How long does it take to fly to Seattle?

Flight times vary depending on what airport in Illinois you fly out of and what airport in Seattle you fly into. For example, flying from Chicago to Seattle takes 4h 33m on average. On the other hand, flying from Moline to Seattle takes 7h 13m on average. Keep in mind that it’s always quicker to opt for a non-stop flight, so be sure to check momondo if there are any available for your route.

How many flights depart from Illinois to Seattle on average per week?

As of November 2025, there are 262 flights per week flying from Illinois to Seattle. The most common day of the week flights depart is Fri, with 24% of flights taking off on this day.

What airlines fly to Seattle?

Alaska Airlines, American Airlines and Delta are the top three most popular airlines that fly to Seattle from Illinois according to our data. Alaska Airlines is the first choice among our users, with 31% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 8 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

What is the cheapest airline that flies from Illinois to Seattle/Tacoma Intl?

Frontier, Southwest, and American Airlines are the most popular carriers operating from Illinois to Seattle/Tacoma Intl

How many flights depart from Illinois to Seattle on average per day?

37 flights are operational daily from Illinois to Seattle as of November 2025. The most popular departure time for this route is 8:00PM, with 45% of flights per day taking off in the evening.

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

Prices for flights from Illinois to Seattle/Tacoma Intl Airport refresh daily.

How many operators does momondo search for flights from Illinois to Seattle/Tacoma Intl Airport?

As of November 2025, there are 8 operators available to choose from for flights from Illinois to Seattle/Tacoma Intl Airport.

How old do you have to be to fly from Illinois 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 Illinois to Seattle/Tacoma Intl Airport.

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

The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.

$64 Cheap Flights from Illinois to Seattle in 2025/26

1 adult

0 bags

Discover deals from 900+ travel sites with momondo.

Save money when you book flights with momondo

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Free Wi-Fi? Stopover? Instantly customize your results.

Trusted and free

We’re completely free to use - no hidden charges or fees.

Price Alerts

Not ready to book? to track prices.

