What is the cheapest airline that flies from Idaho to South Dakota?

Allegiant Air and United Airlines are the most popular carriers operating from Idaho to South Dakota

What airlines fly to South Dakota?

United Airlines, Delta and American Airlines are the top three most popular airlines that fly to South Dakota from Idaho according to our data. United Airlines is the first choice among our users, with 70% of people opting to fly with this airline when traveling to South Dakota. Keep in mind that there are 3 different airlines that fly to South Dakota on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Idaho to South Dakota?

Prices for flights from Idaho to South Dakota refresh daily.

How many operators does momondo search for flights from Idaho to South Dakota?

There are 3 operators available for flights from Idaho to South Dakota as of December 2025.

How old do you have to be to fly from Idaho to South Dakota?

The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Idaho to South Dakota.

What documentation or ID do you need to fly to South Dakota?

The required travel and health documents for your South Dakota trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at South Dakota. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$218 Cheap Flights from Idaho to South Dakota in 2025/26

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Find the cheapest flights from Idaho to South Dakota

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

2:00 pm - 10:28 pm

GEG

RAP

7h 28m1 stop

6:00 am - 1:03 pm

RAP

GEG

8h 03m1 stop

$269Delta

Tue, Jan 27 - Sat, Jan 31

1:20 pm - 10:28 pm

GEG

RAP

8h 08m2 stops

6:00 am - 1:03 pm

RAP

GEG

8h 03m1 stop

$274Delta

Tue, Jan 27 - Sat, Jan 31

5:12 pm - 11:55 pm

BOI

FSD

5h 43m1 stop

6:00 am - 10:01 am

FSD

BOI

5h 01m1 stop

$284United Airlines

Thu, Jan 1 - Mon, Jan 5

1:47 pm - 11:55 pm

GEG

FSD

8h 08m1 stop

5:12 pm - 8:58 pm

FSD

GEG

5h 46m1 stop

$284United Airlines

Thu, Jan 1 - Mon, Jan 5

5:12 pm - 11:55 pm

BOI

FSD

5h 43m1 stop

1:52 pm - 10:30 pm

FSD

BOI

9h 38m2 stops

$289United Airlines

Thu, Jan 1 - Mon, Jan 5

1:40 pm - 11:08 pm

GEG

FSD

7h 28m2 stops

8:05 am - 1:11 pm

FSD

GEG

7h 06m1 stop

$299Delta

Tue, Mar 24 - Mon, Mar 30

2:37 pm - 8:24 pm

BOI

FSD

4h 47m1 stop

9:00 am - 7:51 pm

FSD

BOI

11h 51m2 stops

$309United Airlines

Sat, Feb 7 - Wed, Feb 11

4:19 pm - 8:32 pm

IDA

RAP

4h 13m1 stop

5:10 am - 9:56 am

RAP

IDA

4h 46m1 stop

$309United Airlines

Wed, Jan 14 - Sat, Jan 17

3:10 pm - 11:59 pm

GEG

FSD

6h 49m1 stop

1:26 pm - 9:12 pm

FSD

GEG

9h 46m1 stop

$409American Airlines

Tue, Mar 24 - Mon, Mar 30

6:00 am - 2:31 pm

GEG

FSD

6h 31m1 stop

5:19 pm - 12:23 am

FSD

GEG

9h 04m1 stop

$455American Airlines

Thu, Mar 26 - Sun, Apr 5

American Airlines flights from Idaho to South Dakota

Our best American Airlines deals on Idaho to South Dakota flight tickets

American Airlines

Mar 24

GEG3:10 pmSpokane

6h 49m

1 stop

FSD11:59 pmSioux Falls Joe Foss Field

Mar 30

FSD1:26 pmSioux Falls Joe Foss Field

9h 46m

1 stop

GEG9:12 pmSpokane

$409

Find similar

American Airlines

Mar 26

GEG6:00 amSpokane

6h 31m

1 stop

FSD2:31 pmSioux Falls Joe Foss Field

Apr 5

FSD5:19 pmSioux Falls Joe Foss Field

9h 04m

1 stop

GEG12:23 amSpokane

$455

Find similar

American Airlines

Dec 26

BOI1:27 pmBoise Air Term. Gowen Fld

9h 32m

2 stops

FSD11:59 pmSioux Falls Joe Foss Field

Dec 30

FSD7:11 amSioux Falls Joe Foss Field

10h 42m

2 stops

BOI4:53 pmBoise Air Term. Gowen Fld

$1,567

Find similar

United Airlines flights from Idaho to South Dakota

Our best United Airlines deals on Idaho to South Dakota flight tickets

United Airlines

Jan 17

BOI9:48 amBoise Air Term. Gowen Fld

7h 24m

1 stop

RAP5:12 pmRapid City

Jan 20

RAP7:00 amRapid City

6h 35m

1 stop

BOI1:35 pmBoise Air Term. Gowen Fld

$279

Find similar

United Airlines

Jan 1

GEG1:47 pmSpokane

8h 08m

1 stop

FSD11:55 pmSioux Falls Joe Foss Field

Jan 5

FSD5:12 pmSioux Falls Joe Foss Field

5h 46m

1 stop

GEG8:58 pmSpokane

$284

Find similar

United Airlines

Jan 1

BOI5:12 pmBoise Air Term. Gowen Fld

5h 43m

1 stop

FSD11:55 pmSioux Falls Joe Foss Field

Jan 5

FSD1:52 pmSioux Falls Joe Foss Field

9h 38m

2 stops

BOI10:30 pmBoise Air Term. Gowen Fld

$289

Find similar

Fly from

Fly to

Route

Depart

Return

Price

SpokaneRapid City

GEG - RAP

GEGRAP

Spokane

Tue 1/27

2:00 pm-10:28 pm

1 stop7h 28m

Rapid City

Sat 1/31

6:00 am-1:03 pm

1 stop8h 03m

$269

SpokaneRapid City

GEG - RAP

GEGRAP

Spokane

Tue 1/27

1:20 pm-10:28 pm

2 stops8h 08m

Rapid City

Sat 1/31

6:00 am-1:03 pm

1 stop8h 03m

$274

BoiseSioux Falls

BOI - FSD

BOIFSD

Boise Air Term. Gowen Fld

Thu 1/1

5:12 pm-11:55 pm

1 stop5h 43m

Sioux Falls Joe Foss Field

Mon 1/5

6:00 am-10:01 am

1 stop5h 01m

$284

SpokaneSioux Falls

GEG - FSD

GEGFSD

Spokane

Thu 1/1

1:47 pm-11:55 pm

1 stop8h 08m

Sioux Falls Joe Foss Field

Mon 1/5

5:12 pm-8:58 pm

