Find cheap flights from Illinois to Seattle/Tacoma Airport

SEA

Find cheap flights from Illinois to Seattle/Tacoma Airport

Round-trip
Economy
Washington (WAS)
Seattle/Tacoma Intl
Fri 7/10
Fri 7/17
Any month
Compare vs. KAYAK |
Search hundreds of travel sites at once for deals on flights to Seattle/Tacoma Airport

Good to know

Low season

February Best time to beat the crowds with an average 4% drop in price.

High season

March Most popular time to fly with an average 6% increase in price.

Average price of a round-trip

$371 (avg. price over the last 2 weeks)

Good deal for a round-trip

$163 or less

FAQs for booking Illinois to Seattle/Tacoma Airport flights

How does KAYAK’s flight Price Forecast tool help me choose the right time to buy?

Top 3 airlines serving Illinois to Seattle/Tacoma Intl

Scores according to KAYAK customer reviews

8.0
Delta
Overall score based on 28,441 reviews
8.2
Boarding
7.8
Comfort
8.5
Crew
7.8
Entertainment
7.5
Food
Airline reviews
Read more about Delta

Book cheap flights from Illinois to Seattle/Tacoma Airport (round-trip)

Airports
Origin
Chicago
$74
only
$74
$128
only
$128
Destination
Seattle
$74
only
$74
Thu, Aug 6
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Mon, Aug 10
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 5 days
Based on null reviews
Wed, Sep 2
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Sat, Sep 12
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 43m
Trip: 11 days
Based on null reviews
Sat, Aug 8
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 37m
Sat, Aug 15
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 55m
Trip: 8 days
Based on null reviews
Thu, Aug 6
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Fri, Aug 14
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 9 days
Based on null reviews
Sat, Aug 15
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Fri, Aug 21
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 7 days
Based on null reviews
Fri, Aug 7
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Mon, Aug 10
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 4 days
Based on null reviews
Wed, Aug 5
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Thu, Aug 13
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 52m
Trip: 9 days
Based on null reviews
Tue, Sep 1
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Mon, Sep 7
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 7 days
Based on null reviews
Sat, Aug 8
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
8h 55m
Sat, Aug 15
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 55m
Trip: 8 days
Based on null reviews
Sat, Aug 8
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
8h 00m
Mon, Aug 10
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 3 days
Based on null reviews
Tue, Aug 4
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
10h 24m
Mon, Aug 10
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 7 days
Based on null reviews
Thu, Sep 3
MDW
Chicago Midway Airport
SEA
Seattle/Tacoma Airport
8h 11m
Mon, Sep 14
SEA
Seattle/Tacoma Airport
MDW
Chicago Midway Airport
7h 22m
Trip: 12 days
Based on null reviews
Wed, Jul 29
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 40m
Tue, Aug 4
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 7 days
Based on null reviews
Thu, Aug 6
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Tue, Aug 11
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
15h 19m
Trip: 6 days
Based on null reviews
Fri, Aug 7
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Mon, Aug 17
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
4h 03m
Trip: 11 days
Based on null reviews
Mon, Aug 3
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
10h 24m
Fri, Aug 7
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
3h 57m
Trip: 5 days
Based on null reviews
Fri, Aug 14
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Mon, Aug 17
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
4h 03m
Trip: 4 days
Based on null reviews
Fri, Sep 4
MDW
Chicago Midway Airport
SEA
Seattle/Tacoma Airport
6h 49m
Mon, Sep 7
SEA
Seattle/Tacoma Airport
MDW
Chicago Midway Airport
6h 36m
Trip: 4 days
Based on null reviews
Thu, Aug 13
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Tue, Aug 18
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
15h 19m
Trip: 6 days
Based on null reviews
Thu, Aug 6
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Thu, Aug 13
SEA
Seattle/Tacoma Airport
ORD
Chicago O'Hare Airport
9h 49m
Trip: 8 days
Based on null reviews

Book cheap flights from Illinois to Seattle/Tacoma Airport (one-way)

Airports
Origin
Chicago
$36
only
$36
$85
only
$85
Destination
Seattle
$36
only
$36
Wed, Aug 19
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Based on null reviews
Sat, Aug 1
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 37m
Based on null reviews
Sat, Aug 15
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Based on null reviews
Wed, Aug 12
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Based on null reviews
Tue, Jul 14
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
27h 30m
Based on null reviews
Wed, Jul 15
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
19h 11m
Based on null reviews
Sat, Aug 1
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
8h 00m
Based on null reviews
Thu, Aug 6
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
16h 11m
Based on null reviews
Sun, Aug 9
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
12h 09m
Based on null reviews
Sat, Jul 4
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 24m
Based on null reviews
Thu, Aug 20
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
16h 11m
Based on null reviews
Tue, Aug 18
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
12h 43m
Based on null reviews
Tue, Aug 18
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
16h 11m
Based on null reviews
Tue, Jul 14
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
5h 40m
Based on null reviews
Mon, Sep 7
MDW
Chicago Midway Airport
SEA
Seattle/Tacoma Airport
6h 30m
Based on null reviews
Thu, Aug 20
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Based on null reviews
Sat, Jul 25
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
22h 41m
Based on null reviews
Tue, Aug 18
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
4h 28m
Based on null reviews
Mon, Jul 13
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
27h 30m
Based on null reviews
Wed, Jul 29
ORD
Chicago O'Hare Airport
SEA
Seattle/Tacoma Airport
6h 14m
Based on null reviews
*
Prices are per person and are for e–tickets and include all taxes & fees in USD.

We attempt to get accurate prices, however, prices are not guaranteed.

Here's why:

We’re not the seller.
At KAYAK we don’t set the prices, so it’s not possible for us to guarantee what other companies are selling.

We compile tonnes of data for you
Our service lets you quickly and easily compare results from hundreds of travel sites at once. In this sense, KAYAK is a search engine and we can't guarantee prices we find.

Why aren’t prices accurate 100% of the time?
Prices on airline seats, hotel rooms and car rentals can change frequently. Several people may also be trying to buy the same travel option simultaneously. As a result, you may find, on occasion, that certain prices are no longer available.

If you have more questions or if you have a bad price to report to us,
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