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Cheap flights from Chicago O'Hare Intl Airport to Seattle from $143

1 adult
1 adult, Economy, 0 bags

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Chicago O'Hare Intl Airport to Seattle

Cheap round-trip flights

Enter your travel dates to find the best prices.
Frontier Logo
6:30 am - 3:12 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
10h 42m1 stop Denver Intl
Frontier Logo
4:37 pm - 12:53 amSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
6h 16m1 stop Denver Intl
$275Frontier
Sat, Nov 14 - Sat, Nov 21
United Airlines Logo
1:30 pm - 8:56 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
9h 26m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
2:05 pm - 8:15 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 10mnonstop
$275United Airlines
Wed, Nov 25 - Wed, Dec 2
Multiple Airlines Logo
6:00 am - 8:57 amORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
4h 57mnonstop
Multiple Airlines Logo
9:09 pm - 5:01 amSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
29h 52m1 stop Las Vegas Harry Reid Intl
$275Multiple Airlines
Tue, Dec 8 - Fri, Dec 11
United Airlines Logo
1:30 pm - 8:56 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
9h 26m1 stop Washington, D.C. Dulles Intl
United Airlines Logo
7:00 am - 1:10 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 10mnonstop
$275United Airlines
Wed, Nov 18 - Wed, Dec 2
Multiple Airlines Logo
2:17 pm - 9:44 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
9h 27m1 stop San Diego
Multiple Airlines Logo
4:29 pm - 12:26 amSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
5h 57m1 stop Denver Intl
$276Multiple Airlines
Fri, Dec 25 - Wed, Jan 13
Frontier Logo
6:40 am - 3:22 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
10h 42m1 stop Denver Intl
Frontier Logo
9:53 pm - 4:59 amSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
29h 06m1 stop Las Vegas Harry Reid Intl
$276Frontier
Fri, Nov 20 - Mon, Nov 30
Alaska Airlines Logo
2:13 pm - 9:26 amORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
21h 13m1 stop San Diego
Alaska Airlines Logo
11:45 am - 5:59 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 14mnonstop
$277Alaska Airlines
Wed, Jan 27 - Thu, Jan 28
Alaska Airlines Logo
2:13 pm - 9:26 amORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
21h 13m1 stop San Diego
Alaska Airlines Logo
11:45 am - 5:59 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 14mnonstop
$277Alaska Airlines
Tue, Jan 26 - Wed, Jan 27
Delta Logo
5:55 pm - 8:38 pmORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
4h 43mnonstop
Delta Logo
7:20 am - 1:30 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 10mnonstop
$281Delta
Wed, Nov 25 - Tue, Dec 1
Delta Logo
6:40 am - 9:37 amORD  Chicago O'Hare Intl-SEA Seattle/Tacoma Intl
4h 57mnonstop
Delta Logo
7:20 am - 1:30 pmSEA  Seattle/Tacoma Intl-ORD Chicago O'Hare Intl
4h 10mnonstop
$281Delta
Thu, Dec 3 - Thu, Dec 10

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United Airlines flights from Chicago O'Hare Intl Airport to Seattle

Our best United Airlines deals on Chicago O'Hare Intl Airport to Seattle flight tickets
United Airlines
Nov 18
ORD1:30 pmChicago O'Hare Intl
9h 26m
1 stop
SEA8:56 pmSeattle/Tacoma Intl
Dec 2
SEA7:00 amSeattle/Tacoma Intl
4h 10m
ORD1:10 pmChicago O'Hare Intl
$275
United Airlines
Nov 13
ORD9:25 amChicago O'Hare Intl
4h 54m
SEA12:19 pmSeattle/Tacoma Intl
Nov 17
SEA10:56 pmSeattle/Tacoma Intl
4h 10m
ORD5:06 amChicago O'Hare Intl
$291

Frontier flights from Chicago O'Hare Intl Airport to Seattle

Our best Frontier deals on Chicago O'Hare Intl Airport to Seattle flight tickets
Frontier
Feb 5
ORD6:21 amChicago O'Hare Intl
10h 53m
1 stop
SEA3:14 pmSeattle/Tacoma Intl
Feb 7
SEA6:33 pmSeattle/Tacoma Intl
9h 37m
1 stop
ORD6:10 amChicago O'Hare Intl
$276
Frontier
Nov 23
ORD6:40 amChicago O'Hare Intl
10h 42m
1 stop
SEA3:22 pmSeattle/Tacoma Intl
Nov 30
SEA9:53 pmSeattle/Tacoma Intl
29h 06m
1 stop
ORD4:59 amChicago O'Hare Intl
$278
Frontier
Nov 9
ORD6:30 amChicago O'Hare Intl
10h 42m
1 stop
SEA3:12 pmSeattle/Tacoma Intl
Nov 11
SEA4:27 pmSeattle/Tacoma Intl
14h 57m
2 stops
ORD9:24 amChicago O'Hare Intl
$279

momondo Fare Finder

 
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Seattle that are best for you.

