United Flight 1721 Deals & Information (2026/2027)

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United Flight 1721 Route Deals From $178

The cheapest prices found with in the last 7 days for return flights were $263 and $178 for one-way flights to Kona Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Tue, Jun 2 - Mon, Jun 8
SFO
San Francisco Intl.
KOA
Kona Intl.
$263 Roundtrip, found 4 days ago
$263
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Mon, Jun 8, priced at $263 found 4 days ago
Tue, Jun 2 - Mon, Jun 8
SFO
San Francisco Intl.
KOA
Kona Intl.
$273 Roundtrip, found 4 days ago
$273
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Mon, Jun 8, priced at $273 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$279 Roundtrip, found 4 days ago
$279
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $279 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$302 Roundtrip, found 4 days ago
$302
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $302 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$311 Roundtrip, found 4 days ago
$311
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $311 found 4 days ago
Sun, May 31 - Sat, Jun 6
SFO
San Francisco Intl.
KOA
Kona Intl.
$317 Roundtrip, found 6 days ago
$317
Roundtrip
found 6 days ago
Select United flight, departing Sun, May 31 from San Francisco Intl. to Kona Intl., returning Sat, Jun 6, priced at $317 found 6 days ago
Mon, May 25 - Mon, Jun 1
SFO
San Francisco Intl.
KOA
Kona Intl.
$327 Roundtrip, found 4 days ago
$327
Roundtrip
found 4 days ago
Select United flight, departing Mon, May 25 from San Francisco Intl. to Kona Intl., returning Mon, Jun 1, priced at $327 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$335 Roundtrip, found 4 days ago
$335
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $335 found 4 days ago
Mon, May 25 - Mon, Jun 1
SFO
San Francisco Intl.
KOA
Kona Intl.
$336 Roundtrip, found 4 days ago
$336
Roundtrip
found 4 days ago
Select United flight, departing Mon, May 25 from San Francisco Intl. to Kona Intl., returning Mon, Jun 1, priced at $336 found 4 days ago
Tue, Jun 2 - Mon, Jun 8
SFO
San Francisco Intl.
KOA
Kona Intl.
$343 Roundtrip, found 4 days ago
$343
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Mon, Jun 8, priced at $343 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$345 Roundtrip, found 4 days ago
$345
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $345 found 4 days ago
Tue, Jun 2 - Mon, Jun 8
SFO
San Francisco Intl.
KOA
Kona Intl.
$348 Roundtrip, found 4 days ago
$348
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Mon, Jun 8, priced at $348 found 4 days ago
Tue, Jun 2 - Tue, Jun 9
SFO
San Francisco Intl.
KOA
Kona Intl.
$359 Roundtrip, found 4 days ago
$359
Roundtrip
found 4 days ago
Select United flight, departing Tue, Jun 2 from San Francisco Intl. to Kona Intl., returning Tue, Jun 9, priced at $359 found 4 days ago
Tue, May 26 - Thu, Jun 4
SFO
San Francisco Intl.
KOA
Kona Intl.
$364 Roundtrip, found 3 days ago
$364
Roundtrip
found 3 days ago
Select United flight, departing Tue, May 26 from San Francisco Intl. to Kona Intl., returning Thu, Jun 4, priced at $364 found 3 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.