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Sioux City

$267+ 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 1/22. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SUX
Jan 26 — Feb 21
Mon 1/26
Mon 2/2
1 adult, Economy
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Cheap flight deals from Seattle to Sioux City

Best flights from Seattle to Sioux City
Discover carefully curated flight deals from Seattle to Sioux City that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated December 27, 2025.

This United Airlines deal was found by Cheapflights users on 12/25. 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 1/223:30 pmSEA - SUX
1 stop6h 17mUnited Airlines
Thu 1/296:00 amSUX - SEA
2 stops11h 44mUnited Airlines
Deal found 12/25$267
This United Airlines deal was found by Cheapflights users on 12/24. 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.
Sat 1/317:00 amSEA - SUX
1 stop8h 28mUnited Airlines
Sun 2/16:00 amSUX - SEA
1 stop5h 55mUnited Airlines
Deal found 12/24$332

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 December 27, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$267
(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 December 27, 2025.
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

Thu 1/22

3:30 pm-11:47 pm

1 stop6h 17m

Sioux City Sioux Gateway

Thu 1/29

6:00 am-3:44 pm

2 stops11h 44m

$267

SeattleSioux City

SEA - SUX

SEASUX

Seattle/Tacoma Intl

Sat 1/31

7:00 am-5:28 pm

1 stop8h 28m

Sioux City Sioux Gateway

Sun 2/1

6:00 am-9:55 am

1 stop5h 55m

$332

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/25

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 December.
ProviderPrice AccuracyTrust Score*
FlightHubPrice Accuracy3 starsTrust Score*1 star
eDreamsPrice Accuracy3 starsTrust Score*3 stars
ExpediaPrice Accuracy2 starsTrust 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 eDreams to be most consistent on Cheapflights vs. eDreams Users can find the same prices on Seattle-Sioux City flight deals on Cheapflights vs. eDreams >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 eDreams the most. eDreams 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 $138). Flying from Seattle to Sioux City in December is currently the most expensive (average of $265). 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 December 27, 2025.
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
9,113 reviews

Crew

8.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.
United Airlines
7.4
Good
9,113 reviews
United Airlines
7.4
Good
9,113 reviews

Crew

8.1

Comfort

7.3

Overall

7.4

Boarding

7.7

Food

6.6

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Michelle,Dec 2025

DEN - MKE

I liked that the plane waited 5 minutes for a family whose incoming plane was late. This was the last flight of the day to MKE. Flight attendants actually checked in throughout the flight. Although, not really friendly. Happy to see screens on seat backs again. This is my first time not flying first class in over 10 years. It was economy plus.

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 6h 17m. 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 $138). Flying from Seattle to Sioux City in December is currently the most expensive (average of $265). 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.

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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 December 27, 2025.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$253Average$453FlexibilityNo cancel feeOn-time69%

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