What is the cheapest airline that flies from Sioux City Sioux Gateway to Seattle/Tacoma Intl?

United Airlines is the most popular carrier operating from Sioux City Sioux Gateway to Seattle/Tacoma Intl

What airlines fly to Seattle?

Alaska Airlines, United Airlines and American Airlines are the top three most popular airlines that fly to Seattle from Sioux City according to our data. Alaska Airlines is the first choice among our users, with 55% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 7 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport?

Prices for flights from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.

How old do you have to be to fly from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$133 Cheap Flights from Sioux City to Seattle in 2025/26

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0 bags

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Find the cheapest flights from Sioux City to Seattle

Round-trip

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Cheap round-trip flights

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1:00 pm - 7:03 pmSUX-SEA

8h 03m1 stop

12:55 pm - 9:39 amSEA-SUX

18h 44m1 stop

$381United Airlines

Find Deal

Tue, Mar 3 - Sat, Mar 7

1:00 pm - 12:59 amSUX-SEA

13h 59m2 stops

12:55 pm - 9:39 amSEA-SUX

18h 44m1 stop

$391United Airlines

Find Deal

Tue, Mar 3 - Sat, Mar 7

1:00 pm - 12:59 amSUX-SEA

13h 59m2 stops

12:35 pm - 4:32 pmSEA-SUX

25h 57m2 stops

$426United Airlines

Find Deal

Tue, Mar 3 - Sat, Mar 7

United Airlines flights from Sioux City to Seattle

Our best United Airlines deals on Sioux City to Seattle flight tickets

United Airlines

Mar 3

SUX1:00 pmSioux City Sioux Gateway

8h 03m

1 stop

SEA7:03 pmSeattle/Tacoma Intl

Mar 7

SEA12:55 pmSeattle/Tacoma Intl

18h 44m

1 stop

SUX9:39 amSioux City Sioux Gateway

$381

Find similar

United Airlines

Mar 3

SUX1:00 pmSioux City Sioux Gateway

13h 59m

2 stops

SEA12:59 amSeattle/Tacoma Intl

Mar 7

SEA12:55 pmSeattle/Tacoma Intl

18h 44m

1 stop

SUX9:39 amSioux City Sioux Gateway

$391

Find similar

United Airlines

Mar 3

SUX1:00 pmSioux City Sioux Gateway

13h 59m

2 stops

SEA12:59 amSeattle/Tacoma Intl

Mar 7

SEA12:35 pmSeattle/Tacoma Intl

25h 57m

2 stops

SUX4:32 pmSioux City Sioux Gateway

$426

Find similar

Fly from

Fly to

Route

Depart

Return

Price

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Tue 3/3

1:00 pm-7:03 pm

1 stop8h 03m

Seattle/Tacoma Intl

Sat 3/7

12:55 pm-9:39 am

1 stop18h 44m

$381

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Tue 3/3

1:00 pm-12:59 am

2 stops13h 59m

Seattle/Tacoma Intl

Sat 3/7

12:55 pm-9:39 am

1 stop18h 44m

$391

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Tue 3/3

1:00 pm-12:59 am

2 stops13h 59m

Seattle/Tacoma Intl

Sat 3/7

12:35 pm-4:32 pm

2 stops25h 57m

$426

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Sun 1/25

6:00 am-9:55 am

1 stop5h 55m

$133

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Sun 1/25

6:00 am-3:44 pm

2 stops11h 44m

$139

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Sun 1/25

6:43 pm-9:12 pm

3 stops28h 29m

$390

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

How to get the cheapest flight ticket from Sioux City to Seattle

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Sioux City is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $522. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Thursday is the most expensive day to depart from Sioux City because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $693.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Sioux City in the evening is the least expensive time of day to depart. momondo users have found prices as low as $516 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $564. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

When to book flights from Sioux City to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Sioux City to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Sioux City to Seattle (SUX to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Sioux City to Seattle

Direct flights	None

There are no direct flights from Sioux City to Seattle. There are no popular flight routes from Sioux City to Seattle.

Search flight deals

How far is Sioux City Sioux Gateway to Seattle/Tacoma Intl by plane?
There are 1306.6 mi between Sioux City Sioux Gateway and Seattle/Tacoma Intl. 8h 03m is a normal flight duration for this route.
When did momondo last update prices for flights from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport are refreshed on a daily basis.
How old do you have to be to fly from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Sioux City Sioux Gateway Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The necessary travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

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Why use momondo?

Why should I use momondo to find a flight deal from Sioux City to Seattle?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Sioux City.

Can I find flights from Sioux City to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Sioux City to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from Sioux City to Seattle?

Once all potential Sioux City to Seattle flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.

I’m not ready to book a flight from Sioux City to Seattle right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Seattle, momondo offers a useful price alert feature which will track prices for flights to Seattle from Sioux City and alert you when they change.