$345+ 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 9/15. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — SUX
Sep 20 — Sep 271
Round-trip
1 adult, Economy
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Find cheap flights from Seattle to Sioux City with Cheapflights
1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Seattle to Sioux City
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Best
Last-minute
Cheapest flights from Seattle to Sioux CityExplore 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 21, 2026.
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 21, 2026.
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/151:10 pm -
2 stops8h 33m
Tue 9/228:06 am -
1 stop10h 01m
Deal found 8/18![United Airlines logo]()
$345
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/25:00 am -
2 stops10h 53m
Sun 9/66:43 pm -
1 stop6h 21m
Deal found 8/18![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Mon 8/242:34 pm -
1 stop7h 09m
Mon 8/3111:30 am -
1 stop6h 22m
Deal found 8/20![United Airlines logo]()
$516
This United Airlines deal was found by Cheapflights users on 8/17. 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 8/257:00 am -
1 stop8h 53m
Wed 9/211:30 am -
1 stop6h 22m
Deal found 8/17![United Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 8/20. 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 10/203:55 pm -
1 stop5h 48m
Sat 10/248:35 am -
1 stop9h 30m
Deal found 8/20![United Airlines logo]()
$543
Best flights from Seattle to Sioux CityDiscover 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 August 21, 2026.
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 August 21, 2026.
This United Airlines deal was found by Cheapflights users on 8/19. 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 1/93:51 pm -
1 stop5h 51m
Wed 1/139:03 am -
2 stops13h 07m
Deal found 8/19![United Airlines logo]()
$419
This United Airlines deal was found by Cheapflights users on 8/21. 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.
Thu 10/293:49 pm -
1 stop5h 54m
Mon 11/26:45 pm -
1 stop17h 02m
Deal found 8/21![United Airlines logo]()
$517
This United Airlines deal was found by Cheapflights users on 8/20. 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 10/203:55 pm -
1 stop5h 48m
Sat 10/248:35 am -
1 stop9h 30m
Deal found 8/20![United Airlines logo]()
$543
This United Airlines deal was found by Cheapflights users on 8/18. 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 10/22:27 pm -
1 stop7h 16m
Sun 10/48:35 am -
1 stop27h 01m
Deal found 8/18![United Airlines logo]()
$583
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/113:54 pm -
1 stop5h 49m
Tue 9/156:35 pm -
1 stop17h 26m
Deal found 8/18![United Airlines logo]()
$593
Last-minute flights from Seattle to Sioux CityDiscover last-minute flight deals from Seattle to Sioux City. Data last updated August 21, 2026 and is based on user searches.
Discover last-minute flight deals from Seattle to Sioux City. Data last updated August 21, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 8/20. 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.
Mon 8/242:34 pm -
1 stop7h 09m
Mon 8/3111:30 am -
1 stop6h 22m
Deal found 8/20![United Airlines logo]()
$516
This United Airlines deal was found by Cheapflights users on 8/17. 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 8/257:00 am -
1 stop8h 53m
Wed 9/211:30 am -
1 stop6h 22m
Deal found 8/17![United Airlines logo]()
$519
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/25:00 am -
2 stops10h 53m
Sun 9/66:43 pm -
1 stop6h 21m
Deal found 8/18![United Airlines logo]()
$444
This United Airlines deal was found by Cheapflights users on 8/18. 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 9/151:10 pm -
2 stops8h 33m
Tue 9/228:06 am -
1 stop10h 01m
Deal found 8/18![United Airlines logo]()
$345
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 21, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $345 (United Airlines) |
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 7,457,451 searches. Data last updated August 21, 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
Cheapest round-trip
SeattleSioux City
SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway
SEASUX
Seattle/Tacoma Intl
Sat 1/9
3:51 pm-11:42 pm
1 stop5h 51m
Sioux City Sioux Gateway
Wed 1/13
9:03 am-8:10 pm
2 stops13h 07m
$419
SeattleSioux City
SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway
SEASUX
Seattle/Tacoma Intl
Thu 10/29
3:49 pm-11:43 pm
1 stop5h 54m
Sioux City Sioux Gateway
Mon 11/2
6:45 pm-9:47 am
1 stop17h 02m
$517
Quickest round-trip
SeattleSioux City
SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway
SEASUX
Seattle/Tacoma Intl
Tue 10/20
3:55 pm-11:43 pm
1 stop5h 48m
Sioux City Sioux Gateway
Sat 10/24
8:35 am-4:05 pm
1 stop9h 30m
$543
SeattleSioux City
SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway
SEASUX
Seattle/Tacoma Intl
Fri 10/2
2:27 pm-11:43 pm
1 stop7h 16m
Sioux City Sioux Gateway
Sun 10/4
8:35 am-9:36 am
1 stop27h 01m
$583
SeattleSioux City
SEA Seattle/Tacoma Intl - SUX Sioux City Sioux Gateway
SEASUX
Seattle/Tacoma Intl
Fri 9/11
3:54 pm-11:43 pm
1 stop5h 49m
Sioux City Sioux Gateway
Tue 9/15
6:35 pm-10:01 am
1 stop17h 26m
$593
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.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- 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.
SEA-SUX
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 21, 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.
Overall
7.4
Boarding
7.7
Crew
8.1
Comfort
7.3
Food
6.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
Overall
7.4
Boarding
7.7
Crew
8.1
Comfort
7.3
Food
6.7
Entertainment
7.1
Reviews
1 / 20
4.0
OkayChris,Aug 2026
MIA - ORD
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.
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Complete your trip
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Seattle and Sioux City flights
Browse other Seattle and Sioux City flight options. Last updated on August 21, 2026.
Other flights from Seattle
Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on August 21, 2026.
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Other flights to Sioux City
Explore flights to Sioux City departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on August 21, 2026.
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 7,457,451 searches. Data last updated August 21, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$253 | Average$486 | FlexibilityNo cancel fee | On-time69% |