1 stop5h 46m

$284

BoiseSioux Falls

BOI - FSD

BOIFSD

Boise Air Term. Gowen Fld

Thu 1/1

5:12 pm-11:55 pm

1 stop5h 43m

Sioux Falls Joe Foss Field

Mon 1/5

1:52 pm-10:30 pm

2 stops9h 38m

$289

SpokaneSioux Falls

GEG - FSD

GEGFSD

Spokane

Tue 3/24

1:40 pm-11:08 pm

2 stops7h 28m

Sioux Falls Joe Foss Field

Mon 3/30

8:05 am-1:11 pm

1 stop7h 06m

$299

BoiseSioux Falls

BOI - FSD

BOIFSD

Boise Air Term. Gowen Fld

Sat 2/7

2:37 pm-8:24 pm

1 stop4h 47m

Sioux Falls Joe Foss Field

Wed 2/11

9:00 am-7:51 pm

2 stops11h 51m

$309

Idaho FallsRapid City

IDA - RAP

IDARAP

Idaho Falls Fanning Field

Wed 1/14

4:19 pm-8:32 pm

1 stop4h 13m

Rapid City

Sat 1/17

5:10 am-9:56 am

1 stop4h 46m

$309

SpokaneSioux Falls

GEG - FSD

GEGFSD

Spokane

Tue 3/24

3:10 pm-11:59 pm

1 stop6h 49m

Sioux Falls Joe Foss Field

Mon 3/30

1:26 pm-9:12 pm

1 stop9h 46m

$409

SpokaneSioux Falls

GEG - FSD

GEGFSD

Spokane

Thu 3/26

6:00 am-2:31 pm

1 stop6h 31m

Sioux Falls Joe Foss Field

Sun 4/5

5:19 pm-12:23 am

1 stop9h 04m

$455

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 resultsSorted by cheapest first

How to get the cheapest flight ticket from Idaho to South Dakota

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest month to fly to South Dakota?

The month of June is, on average, the cheapest month to fly to South Dakota from Idaho, with most prices found around $309. If you aren’t able to travel to South Dakota during the month of June, then flying in September is also cheap. Prices for this month can be found on momondo for an average of $368.

What is the cheapest day to depart on your flight to South Dakota?

The cheapest day to depart from Idaho to South Dakota is on a Saturday. Travelers who choose to depart for South Dakota on a Saturday will often find tickets for as low as $365. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $681. These prices are subject to change though, so be sure to set up a Price Alert for flights to South Dakota.

What is the cheapest time of day to depart on your flight to South Dakota?

The cheapest time of day to fly to South Dakota is in the afternoon when flights can be purchased for as low as $368. At noon is when there is more demand to fly to South Dakota, so prices are often more expensive at around $569 per ticket.

Can stopping save me money on Idaho to South Dakota flights?

You could potentially save up to 49% on your flight if you consider stops on a Idaho to South Dakota flight.

Cheap Idaho to South Dakota flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Idaho to South Dakota

Fastest flight time	4h 03m
Direct flights	None

The fastest flight from Idaho to South Dakota takes 4h 03m

There are no direct flights from Idaho to South Dakota. There are no popular flight routes from Idaho to South Dakota.

Search flight deals

When did momondo last update prices for flights from Idaho to South Dakota?
Prices for flights from Idaho to South Dakota refresh daily.
How many operators does momondo search for flights from Idaho to South Dakota?
There are 3 operators available for flights from Idaho to South Dakota as of December 2025.
How old do you have to be to fly from Idaho to South Dakota?
The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Idaho to South Dakota.
What documentation or ID do you need to fly to South Dakota?
The required travel and health documents for your South Dakota trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at South Dakota. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

Best airlines flying from Idaho to South Dakota

Compare and see reviews for airlines that fly from Idaho to South Dakota with momondo

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $228	Free Cancellation	Rating 7.4 9,091 reviews	Search United Airlines flights
Delta	PriceFrom $228	Free Cancellation	Rating 7.9 8,005 reviews	Search Delta flights
American Airlines	PriceFrom $250	Free Cancellation	Rating 7.2 11,054 reviews	Search American Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Idaho to South Dakota?

It is quick and easy to find Idaho to South Dakota flights on momondo. We search and return numerous flight options from various airlines and agents. You can then use our filters to narrow your search until you have found the most convenient flight to South Dakota that suits you.

Can I find flights from Idaho to South Dakota with flexible booking policies on momondo?

Flights from Idaho to South Dakota with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Idaho to South Dakota?

momondo provides multiple filters to help you find the best flight to South Dakota from Idaho. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

I’m not ready to book a flight from Idaho to South Dakota right now. Can momondo alert me if prices change?

If you are simply researching potential flights to South Dakota, momondo offers a useful price alert feature which will track prices for flights to South Dakota from Idaho and alert you when they change.