Latest deals
Insights
When to book
FAQs
Reviews
Price Alerts

Cheap flights from Chicago O'Hare Intl Airport to Seattle from $149

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to Seattle departing on 8/20. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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
8:11 pm - 10:39 am
ORD
-
SEA
16h 28m
1 stop
Frontier Logo
8:48 pm - 6:37 pm
SEA
-
ORD
19h 49m
1 stop
$288Frontier
Fri, Aug 28 - Wed, Sep 2
Frontier Logo
9:20 pm - 5:51 pm
ORD
-
SEA
22h 31m
1 stop
Frontier Logo
10:34 am - 5:59 am
SEA
-
ORD
17h 25m
1 stop
$288Frontier
Sun, Aug 23 - Wed, Aug 26
Alaska Airlines Logo
4:08 pm - 6:47 pm
ORD
-
SEA
4h 39mnonstop
Alaska Airlines Logo
6:00 am - 12:07 pm
SEA
-
ORD
4h 07mnonstop
$288Alaska Airlines
Sat, Sep 12 - Sat, Sep 19
Multiple Airlines Logo
6:00 am - 8:30 am
ORD
-
SEA
4h 30mnonstop
Multiple Airlines Logo
7:45 pm - 5:38 am
SEA
-
ORD
7h 53m
1 stop
$288Multiple Airlines
Tue, Sep 29 - Mon, Oct 5
Multiple Airlines Logo
3:52 pm - 6:25 pm
ORD
-
SEA
4h 33mnonstop
Multiple Airlines Logo
7:45 pm - 5:38 am
SEA
-
ORD
7h 53m
1 stop
$288Multiple Airlines
Wed, Sep 23 - Mon, Sep 28
Alaska Airlines Logo
2:21 pm - 10:33 pm
ORD
-
SEA
10h 12m
1 stop
Alaska Airlines Logo
11:41 pm - 5:40 am
SEA
-
ORD
3h 59mnonstop
$291Alaska Airlines
Thu, Oct 22 - Thu, Oct 22
American Airlines Logo
6:01 pm - 8:52 pm
ORD
-
SEA
4h 51mnonstop
American Airlines Logo
11:56 pm - 6:05 am
SEA
-
ORD
4h 09mnonstop
$316American Airlines
Sat, Aug 29 - Sat, Sep 5
American Airlines Logo
6:01 pm - 8:52 pm
ORD
-
SEA
4h 51mnonstop
American Airlines Logo
11:56 pm - 6:05 am
SEA
-
ORD
4h 09mnonstop
$317American Airlines
Sat, Aug 29 - Tue, Sep 1
United Airlines Logo
9:25 am - 12:19 pm
ORD
-
SEA
4h 54mnonstop
United Airlines Logo
10:56 pm - 5:06 am
SEA
-
ORD
4h 10mnonstop
$317United Airlines
Sat, Oct 31 - Tue, Nov 3
United Airlines Logo
8:45 am - 11:27 am
ORD
-
SEA
4h 42mnonstop
United Airlines Logo
10:50 am - 5:00 pm
SEA
-
ORD
4h 10mnonstop
$317United Airlines
Tue, Oct 20 - Tue, Oct 27

Save money when you book flights with momondo

Big names and deals

Big names and deals

Search 100s of travel sites to compare prices.

Filter for what you want

Filter for what you want

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

Trusted and free

Trusted and free

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

Price Alerts

Price Alerts

Not ready to book? to track prices.
Search flight deals

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
Aug 7
ORD9:57 pmChicago O'Hare Intl
13h 07m
1 stop
SEA9:04 amSeattle/Tacoma Intl
Aug 12
SEA8:13 pmSeattle/Tacoma Intl
7h 24m
1 stop
ORD5:37 amChicago O'Hare Intl
$288
Frontier
Aug 16
ORD7:29 amChicago O'Hare Intl
29h 35m
1 stop
SEA11:04 amSeattle/Tacoma Intl
Aug 30
SEA9:29 pmSeattle/Tacoma Intl
19h 33m
1 stop
ORD7:02 pmChicago O'Hare Intl
$289
Frontier
Aug 27
ORD9:20 pmChicago O'Hare Intl
22h 31m
1 stop
SEA5:51 pmSeattle/Tacoma Intl
Aug 31
SEA7:06 pmSeattle/Tacoma Intl
16h 30m
1 stop
ORD1:36 pmChicago O'Hare Intl
$290

