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Sioux City

$274+ Cheap flights from Seattle to Sioux City (SEA - SUX)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SUX
Mar 14 — Mar 211
Sat 3/14
Sat 3/21
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 February 12, 2026.

This United Airlines deal was found by Cheapflights users on 2/12. 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.
Wed 4/153:48 pm
SEA
-
SUX
1 stop5h 56m
United Airlines
Wed 4/226:32 pm
SUX
-
SEA
1 stop6h 24m
United Airlines
Deal found 2/12$274
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Wed 4/153:48 pm
SEA
-
SUX
1 stop5h 56m
United Airlines
Fri 4/176:00 am
SUX
-
SEA
1 stop5h 46m
United Airlines
Deal found 2/11$317
This United Airlines deal was found by Cheapflights users on 2/10. 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.
Wed 2/257:00 am
SEA
-
SUX
1 stop8h 41m
United Airlines
Sun 3/16:46 pm
SUX
-
SEA
1 stop6h 13m
United Airlines
Deal found 2/10$403
This United Airlines deal was found by Cheapflights users on 2/11. 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.
Sat 2/287:00 am
SEA
-
SUX
1 stop8h 41m
United Airlines
Sun 3/16:46 pm
SUX
-
SEA
1 stop6h 13m
United Airlines
Deal found 2/11$404
This United Airlines deal was found by Cheapflights users on 2/12. 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.
Sat 2/143:25 pm
SEA
-
SUX
1 stop6h 17m
United Airlines
Sat 2/216:00 am
SUX
-
SEA
1 stop5h 49m
United Airlines
Deal found 2/12$424

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 February 12, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$317
(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

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 February 12, 2026.
Use the filters below to find and compare flights from Seattle to Sioux City that are best for you.

Fly from

Seattle

Fly to

Sioux City

Route

Depart

Return

Price

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 4/15

3:48 pm-11:44 pm

1 stop5h 56m

Sioux City Sioux Gateway

Wed 4/22

6:32 pm-10:56 pm

1 stop6h 24m

$274

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 4/15

11:35 am-11:44 pm

2 stops10h 09m

Sioux City Sioux Gateway

Fri 4/17

6:00 am-9:46 am

1 stop5h 46m

$327

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Wed 2/25

7:00 am-5:41 pm

1 stop8h 41m

Sioux City Sioux Gateway

Sun 3/1

6:46 pm-10:59 pm

1 stop6h 13m

$403

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Sat 2/28

7:00 am-5:41 pm

1 stop8h 41m

Sioux City Sioux Gateway

Sun 3/1

6:46 pm-10:59 pm

1 stop6h 13m

$404

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Sat 5/16

7:00 am-6:06 pm

1 stop9h 06m

Sioux City Sioux Gateway

Mon 5/18

6:42 pm-10:59 pm

1 stop6h 17m

$499

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Thu 5/21

7:00 am-5:32 pm

1 stop8h 32m

Sioux City Sioux Gateway

Sun 5/24

6:00 am-1:58 pm

2 stops9h 58m

$608

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/12

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 February.
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 $129). Flying from Seattle to Sioux City in May is currently the most expensive (average of $258). 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 February 12, 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
9,283 reviews

Food

6.6

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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
9,283 reviews
United Airlines
7.4
Good
9,283 reviews

Food

6.6

Crew

8.1

Overall

7.4

Boarding

7.7

Comfort

7.3

Entertainment

7.1

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 09m. 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 $129). Flying from Seattle to Sioux City in May is currently the most expensive (average of $258). 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 February 12, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$253Average$498FlexibilityNo cancel feeOn-time69%

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