United Flight 1721 Deals & Information (2026/2027)

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United Flight 1721 Route Deals From $184

The cheapest prices found with in the last 7 days for return flights were $261 and $184 for one-way flights to Kona Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Jun 1 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$261 Roundtrip, found 4 hours ago
$261
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Jun 1 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $261 found 4 hours ago
Mon, Jun 1 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$292 Roundtrip, found 4 hours ago
$292
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Jun 1 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $292 found 4 hours ago
Mon, Jun 1 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$300 Roundtrip, found 4 hours ago
$300
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Jun 1 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $300 found 4 hours ago
Mon, Apr 27 - Thu, May 7
SFO
San Francisco Intl.
KOA
Kona Intl.
$302 Roundtrip, found 6 days ago
$302
Roundtrip
found 6 days ago
Select United flight, departing Mon, Apr 27 from San Francisco Intl. to Kona Intl., returning Thu, May 7, priced at $302 found 6 days ago
Tue, May 5 - Tue, May 12
SFO
San Francisco Intl.
KOA
Kona Intl.
$323 Roundtrip, found 2 days ago
$323
Roundtrip
found 2 days ago
Select United flight, departing Tue, May 5 from San Francisco Intl. to Kona Intl., returning Tue, May 12, priced at $323 found 2 days ago
Mon, Jun 1 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$330 Roundtrip, found 4 hours ago
$330
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Jun 1 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $330 found 4 hours ago
Tue, May 5 - Tue, May 12
SFO
San Francisco Intl.
KOA
Kona Intl.
$333 Roundtrip, found 2 days ago
$333
Roundtrip
found 2 days ago
Select United flight, departing Tue, May 5 from San Francisco Intl. to Kona Intl., returning Tue, May 12, priced at $333 found 2 days ago
Fri, Apr 24 - Mon, Apr 27
SFO
San Francisco Intl.
KOA
Kona Intl.
$336 Roundtrip, found 5 days ago
$336
Roundtrip
found 5 days ago
Select United flight, departing Fri, Apr 24 from San Francisco Intl. to Kona Intl., returning Mon, Apr 27, priced at $336 found 5 days ago
Mon, Jun 1 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$339 Roundtrip, found 4 hours ago
$339
Roundtrip
found 4 hours ago
Select United flight, departing Mon, Jun 1 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $339 found 4 hours ago
Fri, May 8 - Fri, May 15
SFO
San Francisco Intl.
KOA
Kona Intl.
$343 Roundtrip, found 18 hours ago
$343
Roundtrip
found 18 hours ago
Select United flight, departing Fri, May 8 from San Francisco Intl. to Kona Intl., returning Fri, May 15, priced at $343 found 18 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.