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$354+ Cheap flights from Sioux City to Seattle (SUX - SEA)

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 9/25. Fares are subject to change and may not be available on all flights or dates of travel.
SUX — SEA
Aug 26 — Sep 21
Wed 8/26
Wed 9/2
1 adult, Economy
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Cheap flight deals from Sioux City to Seattle

Cheapest flights from Sioux City to Seattle
Explore the most affordable flight options available from Sioux City to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 27, 2026.

This United Airlines deal was found by Cheapflights users on 7/24. 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.
Fri 9/256:58 pm
SUX
-
SEA
1 stop6h 01m
United Airlines
Sat 10/33:55 pm
SEA
-
SUX
1 stop5h 48m
United Airlines
Deal found 7/24$354
This United Airlines deal was found by Cheapflights users on 7/21. 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 8/2911:30 am
SUX
-
SEA
2 stops11h 13m
United Airlines
Tue 9/15:00 am
SEA
-
SUX
1 stop27h 55m
United Airlines
Deal found 7/21$517
This United Airlines deal was found by Cheapflights users on 7/24. 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 10/86:58 pm
SUX
-
SEA
1 stop6h 01m
United Airlines
Mon 10/127:00 am
SEA
-
SUX
1 stop8h 53m
United Airlines
Deal found 7/24$533
This United Airlines deal was found by Cheapflights users on 7/25. 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.
Sun 8/96:35 pm
SUX
-
SEA
1 stop6h 35m
United Airlines
Thu 8/136:15 pm
SEA
-
SUX
1 stop27h 28m
United Airlines
Deal found 7/25$699

Find flight deals from Sioux City to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Sioux City (SUX) to Seattle (SEA). 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 July 27, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$354
(United Airlines)
Provider with most accurate pricing for Sioux City Sioux Gateway-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Sioux City Sioux Gateway-Seattle/Tacoma Intl flights.
Search Deals
From Sioux City Sioux Gateway to Seattle/Tacoma Intl
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Sioux City to Seattle 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 July 27, 2026.
Use the filters below to find and compare flights from Sioux City to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip
Quickest round-trip

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Fri 9/25

6:58 pm-10:59 pm

1 stop6h 01m

Seattle/Tacoma Intl

Sat 10/3

3:55 pm-11:43 pm

1 stop5h 48m

$354

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Thu 10/8

6:58 pm-10:59 pm

1 stop6h 01m

Seattle/Tacoma Intl

Mon 10/12

6:05 pm-11:43 pm

1 stop27h 38m

$533
Cheapest one-way
Quickest one-way

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Mon 8/3

8:10 am-4:09 pm

1 stop9h 59m

$373

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/23

Sorted by cheapest first

Compare providers for flights from Sioux City to Seattle

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 Sioux City to Seattle in July.
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 Sioux City-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Sioux City-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Sioux City-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Sioux City-Seattle 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 Sioux City-Seattle 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 Sioux City to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Sioux City 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 Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated July 27, 2026.
See what other customers who have flown with United Airlines from Sioux City to Seattle 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
10,041 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this
United Airlines
7.4
Good
10,041 reviews
United Airlines
7.4
Good
10,041 reviews

Entertainment

7.1

Crew

8.1

Overall

7.4

Comfort

7.3

Boarding

7.7

Food

6.6

Reviews

1 / 20
6.0
Good

ROHIT,Jun 2026

IND - EWR

It should not be delayed by 2 hours. I missed the important event due to this

Related info for your journey

Find useful and relevant information for your journey from Sioux City to Seattle. 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 Sioux City to Seattle?

    Airlines like United Airlines fly from Sioux City to Seattle in about 6h 01m. The time it takes to get you to your destination can typically vary by up to . Sioux City and Seattle are separated by a distance of 1308 mi.

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

    United Airlines, at $260, was found to be the cheapest airline from Sioux City to Seattle..

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Sioux City to Seattle 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

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
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Tumwater
Tukwila
Centralia
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