United Flight UA1721 Deals & Information (2025/2026)

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United Flight 1721 Route Deals From $143

The cheapest prices found with in the last 7 days for return flights were $271 and $143 for one-way flights to Kona Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Mon, Oct 20 - Mon, Oct 27
SFO
San Francisco Intl.
KOA
Kona Intl.
$271 Roundtrip, found 4 days ago
$271
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 20 from San Francisco Intl. to Kona Intl., returning Mon, Oct 27, priced at $271 found 4 days ago
Mon, Oct 20 - Mon, Oct 27
SFO
San Francisco Intl.
KOA
Kona Intl.
$290 Roundtrip, found 4 days ago
$290
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 20 from San Francisco Intl. to Kona Intl., returning Mon, Oct 27, priced at $290 found 4 days ago
Mon, Oct 20 - Mon, Oct 27
SFO
San Francisco Intl.
KOA
Kona Intl.
$301 Roundtrip, found 4 days ago
$301
Roundtrip
found 4 days ago
Select United flight, departing Mon, Oct 20 from San Francisco Intl. to Kona Intl., returning Mon, Oct 27, priced at $301 found 4 days ago
Wed, Nov 12 - Wed, Nov 19
SFO
San Francisco Intl.
KOA
Kona Intl.
$328 Roundtrip, found 8 hours ago
$328
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Nov 12 from San Francisco Intl. to Kona Intl., returning Wed, Nov 19, priced at $328 found 8 hours ago
Wed, Nov 12 - Wed, Nov 19
SFO
San Francisco Intl.
KOA
Kona Intl.
$337 Roundtrip, found 8 hours ago
$337
Roundtrip
found 8 hours ago
Select United flight, departing Wed, Nov 12 from San Francisco Intl. to Kona Intl., returning Wed, Nov 19, priced at $337 found 8 hours ago
Thu, Sep 4 - Wed, Sep 10
SFO
San Francisco Intl.
KOA
Kona Intl.
$341 Roundtrip, found 1 day ago
$341
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from San Francisco Intl. to Kona Intl., returning Wed, Sep 10, priced at $341 found 1 day ago
Sun, Aug 31 - Mon, Sep 8
SFO
San Francisco Intl.
KOA
Kona Intl.
$348 Roundtrip, found 7 hours ago
$348
Roundtrip
found 7 hours ago
Select United flight, departing Sun, Aug 31 from San Francisco Intl. to Kona Intl., returning Mon, Sep 8, priced at $348 found 7 hours ago
Thu, Sep 4 - Wed, Sep 10
SFO
San Francisco Intl.
KOA
Kona Intl.
$361 Roundtrip, found 1 day ago
$361
Roundtrip
found 1 day ago
Select United flight, departing Thu, Sep 4 from San Francisco Intl. to Kona Intl., returning Wed, Sep 10, priced at $361 found 1 day 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.