United Flight 5645 Deals & Information (2026/2027)

Wander Wisely with exceptional service, 24/7 supportOpens in a new window

Feel at ease with free flight cancellations within 24 hours of booking

Change your flight without a fee on select flights

United Flight 5645 Route Deals From $269

The cheapest prices found with in the last 7 days for return flights were $299 and $269 for one-way flights to Sioux Falls Regional for the period specified. Prices and availability are subject to change. Additional terms apply.

Thu, Nov 5 - Sun, Nov 8
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$299 Roundtrip, found 3 days ago
$299
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 5 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Nov 8, priced at $299 found 3 days ago
Thu, Nov 5 - Sun, Nov 8
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$312 Roundtrip, found 3 days ago
$312
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 5 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Nov 8, priced at $312 found 3 days ago
Thu, Oct 22 - Sun, Oct 25
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$317 Roundtrip, found 4 days ago
$317
Roundtrip
found 4 days ago
Select United flight, departing Thu, Oct 22 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Oct 25, priced at $317 found 4 days ago
Thu, Nov 5 - Sun, Nov 8
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$325 Roundtrip, found 3 days ago
$325
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 5 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Nov 8, priced at $325 found 3 days ago
Fri, Oct 23 - Sun, Oct 25
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$332 Roundtrip, found 3 days ago
$332
Roundtrip
found 3 days ago
Select United flight, departing Fri, Oct 23 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Oct 25, priced at $332 found 3 days ago
Wed, Nov 25 - Sat, Nov 28
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$346 Roundtrip, found 16 hours ago
$346
Roundtrip
found 16 hours ago
Select United flight, departing Wed, Nov 25 from O'Hare Intl. to Sioux Falls Regional, returning Sat, Nov 28, priced at $346 found 16 hours ago
Wed, Oct 14 - Sun, Oct 18
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$354 Roundtrip, found 6 days ago
$354
Roundtrip
found 6 days ago
Select United flight, departing Wed, Oct 14 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Oct 18, priced at $354 found 6 days ago
Wed, Nov 25 - Sat, Nov 28
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$359 Roundtrip, found 16 hours ago
$359
Roundtrip
found 16 hours ago
Select United flight, departing Wed, Nov 25 from O'Hare Intl. to Sioux Falls Regional, returning Sat, Nov 28, priced at $359 found 16 hours ago
Fri, Oct 9 - Mon, Oct 12
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$359 Roundtrip, found 4 days ago
$359
Roundtrip
found 4 days ago
Select United flight, departing Fri, Oct 9 from O'Hare Intl. to Sioux Falls Regional, returning Mon, Oct 12, priced at $359 found 4 days ago
Wed, Nov 25 - Sat, Nov 28
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$361 Roundtrip, found 16 hours ago
$361
Roundtrip
found 16 hours ago
Select United flight, departing Wed, Nov 25 from O'Hare Intl. to Sioux Falls Regional, returning Sat, Nov 28, priced at $361 found 16 hours ago
Sat, Oct 17 - Tue, Oct 20
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$368 Roundtrip, found 1 day ago
$368
Roundtrip
found 1 day ago
Select United flight, departing Sat, Oct 17 from O'Hare Intl. to Sioux Falls Regional, returning Tue, Oct 20, priced at $368 found 1 day ago
Thu, Nov 5 - Sun, Nov 8
ORD
O'Hare Intl.
FSD
Sioux Falls Regional
$374 Roundtrip, found 3 days ago
$374
Roundtrip
found 3 days ago
Select United flight, departing Thu, Nov 5 from O'Hare Intl. to Sioux Falls Regional, returning Sun, Nov 8, priced at $374 found 3 days ago

Frequently asked questions

What route does flight number UA5645 take?
Flight number UA5645 takes 2 hours and 8 minutes to fly directly from Los Angeles Intl. Airport (LAX) to EUG. Sure, there's magic in the destination, but the journey is always half the fun!
What terminal does UA5645 fly out of?
Direct flights to and from Los Angeles Intl. Airport (LAX) and Mahlon Sweet Field are served by UA5645, and those traveling on this flight typically jet off from Terminal 7.
What kind of plane is on flight number UA5645?
The route for flight number UA5645 is most commonly LAX to EUG, and the Embraer 175 is the aircraft model you'll probably be traveling on.
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 UA5645 flight with Travelocity, please visit our Customer Service Portal.