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Sioux City

$365+ Cheap flights from Seattle to Sioux City (SEA - SUX)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 7/25. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SUX
Apr 25 — May 21
Sat 4/25
Sat 5/2
1 adult, Economy
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Cheap flight deals from Seattle to Sioux City

Cheapest flights from Seattle to Sioux City
Explore the most affordable flight options available from Seattle to Sioux City. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 26, 2026.

This United Airlines deal was found by Cheapflights users on 3/22. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/152:26 pm
SEA
-
SUX
1 stop7h 20m
United Airlines
Sat 9/196:30 pm
SUX
-
SEA
1 stop6h 41m
United Airlines
Deal found 3/22$424
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/13:40 pm
SEA
-
SUX
1 stop5h 52m
United Airlines
Sat 5/26:00 am
SUX
-
SEA
1 stop5h 40m
United Airlines
Deal found 3/25$450
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 5/13:40 pm
SEA
-
SUX
1 stop5h 52m
United Airlines
Sun 5/36:00 am
SUX
-
SEA
1 stop5h 40m
United Airlines
Deal found 3/25$479
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/3010:53 pm
SEA
-
SUX
1 stop17h 13m
United Airlines
Sun 5/36:00 am
SUX
-
SEA
1 stop5h 40m
United Airlines
Deal found 3/25$506
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/143:48 pm
SEA
-
SUX
1 stop16h 58m
United Airlines
Fri 4/176:32 pm
SUX
-
SEA
1 stop6h 01m
United Airlines
Deal found 3/24$510
This United Airlines deal was found by Cheapflights users on 3/24. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/95:00 am
SEA
-
SUX
2 stops10h 56m
United Airlines
Mon 4/1312:55 pm
SUX
-
SEA
1 stop8h 05m
United Airlines
Deal found 3/24$513
This United Airlines deal was found by Cheapflights users on 3/25. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 4/308:45 am
SEA
-
SUX
2 stops12h 47m
United Airlines
Sat 5/212:55 pm
SUX
-
SEA
2 stops12h 34m
United Airlines
Deal found 3/25$515

Find flight deals from Seattle to Sioux City

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Sioux City (SUX). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated March 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$424
(United Airlines)

One-way from

$365
(United Airlines)
Provider with most accurate pricing for Seattle/Tacoma Intl-Sioux City Sioux Gateway flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Sioux City Sioux Gateway flights.
Search Deals
From Seattle/Tacoma Intl to Sioux City Sioux Gateway
Search Deals
One-way flight from Seattle/Tacoma Intl to Sioux City Sioux Gateway
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Seattle to Sioux City that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2026.
Use the filters below to find and compare flights from Seattle to Sioux City that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Tue 9/15

2:26 pm-11:46 pm

1 stop7h 20m

Sioux City Sioux Gateway

Sat 9/19

6:30 pm-11:11 pm

1 stop6h 41m

$424
Quickest round-trip

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Thu 4/30

3:40 pm-11:32 pm

1 stop5h 52m

Sioux City Sioux Gateway

Sat 5/2

6:00 am-9:40 am

1 stop5h 40m

$517

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 4/15

7:05 pm-10:46 am

1 stop13h 41m

Sioux City Sioux Gateway

Fri 4/17

6:32 pm-10:33 pm

1 stop6h 01m

$549

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Thu 4/9

5:00 am-5:56 pm

2 stops10h 56m

Sioux City Sioux Gateway

Mon 4/13

6:00 am-3:51 pm

2 stops11h 51m

$553

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 6/10

3:33 pm-10:57 am

2 stops17h 24m

Sioux City Sioux Gateway

Tue 6/16

11:32 am-5:59 pm

1 stop8h 27m

$603

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 7/22

7:01 am-5:54 pm

1 stop8h 53m

Sioux City Sioux Gateway

Fri 7/31

11:32 am-5:59 pm

1 stop8h 27m

$609

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 5/13

5:05 am-10:41 am

1 stop27h 36m

Sioux City Sioux Gateway

Sun 5/17

6:00 am-9:40 am

1 stop5h 40m

$622

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Thu 5/21

7:54 pm-10:57 am

1 stop13h 03m

Sioux City Sioux Gateway

Sun 5/24

6:30 pm-8:00 am

1 stop15h 30m

$668
Cheapest one-way
Quickest one-way

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Thu 7/30

3:40 pm-11:41 pm

1 stop6h 01m

$369

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Tue 7/28

3:33 pm-10:57 am

2 stops17h 24m

$375

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/21

Showing 1-10 of 12 resultsSorted by cheapest first
1
2

Compare providers for flights from Seattle to Sioux City

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Seattle to Sioux City in March.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy1 starTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Seattle-Sioux City flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Seattle-Sioux City flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Seattle-Sioux City flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Seattle-Sioux City flights, Cheapflights users trust FlightHub the most. FlightHub has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Seattle-Sioux City flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Seattle to Sioux City

Have a flexible travel schedule? Discover the best time to fly to Sioux City from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Seattle to Sioux City

What is the cheapest month to book a flight from Seattle to Sioux City?

Currently, August is the cheapest month in which you can book a flight from Seattle to Sioux City (average of $145). Flying from Seattle to Sioux City in November is currently the most expensive (average of $230). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

Reviews of airlines servicing Sioux City

Get insights into the airlines that provide service to Sioux City. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Sioux City. Reviews last updated March 26, 2026.
See what other customers who have flown with United Airlines from Seattle to Sioux City have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
9,484 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family
United Airlines
7.4
Good
9,484 reviews
United Airlines
7.4
Good
9,484 reviews

Boarding

7.7

Overall

7.4

Crew

8.1

Entertainment

7.1

Comfort

7.3

Food

6.6

Reviews

1 / 20
10.0
Excellent

Dane,Jan 2026

TYS - IAD

It was a short flight, so no time for amenities. Just glad everything was quick and easy from boarding to arriving at my destination with my family

Related info for your journey

Find useful and relevant information for your journey from Seattle to Sioux City. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Seattle to Sioux City?

    There are many flights that can get you from Seattle to Sioux City in 10h 52m. Fly via United Airlines to get the fastest option. Airlines will cover a distance of 1308 mi.

  • What is the cheapest airline to fly from Seattle to Sioux City round-trip?

    United Airlines, at $253, was found to be the cheapest airline from Seattle to Sioux City..

  • Can I find deals for flights from Seattle to Sioux City that include hotel bookings?

    Yes. In addition to deals on Seattle to Sioux City flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Sioux City?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Sioux City.

  • Can I find deals for business class flights from Seattle to Sioux City?

    Yes. Cheapflights offers flight deals from Seattle to Sioux City by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Seattle to Sioux City?

    Currently, August is the cheapest month in which you can book a flight from Seattle to Sioux City (average of $145). Flying from Seattle to Sioux City in November is currently the most expensive (average of $230). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top airline flying from Seattle to Sioux City

Discover the top airline that operate flights from Seattle to Sioux City. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated March 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$253Average$333FlexibilityNo cancel feeOn-time69%

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