United Flight UA1223 Deals & Information (2025/2026)

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United Flight 1223 Route Deals From $112

The cheapest prices found with in the last 7 days for return flights were $189 and $112 for one-way flights to Denver Intl. for the period specified. Prices and availability are subject to change. Additional terms apply.

Wed, Apr 1 - Sun, Apr 5
FSD
Sioux Falls Regional
DEN
Denver Intl.
$189 Roundtrip, found 17 hours ago
$189
Roundtrip
found 17 hours ago
Select United flight, departing Wed, Apr 1 from Sioux Falls Regional to Denver Intl., returning Sun, Apr 5, priced at $189 found 17 hours ago
Wed, Oct 8 - Tue, Oct 14
FSD
Sioux Falls Regional
DEN
Denver Intl.
$193 Roundtrip, found 3 hours ago
$193
Roundtrip
found 3 hours ago
Select United flight, departing Wed, Oct 8 from Sioux Falls Regional to Denver Intl., returning Tue, Oct 14, priced at $193 found 3 hours ago
Thu, Nov 20 - Tue, Nov 25
FSD
Sioux Falls Regional
DEN
Denver Intl.
$194 Roundtrip, found 3 days ago
$194
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 20 from Sioux Falls Regional to Denver Intl., returning Tue, Nov 25, priced at $194 found 3 days ago
Sat, Oct 11 - Wed, Oct 15
FSD
Sioux Falls Regional
DEN
Denver Intl.
$198 Roundtrip, found 3 hours ago
$198
Roundtrip
found 3 hours ago
Select United flight, departing Sat, Oct 11 from Sioux Falls Regional to Denver Intl., returning Wed, Oct 15, priced at $198 found 3 hours ago
Fri, Dec 12 - Sun, Dec 14
FSD
Sioux Falls Regional
DEN
Denver Intl.
$199 Roundtrip, found 4 days ago
$199
Roundtrip
found 4 days ago
Select United flight, departing Fri, Dec 12 from Sioux Falls Regional to Denver Intl., returning Sun, Dec 14, priced at $199 found 4 days ago