Search flight deals

Find the cheapest flights from Illinois to Seattle

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

10:35 am - 1:15 pmMDW-SEA

4h 40mnonstop

6:45 am - 12:40 pmSEA-MDW

3h 55mnonstop

$177Southwest

Find Deal

Thu, Jan 8 - Wed, Jan 14

7:54 pm - 10:43 pmORD-SEA

4h 49mnonstop

7:00 am - 1:08 pmSEA-ORD

4h 08mnonstop

$177United Airlines

Find Deal

Fri, Jan 9 - Sun, Jan 11

6:00 am - 8:45 amORD-SEA

4h 45mnonstop

11:00 am - 5:10 pmSEA-ORD

4h 10mnonstop

$178Hawaiian Airlines

Find Deal

Mon, Jan 5 - Mon, Jan 12

9:02 am - 11:45 amORD-SEA

4h 43mnonstop

10:40 am - 4:43 pmSEA-ORD

4h 03mnonstop

$179United Airlines

Find Deal

Thu, Dec 4 - Tue, Dec 9

7:50 am - 10:41 amORD-SEA

4h 51mnonstop

5:55 pm - 11:59 pmSEA-ORD

4h 04mnonstop

$180Delta

Find Deal

Sun, Dec 14 - Tue, Dec 16

1:50 pm - 8:38 pmMDW-SEA

8h 48m1 stop

2:03 pm - 11:47 pmSEA-MDW

7h 44m1 stop

$183Delta

Find Deal

Sat, Dec 13 - Tue, Dec 16

4:22 pm - 12:10 amORD-SEA

33h 48m2 stops

1:25 pm - 12:12 amSEA-ORD

8h 47m1 stop

$184Frontier

Find Deal

Tue, Dec 16 - Wed, Dec 24

2:06 pm - 6:43 pmORD-SEA

6h 37m1 stop

5:50 pm - 11:50 pmSEA-ORD

4h 00mnonstop

$185Alaska Airlines

Find Deal

Fri, Jan 23 - Sun, Jan 25

2:06 pm - 6:43 pmORD-SEA

6h 37m1 stop

10:32 am - 11:37 pmSEA-ORD

11h 05m1 stop

$186Alaska Airlines

Find Deal

Thu, Jan 8 - Wed, Jan 14

10:16 pm - 9:04 amSTL-SEA

12h 48m1 stop

9:10 pm - 6:32 pmSEA-STL

19h 22m2 stops

$216Frontier

Find Deal

Fri, Jan 9 - Thu, Jan 15

Alaska Airlines flights from Illinois to Seattle

Our best Alaska Airlines deals on Illinois to Seattle flight tickets

Alaska Airlines

Jan 8

ORD2:06 pmChicago O'Hare Intl

6h 37m

1 stop

SEA6:43 pmSeattle/Tacoma Intl

Jan 14

SEA10:32 amSeattle/Tacoma Intl

11h 05m

1 stop

ORD11:37 pmChicago O'Hare Intl

$186

Find similar

Alaska Airlines

Jan 8

ORD6:06 pmChicago O'Hare Intl

4h 50m

SEA8:56 pmSeattle/Tacoma Intl

Jan 11

SEA9:45 pmSeattle/Tacoma Intl

13h 25m

1 stop

ORD1:10 pmChicago O'Hare Intl

$187

Find similar

Alaska Airlines

Dec 11

ORD5:51 pmChicago O'Hare Intl

4h 44m

SEA8:35 pmSeattle/Tacoma Intl

Dec 14

SEA5:50 pmSeattle/Tacoma Intl

4h 09m

ORD11:59 pmChicago O'Hare Intl

$195

Find similar

Southwest flights from Illinois to Seattle

Our best Southwest deals on Illinois to Seattle flight tickets

Southwest

Jan 8

MDW10:35 amChicago Midway

4h 40m

SEA1:15 pmSeattle/Tacoma Intl

Jan 14

SEA6:45 amSeattle/Tacoma Intl

3h 55m

MDW12:40 pmChicago Midway

$177

Find similar

Southwest

Jan 8

MDW10:35 amChicago Midway

4h 40m

SEA1:15 pmSeattle/Tacoma Intl

Jan 14

SEA6:05 amSeattle/Tacoma Intl

8h 40m

1 stop

MDW4:45 pmChicago Midway

$187

Find similar

Southwest

Jan 9

MDW10:35 amChicago Midway

4h 40m

SEA1:15 pmSeattle/Tacoma Intl

Jan 15

SEA8:35 amSeattle/Tacoma Intl

9h 05m

2 stops

MDW7:40 pmChicago Midway

$192

Find similar

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Thu 1/8

10:35 am-1:15 pm

Nonstop4h 40m

Seattle/Tacoma Intl

Wed 1/14

6:45 am-12:40 pm

Nonstop3h 55m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 1/9

7:54 pm-10:43 pm

Nonstop4h 49m

Seattle/Tacoma Intl

Sun 1/11

7:00 am-1:08 pm

Nonstop4h 08m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 1/5

6:00 am-8:45 am

Nonstop4h 45m

Seattle/Tacoma Intl

Mon 1/12

11:00 am-5:10 pm

Nonstop4h 10m

$178

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 12/4

9:02 am-11:45 am

Nonstop4h 43m

Seattle/Tacoma Intl

Tue 12/9

10:40 am-4:43 pm

Nonstop4h 03m

$179

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sun 12/14

7:50 am-10:41 am

Nonstop4h 51m

Seattle/Tacoma Intl

Tue 12/16

5:55 pm-11:59 pm

Nonstop4h 04m

$180

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Sat 12/13

1:50 pm-8:38 pm

1 stop8h 48m

Seattle/Tacoma Intl

Tue 12/16

2:03 pm-11:47 pm

1 stop7h 44m

$183

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 12/16

4:22 pm-12:10 am

2 stops33h 48m

Seattle/Tacoma Intl

Wed 12/24

1:25 pm-12:12 am

1 stop8h 47m

$184

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 1/23

2:06 pm-6:43 pm

1 stop6h 37m

Seattle/Tacoma Intl

Sun 1/25

5:50 pm-11:50 pm

Nonstop4h 00m

$185

