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

36 flights are operational daily from Illinois to Seattle as of October 2025. The most popular departure time for this route is 5:00PM, with 47% of flights per day taking off in the afternoon.

What airlines fly to Seattle?

Alaska Airlines, Delta and American Airlines 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 32% 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 Delta are the most popular carriers operating from Illinois to Seattle/Tacoma Intl

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

As of October 2025, there are 256 flights per week flying from Illinois to Seattle. The most common day of the week flights depart is Sat, with 25% of flights taking off on this day.

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 28m on average. On the other hand, flying from Moline to Seattle takes 7h 01m 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.

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 October 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.

$83 Cheap Flights from Illinois to Seattle in 2025/26

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Cheap round-trip flights

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6:00 am - 8:40 amORD-SEA

4h 40mnonstop

6:15 pm - 12:24 amSEA-ORD

4h 09mnonstop

$171Multiple Airlines

Find Deal

Fri, Oct 31 - Sat, Nov 8

8:00 am - 10:44 amORD-SEA

4h 44mnonstop

6:15 pm - 12:24 amSEA-ORD

4h 09mnonstop

$172Alaska Airlines

Find Deal

Sat, Nov 1 - Sat, Nov 8

10:43 pm - 6:32 pmORD-SEA

21h 49m1 stop

12:58 pm - 11:29 pmSEA-ORD

8h 31m1 stop

$173Frontier

Find Deal

Fri, Oct 31 - Sat, Nov 8

12:30 pm - 12:13 pmMDW-SEA

25h 43m1 stop

12:58 pm - 11:30 amSEA-MDW

20h 32m1 stop

$174Frontier

Find Deal

Fri, Oct 31 - Sat, Nov 8

9:05 am - 11:40 amMDW-SEA

4h 35mnonstop

5:45 am - 11:40 amSEA-MDW

3h 55mnonstop

$177Southwest

Find Deal

Fri, Oct 31 - Sat, Nov 8

7:37 am - 10:15 amORD-SEA

4h 38mnonstop

5:55 pm - 11:50 pmSEA-ORD

3h 55mnonstop

$178Delta

Find Deal

Sat, Nov 1 - Sat, Nov 8

2:30 pm - 9:30 pmMDW-SEA

9h 00m1 stop

5:45 am - 11:40 amSEA-MDW

3h 55mnonstop

$187Southwest

Find Deal

Fri, Oct 31 - Sat, Nov 8

3:52 pm - 8:36 pmORD-SEA

6h 44m1 stop

5:55 pm - 11:59 pmSEA-ORD

4h 04mnonstop

$187Delta

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Mon, Nov 17 - Mon, Nov 24

7:35 am - 10:25 amORD-SEA

4h 50mnonstop

1:35 pm - 7:50 pmSEA-ORD

4h 15mnonstop

$206American Airlines

Find Deal

Mon, Nov 10 - Wed, Nov 12

8:30 pm - 11:18 pmORD-SEA

4h 48mnonstop

12:59 am - 6:59 amSEA-ORD

4h 00mnonstop

$208American Airlines

Find Deal

Sat, Nov 15 - Fri, Nov 21

American Airlines flights from Illinois to Seattle

Our best American Airlines deals on Illinois to Seattle flight tickets

American Airlines

Nov 10

ORD7:35 amChicago O'Hare Intl

4h 50m

SEA10:25 amSeattle/Tacoma Intl

Nov 12

SEA1:35 pmSeattle/Tacoma Intl

4h 15m

ORD7:50 pmChicago O'Hare Intl

$206

Find similar

American Airlines

Nov 15

ORD8:30 pmChicago O'Hare Intl

4h 48m

SEA11:18 pmSeattle/Tacoma Intl

Nov 21

SEA12:59 amSeattle/Tacoma Intl

4h 00m

ORD6:59 amChicago O'Hare Intl

$208

Find similar

American Airlines

Oct 29

STL12:51 pmLambert-St Louis

9h 19m

1 stop

SEA8:10 pmSeattle/Tacoma Intl

Nov 2

SEA12:59 amSeattle/Tacoma Intl

10h 41m

1 stop

STL1:40 pmLambert-St Louis

$217

Find similar

United Airlines flights from Illinois to Seattle

Our best United Airlines deals on Illinois to Seattle flight tickets

United Airlines

Jan 16

STL2:45 pmLambert-St Louis

8h 30m

1 stop

SEA9:15 pmSeattle/Tacoma Intl

Jan 18

SEA7:30 pmSeattle/Tacoma Intl

7h 41m

1 stop

STL5:11 amLambert-St Louis

$250

Find similar

United Airlines

Dec 4

STL1:35 pmLambert-St Louis

11h 40m

2 stops

SEA11:15 pmSeattle/Tacoma Intl

Dec 6

SEA5:05 amSeattle/Tacoma Intl

5h 34m

1 stop

STL12:39 pmLambert-St Louis

$255

Find similar

United Airlines

Oct 29

STL1:35 pmLambert-St Louis

11h 40m

2 stops

SEA11:15 pmSeattle/Tacoma Intl

Nov 3

SEA7:00 amSeattle/Tacoma Intl

7h 27m

1 stop

STL4:27 pmLambert-St Louis

$258

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Fly from

Fly to

Route

Depart

Return

Price

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 10/31

6:00 am-8:40 am

Nonstop4h 40m

Seattle/Tacoma Intl

Sat 11/8

6:15 pm-12:24 am

Nonstop4h 09m

$171

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 11/1

8:00 am-10:44 am

Nonstop4h 44m

Seattle/Tacoma Intl

Sat 11/8

6:15 pm-12:24 am

Nonstop4h 09m

$172

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 10/31

10:43 pm-6:32 pm

1 stop21h 49m

Seattle/Tacoma Intl

Sat 11/8

12:58 pm-11:29 pm

1 stop8h 31m

$173

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Fri 10/31

12:30 pm-12:13 pm

1 stop25h 43m

Seattle/Tacoma Intl

Sat 11/8

12:58 pm-11:30 am

1 stop20h 32m

$174

