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

United Airlines, at $381, was found to be the cheapest airline from Sioux City to Seattle..

What is the cheapest day to fly from Sioux City to Seattle?

Travelers seeking maximum savings on their Sioux City to Seattle flight should consider departing on Saturday mornings when fares are most often at their lowest. Saturday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

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

Leaving on a Monday is a viable option for saving on travel. Heavily demanded days of the week can typically drive up the prices you see. Booking your travel for a less competitive day can save up to 32% on the overall cost on flights 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.

$263+ Flights from Sioux City to Seattle

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Cheap flight deals from Sioux City to Seattle

Round-trip from	$381 (United Airlines)
One-way from	$263 (United Airlines)

From Sioux City Sioux Gateway to Seattle/Tacoma Intl

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One-way flight from Sioux City Sioux Gateway to Seattle/Tacoma Intl

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Find 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 11, 2025.

Wed 8/136:53 pmSUX - SEA

1 stop6h 06mUnited Airlines

Sun 8/176:45 amSEA - SUX

2 stops9h 33mUnited Airlines

Deal found 7/8

$381

Best flights from Sioux City to Seattle
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 July 11, 2025.

Wed 8/136:53 pmSUX - SEA

1 stop6h 06mUnited Airlines

Sun 8/176:45 amSEA - SUX

2 stops9h 33mUnited Airlines

Deal found 7/8

$381

Last-minute flights from Sioux City to Seattle
Discover last-minute flight deals from Sioux City to Seattle. Data last updated July 11, 2025 and is based on user searches.

Wed 8/136:53 pmSUX - SEA

1 stop6h 06mUnited Airlines

Sun 8/176:45 amSEA - SUX

2 stops9h 33mUnited Airlines

Deal found 7/8

$381

One-way flights from Sioux City to Seattle
Search for one-way flight options from Sioux City to Seattle. Find affordable one-way fares based on user searches. Data last updated July 11, 2025.

Sat 8/910:10 amSUX - SEA

1 stop15h 49mUnited Airlines

Deal found 7/10

$263

Cheapflights Fare Finder

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

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Wed 8/13

6:53 pm-10:59 pm

1 stop6h 06m

Seattle/Tacoma Intl

Sun 8/17

6:45 am-6:18 pm

2 stops9h 33m

$381

Sioux CitySeattle

SUX - SEA

SUXSEA

Sioux City Sioux Gateway

Sat 8/9

10:10 am-11:59 pm

1 stop15h 49m

$263

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/10

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.

Cheapflights Insights

Everything you need to know about your flight from Sioux City to Seattle

What is the cheapest month to book a flight from Sioux City to Seattle?

Currently, January is the cheapest month in which you can book a flight from Sioux City to Seattle (average of $238). Flying from Sioux City to Seattle in June is currently the most expensive (average of $388). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SUX to SEA?

One of the essential ways to save on airfare from Sioux City to Seattle is to remain as flexible as possible. Flights that are in the morning tend to be the most expensive. A flight at noon could potentially save you up to 9% on airfare.

Reviews of airlines servicing Seattle

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

8,846 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

United Airlines

7.4

Good

8,846 reviews

United Airlines

7.4

Good

8,846 reviews

Reviews

1 / 20

2.0

Mediocre

Deb,Jan 2025

MKE - ORD

It was terrible! So much to say, but in a nutshell we used vouchers from United because our last trip with them was awful with many mishaps and errors made. Unfortunately, this trip was even worse!

Related info for your journey

What is the cheapest airline to fly from Sioux City to Seattle round-trip?
United Airlines, at $381, 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.
What is the cheapest month to book a flight from Sioux City to Seattle?
Currently, January is the cheapest month in which you can book a flight from Sioux City to Seattle (average of $238). Flying from Sioux City to Seattle in June is currently the most expensive (average of $388). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

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$263+ Cheap flights from Sioux City to Seattle (SUX - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/9. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Sioux City to Seattle with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Sioux City to Seattle

Round-trip from

One-way from

Find flight deals from Sioux City to Seattle

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 July 11, 2025.

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 11, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Sioux City to Seattle that are best for you.

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.

Cheapflights Insights

Everything you need to know about your flight from Sioux City to Seattle

What is the cheapest month to book a flight from Sioux City to Seattle?

What is the cheapest time of day to fly from SUX to SEA?

Find hourly flight availability from Sioux City to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 11, 2025.

Reviews of airlines servicing Seattle

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.

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.

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

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

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

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

What is the cheapest month to book a flight from Sioux City to Seattle?

Traveling to a place near Sioux City?

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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 11, 2025.