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Sioux City

$414+ 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 10/2. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SUX
Sep 9 — Sep 161
Wed 9/9
Wed 9/16
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 August 10, 2026.

This United Airlines deal was found by Cheapflights users on 8/9. 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 9/253:55 pm -
1 stop5h 48m
Wed 9/306:58 pm -
1 stop6h 01m
Deal found 8/9$414
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/257:00 am -
1 stop8h 53m
Mon 9/286:58 pm -
1 stop6h 01m
Deal found 8/9$415
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/273:54 pm -
1 stop5h 49m
Sat 8/299:05 am -
2 stops13h 38m
Deal found 8/6$424
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/252:27 pm -
1 stop7h 16m
Sat 9/268:35 am -
3 stops16h 52m
Deal found 8/9$429
This United Airlines deal was found by Cheapflights users on 8/6. 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 10/27:00 am -
1 stop8h 53m
Sun 10/48:35 am -
2 stops14h 02m
Deal found 8/6$454
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/143:54 pm -
1 stop5h 49m
Fri 8/286:43 pm -
1 stop6h 21m
Deal found 8/6$514
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/252:27 pm -
1 stop7h 16m
Tue 9/296:58 pm -
1 stop28h 17m
Deal found 8/9$517
This United Airlines deal was found by Cheapflights users on 8/9. 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 9/252:27 pm -
1 stop7h 16m
Thu 10/18:35 am -
2 stops14h 02m
Deal found 8/9$519
This United Airlines deal was found by Cheapflights users on 8/6. 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 8/143:54 pm -
1 stop5h 49m
Sat 8/2911:30 am -
2 stops8h 59m
Deal found 8/6$524

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 August 10, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$414
(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 August 10, 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 Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Fri 10/2

7:00 am-5:53 pm

1 stop8h 53m

Sioux City Sioux Gateway

Sun 10/4

8:35 am-4:05 pm

1 stop9h 30m

$414

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Thu 8/27

10:55 am-11:43 pm

2 stops10h 48m

Sioux City Sioux Gateway

Sat 8/29

9:05 am-8:43 pm

2 stops13h 38m

$509

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Fri 9/25

2:27 pm-11:43 pm

1 stop7h 16m

Sioux City Sioux Gateway

Thu 10/1

8:35 am-8:37 pm

2 stops14h 02m

$519

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Fri 9/25

2:27 pm-11:43 pm

1 stop7h 16m

Sioux City Sioux Gateway

Wed 9/30

6:58 pm-7:29 pm

2 stops26h 31m

$532

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Tue 8/25

7:00 am-5:53 pm

1 stop8h 53m

Sioux City Sioux Gateway

Sat 8/29

11:30 am-8:43 pm

2 stops11h 13m

$574
Quickest round-trip

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Tue 9/1

7:00 am-5:53 pm

1 stop8h 53m

Sioux City Sioux Gateway

Sat 9/5

11:30 am-5:42 pm

1 stop8h 12m

$613

SeattleSioux City

SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway

SEASUX

Seattle/Tacoma Intl

Sat 9/5

5:00 am-10:55 am

1 stop27h 55m

Sioux City Sioux Gateway

Fri 9/11

6:35 pm-8:43 pm

2 stops28h 08m

$630

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/6

Sorted by cheapest first

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 August.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 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 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.

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 August 10, 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
10,099 reviews

Boarding

7.7

Entertainment

7.1

Food

6.7

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible
United Airlines
7.4
Good
10,099 reviews
United Airlines
7.4
Good
10,099 reviews

Boarding

7.7

Entertainment

7.1

Food

6.7

Comfort

7.3

Crew

8.1

Overall

7.4

Reviews

1 / 20
2.0
Mediocre

Dawn,Aug 2026

ORD - DEN

I missed my connecting flight because our plane took off ten minutes late and then when we got to the airport another plane was in our shoot waiting to get fueled up and that took 30 minutes so I missed my connecting flight. I asked if I could get off and they assured me the plane would most likely wait for me since they know what time the planes get in because of an app. I was not happy. I had to wait till 7:25 to board the next flight and then that was delayed. Gates changed till 9:20. Terrible

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 8h 53m. Fly via United Airlines to get the fastest option. Airlines will cover a distance of 1308 mi.

  • 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.

See more FAQs

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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 August 10, 2026.
AirlineCheapestAverageFlexibilityOn-time
United AirlinesCheapest$253Average$414FlexibilityNo cancel feeOn-time69%

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