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Route

Depart

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Price

Cheapest round-trip

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Sat 11/14

6:30 am-3:12 pm

1 stop10h 42m

Seattle/Tacoma Intl

Sat 11/21

4:37 pm-12:53 am

1 stop6h 16m

$275

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 11/25

1:30 pm-8:56 pm

1 stop9h 26m

Seattle/Tacoma Intl

Wed 12/2

2:05 pm-8:15 pm

Nonstop4h 10m

$275

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Tue 12/8

6:00 am-8:57 am

Nonstop4h 57m

Seattle/Tacoma Intl

Fri 12/11

9:09 pm-5:01 am

1 stop29h 52m

$275

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 11/18

1:30 pm-8:56 pm

1 stop9h 26m

Seattle/Tacoma Intl

Wed 12/2

7:00 am-1:10 pm

Nonstop4h 10m

$275

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Fri 12/25

2:17 pm-9:44 pm

1 stop9h 27m

Seattle/Tacoma Intl

Wed 1/13

4:29 pm-12:26 am

1 stop5h 57m

$276

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Fri 11/20

6:40 am-3:22 pm

1 stop10h 42m

Seattle/Tacoma Intl

Mon 11/30

9:53 pm-4:59 am

1 stop29h 06m

$276

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 1/27

2:13 pm-9:26 am

1 stop21h 13m

Seattle/Tacoma Intl

Thu 1/28

11:45 am-5:59 pm

Nonstop4h 14m

$277

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Tue 1/26

2:13 pm-9:26 am

1 stop21h 13m

Seattle/Tacoma Intl

Wed 1/27

11:45 am-5:59 pm

Nonstop4h 14m

$277
Quickest round-trip

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Wed 11/25

5:55 pm-8:38 pm

Nonstop4h 43m

Seattle/Tacoma Intl

Tue 12/1

7:20 am-1:30 pm

Nonstop4h 10m

$281

ChicagoSeattle

ORD Chicago O'Hare Intl - SEA Seattle/Tacoma Intl

ORDSEA

Chicago O'Hare Intl

Thu 12/3

6:40 am-9:37 am

Nonstop4h 57m

Seattle/Tacoma Intl

Thu 12/10

7:20 am-1:30 pm

Nonstop4h 10m

$281

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Seattle from

How to get the cheapest flight ticket from Chicago O'Hare Intl Airport 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 typical price of a round-trip flight between Chicago O'Hare Intl Airport and Seattle?

Prices are currently low for flights on this route.

Typical prices usually range from $311 to $486.
The lowest price recently found on this route was $272.

What is the cheapest month to fly to Seattle?

In general, January is the cheapest month to fly from Chicago O'Hare Intl Airport to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $213. If you don’t want to visit Seattle in January, then you should wait until February to fly from Chicago O'Hare Intl Airport, when ticket prices are also cheap, with an average price of $242.

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

On average, the least expensive day to fly to Seattle from Chicago O'Hare Intl Airport is on a Friday. momondo users have found tickets for Friday departures for as low as $394. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Monday is the most expensive day to depart from Chicago O'Hare Intl Airport because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $465.

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

Flying to Seattle from Chicago O'Hare Intl Airport in the evening is the least expensive time of day to depart. momondo users have found prices as low as $382 when looking at flights departing in the evening. Flights to Seattle are more costly at noon, with an average ticket price of $440. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

What is the cheapest Chicago O'Hare Intl to Seattle/Tacoma Intl flight route?

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

How far in advance should I book a flight from Chicago O'Hare Intl Airport to Seattle?

You are more likely to see cheaper flights to Seattle from Chicago O'Hare Intl Airport when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around $337 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Chicago O'Hare Intl Airport for as low as $337 on momondo.

