United Flight UA1721 Deals & Information (2025/2026)

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United Flight 1721 Route Deals From $139

The cheapest prices found with in the last 7 days for return flights were $278 and $139 for one-way flights to Kona Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jan 12 - Mon, Jan 26
SFO
San Francisco Intl.
KOA
Kona Intl.
$278 Roundtrip, found 11 hours ago
$278
Roundtrip
found 11 hours ago
Select United flight, departing Mon, Jan 12 from San Francisco Intl. to Kona Intl., returning Mon, Jan 26, priced at $278 found 11 hours ago
Wed, Nov 12 - Wed, Nov 19
SFO
San Francisco Intl.
KOA
Kona Intl.
$278 Roundtrip, found 14 hours ago
$278
Roundtrip
found 14 hours ago
Select United flight, departing Wed, Nov 12 from San Francisco Intl. to Kona Intl., returning Wed, Nov 19, priced at $278 found 14 hours ago
Wed, Nov 12 - Wed, Nov 19
SFO
San Francisco Intl.
KOA
Kona Intl.
$282 Roundtrip, found 14 hours ago
$282
Roundtrip
found 14 hours ago
Select United flight, departing Wed, Nov 12 from San Francisco Intl. to Kona Intl., returning Wed, Nov 19, priced at $282 found 14 hours 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.