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 1/8

2:06 pm-6:43 pm

1 stop6h 37m

Seattle/Tacoma Intl

Wed 1/14

10:32 am-11:37 pm

1 stop11h 05m

$186

St. LouisSeattle

STL - SEA

STLSEA

Lambert-St Louis

Fri 1/9

10:16 pm-9:04 am

1 stop12h 48m

Seattle/Tacoma Intl

Thu 1/15

9:10 pm-6:32 pm

2 stops19h 22m

$216

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Illinois 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

Other information

What is the cheapest month to fly to Seattle?

In general, February is the cheapest month to fly from Illinois to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $219. If you don’t want to visit Seattle in February, then you should wait until April to fly from Illinois, when ticket prices are also cheap, with an average price of $233.

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

On average, the least expensive day to fly to Seattle from Illinois is on a Wednesday. momondo users have found tickets for Wednesday departures for as low as $337. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Sunday is the most expensive day to depart from Illinois because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $457.

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

Flying to Seattle from Illinois in the evening is the least expensive time of day to depart. momondo users have found prices as low as $323 when looking at flights departing in the evening. Flights to Seattle are more costly in the morning, with an average ticket price of $376. Departure times in the morning fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Illinois to Seattle/Tacoma Intl flight route?

Fly from Chicago O'Hare Intl to Seattle/Tacoma Intl for the best Illinois - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

You are more likely to see cheaper flights to Seattle from Illinois when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $289 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Illinois for as low as $251 on momondo.

What cabin class options are available on Illinois to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Illinois to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Seattle flights?

You could potentially save up to 8% on your flight if you consider stops on a Illinois to Seattle flight.

Cheap Illinois to Seattle flight deals and tips

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

Best Price Found	$164
Fastest flight time	4h 17m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Illinois in the past 72 hours is $164. The best round-trip flight deal from Illinois to Seattle found on momondo in the last 72 hours is $252.

The fastest flight from Illinois to Seattle takes 4h 17m

Direct flights go from Illinois to Seattle every day.

There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)

Search flight deals

When did momondo last update prices for flights from Illinois to Seattle/Tacoma Intl Airport?
Prices for flights from Illinois to Seattle/Tacoma Intl Airport refresh daily.
How many operators does momondo search for flights from Illinois to Seattle/Tacoma Intl Airport?
As of November 2025, there are 8 operators available to choose from for flights from Illinois to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Illinois 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 Illinois to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The required travel and health documents for your Seattle/Tacoma Intl Airport trip may vary depending on your itinerary and personal circumstances. As a general rule, you should carry multiple documents, including a national ID card or driver's license and a passport valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. We recommend that you seek guidance from your airline or a reliable third party such as IATA.
What is the most popular plane model from Illinois to Seattle?
momondo data reveals that the most frequently booked plane model on the route from Illinois to Seattle is Boeing 737-800, representing 20.65% of all bookings. The subsequent popular models are Boeing 737-900 Passenger/BBJ3 (winglets) at 16.59%, Boeing 737 MAX 9 at 13.79%, and Airbus A321neo at 12.34%.