What cabin class options are available on Chicago O'Hare Intl Airport to Seattle flights?

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

How have Chicago O'Hare Intl Airport to Seattle flight prices changed over time?

As of October 2026, prices for Chicago O'Hare Intl Airport to Seattle flights are approximately 9% more expensive when compared to flights at the same time last year.

When to book flights from Chicago O'Hare Intl Airport to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago O'Hare Intl Airport to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Chicago O'Hare Intl Airport to Seattle (ORD to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Seattle

Best Price Found

$143

Fastest flight time

4h 38m

Direct flights

Every day

Airports in Seattle

1 airport
The best one-way flight to Seattle from Chicago O'Hare Intl Airport in the past 72 hours is $143. The best round-trip flight deal from Chicago O'Hare Intl Airport to Seattle found on momondo in the last 72 hours is $275.
The fastest flight from Chicago O'Hare Intl Airport to Seattle takes 4h 38m
Direct flights go from Chicago O'Hare Intl Airport to Seattle every day.
There is 1 airport in Seattle. From Chicago O'Hare Intl Airport there are direct flights to Seattle/Tacoma Intl (SEA).
Search flight deals

Frequently asked questions about flying from Chicago O'Hare Intl Airport to Seattle

  • How far is Chicago O'Hare Intl to Seattle/Tacoma Intl by plane?

    Seattle/Tacoma Intl is 1716.3 mi away from Chicago O'Hare Intl. A reasonable flight in good conditions will take 4h 38m.

  • When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Seattle/Tacoma Intl Airport?

    Prices for flights from Chicago O'Hare Intl Airport to Seattle/Tacoma Intl Airport refresh daily.

  • How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Seattle/Tacoma Intl Airport?

  • How old do you have to be to fly from Chicago O'Hare Intl Airport to Seattle/Tacoma Intl Airport?

    The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Chicago O'Hare Intl Airport to Seattle/Tacoma Intl Airport.

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

    The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

  • What is the most popular plane model from Chicago O'Hare Intl Airport to Seattle?

  • What is the most popular airline from Chicago O'Hare Intl Airport to Seattle?

Best airlines flying from Chicago O'Hare Intl Airport to Seattle

Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Seattle with momondo
Airline
Rating
Free Cancellation
Price
FrontierPriceFrom $131Free CancellationRating
5.5
2,516 reviews
Search Frontier flights
Alaska AirlinesPriceFrom $177Free CancellationRating
7.9
13,121 reviews
Search Alaska Airlines flights
DeltaPriceFrom $177Free CancellationRating
7.8
8,680 reviews
Search Delta flights
American AirlinesPriceFrom $187Free CancellationRating
7.0
12,189 reviews
Search American Airlines flights
United AirlinesPriceFrom $196Free CancellationRating
7.3
10,442 reviews
Search United Airlines flights

  • Alaska Airlines Flights From Chicago O'Hare Intl Airport to Seattle

    Alaska Airlines operates around 9 flights from Chicago O'Hare Intl Airport to Seattle every week. The average price of these flights found in the last 72 hours has been $366, but momondo users have found Alaska Airlines deals from Chicago O'Hare Intl Airport to Seattle from as low as $177 round-trip. Alaska Airlines has been scored 7.9/10 in 13,121 reviews.

  • Delta Flights From Chicago O'Hare Intl Airport to Seattle

    Across 8,680 Delta reviews on momondo, the average score is 7.8/10. Delta flies from Chicago O'Hare Intl Airport to Seattle about 13 times each week, with ticket deals ranging from $177 to $357. Price data is based on momondo searches in the last 72 hours.

Traveling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
Leavenworth
SeaTac
Ocean Shores
Renton
Olympia
Redmond
Kent
Federal Way
Lakewood
Fife
Lynnwood
Puyallup
Tukwila
Cle Elum
Marysville
Lacey
Kirkland
Centralia
Shoreline

Why use momondo?

Why should I use momondo to find a flight deal from Chicago 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 Chicago.

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

momondo does allow users to show only those flights to Seattle from Chicago which offer a flexible booking policy as well as other useful filters and features.

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

momondo provides multiple filters to help you find the best flight to Seattle from Chicago. Filter by price, airline, airports, cabin, aircraft, payment method, number of stops and more.

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

Price alerts on flights to Seattle from Chicago are quick and easy to set up on momondo. Simply perform a search and select the price alert feature. It is as simple as that.

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