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

Our best Alaska Airlines deals on Chicago O'Hare Intl Airport to Seattle flight tickets
Alaska Airlines
Nov 2
ORD7:56 pmChicago O'Hare Intl
20h 51m
1 stop
SEA2:47 pmSeattle/Tacoma Intl
Nov 3
SEA5:46 pmSeattle/Tacoma Intl
4h 11m
ORD11:57 pmChicago O'Hare Intl
$297
Alaska Airlines
Sep 2
ORD9:00 amChicago O'Hare Intl
4h 39m
SEA11:39 amSeattle/Tacoma Intl
Sep 9
SEA8:41 amSeattle/Tacoma Intl
8h 40m
1 stop
ORD7:21 pmChicago O'Hare Intl
$327

momondo Fare Finder

 
Customize your flight search to find flights from Chicago O'Hare Intl Airport to Seattle that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated July 30, 2026.
Use the filters below to find and compare flights from Chicago O'Hare Intl Airport to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 8/28

8:11 pm-10:39 am

1 stop16h 28m

Seattle/Tacoma Intl

Wed 9/2

8:48 pm-6:37 pm

1 stop19h 49m

$288

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sun 8/23

9:20 pm-5:51 pm

1 stop22h 31m

Seattle/Tacoma Intl

Wed 8/26

10:34 am-5:59 am

1 stop17h 25m

$288
Quickest round-trip

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 9/12

4:08 pm-6:47 pm

Nonstop4h 39m

Seattle/Tacoma Intl

Sat 9/19

6:00 am-12:07 pm

Nonstop4h 07m

$288

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 9/29

6:00 am-8:30 am

Nonstop4h 30m

Seattle/Tacoma Intl

Mon 10/5

7:45 pm-5:38 am

1 stop7h 53m

$288

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Wed 9/23

3:52 pm-6:25 pm

Nonstop4h 33m

Seattle/Tacoma Intl

Mon 9/28

7:45 pm-5:38 am

1 stop7h 53m

$288

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 10/22

2:21 pm-10:33 pm

1 stop10h 12m

Seattle/Tacoma Intl

Thu 10/22

11:41 pm-5:40 am

Nonstop3h 59m

$291

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 8/29

6:01 pm-8:52 pm

Nonstop4h 51m

Seattle/Tacoma Intl

Sat 9/5

11:56 pm-6:05 am

Nonstop4h 09m

$316

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 8/29

6:01 pm-8:52 pm

Nonstop4h 51m

Seattle/Tacoma Intl

Tue 9/1

11:56 pm-6:05 am

Nonstop4h 09m

$317

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 10/31

9:25 am-12:19 pm

Nonstop4h 54m

Seattle/Tacoma Intl

Tue 11/3

10:56 pm-5:06 am

Nonstop4h 10m

$317

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 10/20

8:45 am-11:27 am

Nonstop4h 42m

Seattle/Tacoma Intl

Tue 10/27

10:50 am-5:00 pm

Nonstop4h 10m

$317

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
1
2

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 $295 to $437.
The lowest price recently found on this route was $288.

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 $218. 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 $238.

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 $375. 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 $456.

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 $372 when looking at flights departing in the evening. Flights to Seattle are more costly in the afternoon, with an average ticket price of $416. Departure times in the afternoon 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 $314 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 $291 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.

Can stopping save me money on Chicago O'Hare Intl Airport to Seattle flights?

You could potentially save up to 28% on your flight if you consider stops on a Chicago O'Hare Intl Airport to Seattle flight.

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

As of July 2026, prices for Chicago O'Hare Intl Airport to Seattle flights are approximately 8% 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

$206

Fastest flight time

4h 30m

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 $206. The best round-trip flight deal from Chicago O'Hare Intl Airport to Seattle found on momondo in the last 72 hours is $374.
The fastest flight from Chicago O'Hare Intl Airport to Seattle takes 4h 30m
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 30m.

  • 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
Hawaiian AirlinesPriceFrom $62Free CancellationRating
7.8
2,820 reviews
Search Hawaiian Airlines flights
FrontierPriceFrom $131Free CancellationRating
5.6
2,749 reviews
Search Frontier flights
DeltaPriceFrom $151Free CancellationRating
7.8
8,492 reviews
Search Delta flights
Alaska AirlinesPriceFrom $177Free CancellationRating
7.9
12,730 reviews
Search Alaska Airlines flights
American AirlinesPriceFrom $178Free CancellationRating
7.1
11,845 reviews
Search American Airlines flights
United AirlinesPriceFrom $180Free CancellationRating
7.4
10,053 reviews
Search United Airlines flights

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

    Alaska Airlines operates around 16 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 $355, 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 12,730 reviews.

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

    Across 8,492 Delta reviews on momondo, the average score is 7.8/10. Delta flies from Chicago O'Hare Intl Airport to Seattle about 9 times each week, with ticket deals ranging from $151 to $343. 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
Kent
Lynnwood
Redmond
Lakewood
Puyallup
Tukwila
Federal Way
Fife
Cle Elum
Marysville
Kirkland
Centralia
Shoreline
Lacey

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.

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
Sat 8/29
Sat 9/5
By creating a price alert you accept our terms of use and privacy policy.

Find better results for your trip to the United States