$319
Roundtrip
found 2 days ago
Select United flight, departing Wed, Aug 19 from San Francisco Intl. to Kona Intl., returning Mon, Aug 24, priced at $319 found 2 days ago
Mon, Oct 12 - Tue, Oct 20
SFO
San Francisco Intl.
KOA
Kona Intl.
$329 Roundtrip, found 6 days ago
$329
Roundtrip
found 6 days ago
Select United flight, departing Mon, Oct 12 from San Francisco Intl. to Kona Intl., returning Tue, Oct 20, priced at $329 found 6 days ago

Frequently asked questions

What route does flight number UA1721 take?
UA1721 operates between San Francisco, CA Airport (SFO-San Francisco Intl.) and KOA and flies direct. This journey typically takes 5 hours and 28 minutes.
What terminal does UA1721 fly out of?
Flight number UA1721 runs between SFO and KOA, and travelers taking this flight commonly depart from Terminal 3.
What kind of plane is on flight number UA1721?
There's a strong chance you'll be on a Boeing 737-900 if you've reserved a seat on flight UA1721. This flight usually heads off from San Francisco Intl. Airport (SFO) and lands at Kona Intl. Airport (KOA).
If I am not able to travel due to COVID-19, can I change my flight to a later date?
For more info about changing your UA1721 flight with Travelocity, please visit our Customer Service Portal.