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Fri 10/31

9:05 am-11:40 am

Nonstop4h 35m

Seattle/Tacoma Intl

Sat 11/8

5:45 am-11:40 am

Nonstop3h 55m

$177

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 11/1

7:37 am-10:15 am

Nonstop4h 38m

Seattle/Tacoma Intl

Sat 11/8

5:55 pm-11:50 pm

Nonstop3h 55m

$178

ChicagoSeattle

MDW - SEA

MDWSEA

Chicago Midway

Fri 10/31

2:30 pm-9:30 pm

1 stop9h 00m

Seattle/Tacoma Intl

Sat 11/8

5:45 am-11:40 am

Nonstop3h 55m

$187

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 11/17

3:52 pm-8:36 pm

1 stop6h 44m

Seattle/Tacoma Intl

Mon 11/24

5:55 pm-11:59 pm

Nonstop4h 04m

$187

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 11/10

7:35 am-10:25 am

Nonstop4h 50m

Seattle/Tacoma Intl

Wed 11/12

1:35 pm-7:50 pm

Nonstop4h 15m

$206

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 11/15

8:30 pm-11:18 pm

Nonstop4h 48m

Seattle/Tacoma Intl

Fri 11/21

12:59 am-6:59 am

Nonstop4h 00m

$208

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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 $218. 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 $229.

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 $339. 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 $448.

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 $326 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $375. Departure times at noon 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 Midway 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 $284 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 $249 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?

No. A direct flight is the cheapest option for a flight between Illinois 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	$149
Fastest flight time	4h 26m
Direct flights	Every day
Airports in Seattle	1 airport

The best one-way flight to Seattle from Illinois in the past 72 hours is $149. The best round-trip flight deal from Illinois to Seattle found on momondo in the last 72 hours is $189.

The fastest flight from Illinois to Seattle takes 4h 26m

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 October 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 737-900 Passenger/BBJ3 (winglets), representing 19.18% of all bookings. The subsequent popular models are Boeing 737-800 at 15.26%, Boeing 737 MAX 9 at 13.18%, and Airbus A321neo at 10.95%.

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 2,764 reviews	Search Hawaiian Airlines flights
Spirit Airlines	PriceFrom $105	Free Cancellation	Rating 6.3 8,071 reviews	Search Spirit Airlines flights
Delta	PriceFrom $120	Free Cancellation	Rating 7.9 7,966 reviews	Search Delta flights
Frontier	PriceFrom $127	Free Cancellation	Rating 5.8 3,153 reviews	Search Frontier flights
Alaska Airlines	PriceFrom $169	Free Cancellation	Rating 8.0 10,000 reviews	Search Alaska Airlines flights
American Airlines	PriceFrom $170	Free Cancellation	Rating 7.2 10,000 reviews	Search American Airlines flights
United Airlines	PriceFrom $178	Free Cancellation	Rating 7.4 8,940 reviews	Search United Airlines flights
Southwest	PriceFrom $189	Free Cancellation	Rating 8.0 4,248 reviews	Search Southwest flights

Tacoma

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Puyallup

Marysville

Federal Way

Tukwila

Kirkland

Fife

Centralia

Shoreline

Lakewood

Cle Elum

Redmond

Westport

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.

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Cheap flights from Illinois to Seattle from $83

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 11/11. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Find the cheapest flights from Illinois to Seattle

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American Airlines flights from Illinois to Seattle

Our best American Airlines deals on Illinois to Seattle flight tickets

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Our best United Airlines deals on Illinois to Seattle flight tickets

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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 Midway 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?

No. A direct flight is the cheapest option for a flight between Illinois to Seattle.

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

Frontier, Southwest, and Delta 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?

36 flights are operational daily from Illinois to Seattle as of October 2025. The most popular departure time for this route is 5:00PM, with 47% of flights per day taking off in the afternoon.

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

As of October 2025, there are 256 flights per week flying from Illinois to Seattle. The most common day of the week flights depart is Sat, with 25% 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