$394+ 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
Oct 12 — Oct 191
Round-trip
1 adult, Economy
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Find cheap flights from Sioux City to Seattle 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 Sioux City to Seattle
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Best
Last-minute
Cheapest flights from Sioux City to SeattleExplore 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 September 12, 2026.
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 September 12, 2026.
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 9/256:58 pm -
1 stop6h 01m
Tue 9/297:00 am -
1 stop8h 53m
Deal found 9/10![United Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 10/208:35 am -
2 stops14h 02m
Sat 10/243:55 pm -
1 stop5h 48m
Deal found 9/11![United Airlines logo]()
$439
This United Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 10/86:58 pm -
1 stop6h 01m
Tue 10/137:00 am -
1 stop8h 53m
Deal found 9/12![United Airlines logo]()
$530
Best flights from Sioux City to SeattleDiscover carefully curated flight deals from Sioux City to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
Discover carefully curated flight deals from Sioux City to Seattle that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 12, 2026.
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 9/256:58 pm -
1 stop6h 01m
Tue 9/297:00 am -
1 stop8h 53m
Deal found 9/10![United Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 10/208:35 am -
2 stops14h 02m
Sat 10/243:55 pm -
1 stop5h 48m
Deal found 9/11![United Airlines logo]()
$439
Last-minute flights from Sioux City to SeattleDiscover last-minute flight deals from Sioux City to Seattle. Data last updated September 12, 2026 and is based on user searches.
Discover last-minute flight deals from Sioux City to Seattle. Data last updated September 12, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/10. 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.
Fri 9/256:58 pm -
1 stop6h 01m
Tue 9/297:00 am -
1 stop8h 53m
Deal found 9/10![United Airlines logo]()
$394
This United Airlines deal was found by Cheapflights users on 9/12. 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.
Thu 10/86:58 pm -
1 stop6h 01m
Tue 10/137:00 am -
1 stop8h 53m
Deal found 9/12![United Airlines logo]()
$530
This United Airlines deal was found by Cheapflights users on 9/11. 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.
Tue 10/208:35 am -
2 stops14h 02m
Sat 10/243:55 pm -
1 stop5h 48m
Deal found 9/11![United Airlines logo]()
$439
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 September 12, 2026.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | FlightHub 3 stars |
Round-trip from | $394 (United Airlines) |
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 7,457,451 searches. Data last updated September 12, 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
Cheapest round-trip
Quickest round-trip
Sioux CitySeattle
SUX Sioux City Sioux Gateway - SEA Seattle/Tacoma Intl
SUXSEA
Sioux City Sioux Gateway
Fri 9/25
6:58 pm-10:59 pm
1 stop6h 01m
Seattle/Tacoma Intl
Tue 9/29
7:00 am-5:53 pm
1 stop8h 53m
$394
Sioux CitySeattle
SUX Sioux City Sioux Gateway - SEA Seattle/Tacoma Intl
SUXSEA
Sioux City Sioux Gateway
Tue 10/20
8:35 am-8:37 pm
2 stops14h 02m
Seattle/Tacoma Intl
Sat 10/24
3:55 pm-11:43 pm
1 stop5h 48m
$439
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 September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy1 star | Trust Score*3 stars |
- 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.
SUX-SEA
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.
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.
Traveling to a place near Seattle?
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