Best airlines flying from Illinois to Seattle

Compare and see reviews for airlines that fly from Illinois to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Hawaiian Airlines	PriceFrom $91	Free Cancellation	Rating 7.8 2,813 reviews	Search Hawaiian Airlines flights
Spirit Airlines	PriceFrom $105	Free Cancellation	Rating 6.3 8,160 reviews	Search Spirit Airlines flights
Delta	PriceFrom $122	Free Cancellation	Rating 7.9 8,001 reviews	Search Delta flights
Frontier	PriceFrom $142	Free Cancellation	Rating 5.8 3,101 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 8.0 11,329 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $173	Free Cancellation	Rating 7.2 11,047 reviews	Search American Airlines flights
United Airlines	PriceFrom $176	Free Cancellation	Rating 7.4 9,033 reviews	Search United Airlines flights
Southwest	PriceFrom $189	Free Cancellation	Rating 8.0 4,252 reviews	Search Southwest flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Redmond

Tukwila

Lakewood

Federal Way

Fife

Cle Elum

Centralia

Kirkland

Westport

Shoreline

Why use momondo?

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

Finding the right flight to Seattle from Illinois is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Seattle quick and easy, saving you time and money.

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

Yes. momondo enables you to select and highlight flights to Seattle from Illinois with this policy.

How can momondo help me find flights from Illinois to Seattle?

Once you have performed a search for Illinois to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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

If you are not ready to book a flight from Illinois to Seattle now, use our insights above to find helpful tips or alternatively set up a price alert, where momondo will track prices on flights to Seattle and let you know when they change.

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Start using Trips

Find my bookings

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

1 adult

Mon 12/22

Mon 12/29

Email me momondo's favorite deals

By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States

Cheap flights from Illinois to Seattle from $64

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Illinois to Seattle departing on 2/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

Big names and deals

Big names and deals

Filter for what you want

Filter for what you want

Trusted and free

Trusted and free

Price Alerts

Price Alerts

Find the cheapest flights from Illinois to Seattle

Cheap round-trip flights

Cheap one-way flights

Cheap last minute flights

Cheap direct flights

Alaska Airlines flights from Illinois to Seattle

Our best Alaska Airlines deals on Illinois to Seattle flight tickets

Southwest flights from Illinois to Seattle

Our best Southwest deals on Illinois to Seattle flight tickets

momondo Fare Finder

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

See travel insights to Seattle from

How to get the cheapest flight ticket from Illinois 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

What is the cheapest month to fly to Seattle?

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

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

What is the cheapest Illinois to Seattle/Tacoma Intl flight route?

Fly from Chicago O'Hare Intl to Seattle/Tacoma Intl for the best Illinois - Seattle/Tacoma Intl flight prices

How far in advance should I book a flight to Seattle?

What cabin class options are available on Illinois to Seattle/Tacoma Intl flights?

There are 4 cabin classes available to choose from on Illinois to Seattle/Tacoma Intl flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Illinois to Seattle flights?

You could potentially save up to 8% on your flight if you consider stops on a Illinois to Seattle flight.

What is the cheapest airline that flies from Illinois to Seattle/Tacoma Intl?

Frontier, Southwest, and American Airlines are the most popular carriers operating from Illinois to Seattle/Tacoma Intl

What airlines fly to Seattle?

How many flights depart from Illinois to Seattle on average per day?

37 flights are operational daily from Illinois to Seattle as of November 2025. The most popular departure time for this route is 8:00PM, with 45% of flights per day taking off in the evening.

How many flights depart from Illinois to Seattle on average per week?

As of November 2025, there are 262 flights per week flying from Illinois to Seattle. The most common day of the week flights depart is Fri, with 24% of flights taking off on this day.

How long does it take to fly to Seattle?

Cheap Illinois to Seattle flight deals and tips

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

Best Price Found

Fastest flight time

Direct flights

Airports in Seattle

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

How many operators does momondo search for flights from Illinois to Seattle/Tacoma Intl Airport?

How old do you have to be to fly from Illinois to Seattle/Tacoma Intl Airport?

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

What is the most popular plane model from Illinois to Seattle?

Best airlines flying from Illinois to Seattle

Compare and see reviews for airlines that fly from Illinois to Seattle with momondo

Traveling to a place near Seattle?

Why use momondo?

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

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

How can momondo help me find flights from Illinois to Seattle?

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

An easier way to manage your Seattle trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to the United States

Airports servicing Washington