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Cheap flights from Chicago to Seattle from £77

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 to Seattle departing on 15/10. 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
0 bags
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Cheap return flights

Alaska Airlines Logo
06:00 - 08:41ORD-SEA
4h 41mdirect
Alaska Airlines Logo
12:08 - 14:09SEA-ORD
24h 01m1 stop
£136Alaska Airlines
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Mon, 15 Dec - Mon, 15 Dec
Alaska Airlines Logo
08:00 - 10:40ORD-SEA
4h 40mdirect
Alaska Airlines Logo
15:31 - 21:40SEA-ORD
4h 09mdirect
£143Alaska Airlines
Find Deal
Sat, 25 Oct - Fri, 31 Oct
Frontier Logo
07:05 - 12:07ORD-SEA
7h 02m1 stop
Frontier Logo
20:43 - 09:36SEA-ORD
10h 53m1 stop
£148Frontier
Find Deal
Sat, 18 Oct - Sat, 25 Oct
Alaska Airlines Logo
06:00 - 08:27ORD-SEA
4h 27mdirect
Alaska Airlines Logo
10:55 - 17:03SEA-ORD
4h 08mdirect
£149Alaska Airlines
Find Deal
Sat, 25 Oct - Sat, 25 Oct
Hawaiian Airlines Logo
17:59 - 20:35ORD-SEA
4h 36mdirect
Hawaiian Airlines Logo
10:55 - 17:03SEA-ORD
4h 08mdirect
£152Hawaiian Airlines
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Sat, 18 Oct - Sat, 25 Oct
Delta Logo
18:05 - 20:45ORD-SEA
4h 40mdirect
Delta Logo
17:55 - 23:50SEA-ORD
3h 55mdirect
£154Delta
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Tue, 21 Oct - Wed, 29 Oct
American Airlines Logo
07:15 - 09:49ORD-SEA
4h 34mdirect
American Airlines Logo
00:34 - 06:42SEA-ORD
4h 08mdirect
£155American Airlines
Find Deal
Sat, 11 Oct - Fri, 17 Oct
Delta Logo
18:05 - 20:45ORD-SEA
4h 40mdirect
Delta Logo
17:55 - 23:54SEA-ORD
3h 59mdirect
£171Delta
Find Deal
Fri, 24 Oct - Sat, 25 Oct
American Airlines Logo
21:50 - 00:27ORD-SEA
4h 37mdirect
American Airlines Logo
06:10 - 12:22SEA-ORD
4h 12mdirect
£174American Airlines
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Mon, 13 Oct - Mon, 20 Oct
Hawaiian Airlines Logo
07:00 - 14:35ORD-SEA
9h 35m1 stop
Hawaiian Airlines Logo
00:17 - 06:24SEA-ORD
4h 07mdirect
£196Hawaiian Airlines
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Thu, 16 Oct - Sat, 18 Oct

Alaska Airlines flights from Chicago to Seattle

Our best Alaska Airlines deals on Chicago to Seattle flight tickets
Alaska Airlines
15 Dec
ORD06:00Chicago O'Hare Intl
4h 41m
SEA08:41Seattle/Tacoma Intl
15 Dec
SEA12:08Seattle/Tacoma Intl
24h 01m
1 stop
ORD14:09Chicago O'Hare Intl
£136
Find similar
Alaska Airlines
25 Oct
ORD08:00Chicago O'Hare Intl
4h 40m
SEA10:40Seattle/Tacoma Intl
31 Oct
SEA15:31Seattle/Tacoma Intl
4h 09m
ORD21:40Chicago O'Hare Intl
£143
Find similar
Alaska Airlines
25 Oct
ORD06:00Chicago O'Hare Intl
4h 27m
SEA08:27Seattle/Tacoma Intl
25 Oct
SEA10:55Seattle/Tacoma Intl
4h 08m
ORD17:03Chicago O'Hare Intl
£149
Find similar

Delta flights from Chicago to Seattle

Our best Delta deals on Chicago to Seattle flight tickets
Delta
21 Oct
ORD18:05Chicago O'Hare Intl
4h 40m
SEA20:45Seattle/Tacoma Intl
29 Oct
SEA17:55Seattle/Tacoma Intl
3h 55m
ORD23:50Chicago O'Hare Intl
£154
Find similar
Delta
24 Oct
ORD18:05Chicago O'Hare Intl
4h 40m
SEA20:45Seattle/Tacoma Intl
25 Oct
SEA17:55Seattle/Tacoma Intl
3h 59m
ORD23:54Chicago O'Hare Intl
£171
Find similar
Delta
1 Oct
ORD17:30Chicago O'Hare Intl
4h 38m
SEA20:08Seattle/Tacoma Intl
7 Oct
SEA07:25Seattle/Tacoma Intl
4h 05m
ORD13:30Chicago O'Hare Intl
£176
Find similar

momondo Fare Finder

 
Customise your flight search to find flights from Chicago 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 279,928 searches. Data last updated 16 September 2025.
Use the filters below to find and compare flights from Chicago to Seattle that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 15/12

06:00-08:41

Nonstop4h 41m

Seattle/Tacoma Intl

Mon 15/12

12:08-14:09

1 stop24h 01m

£136

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 25/10

08:00-10:40

Nonstop4h 40m

Seattle/Tacoma Intl

Fri 31/10

15:31-21:40

Nonstop4h 09m

£143

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 18/10

07:05-12:07

1 stop7h 02m

Seattle/Tacoma Intl

Sat 25/10

20:43-09:36

1 stop10h 53m

£148

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 25/10

06:00-08:27

Nonstop4h 27m

Seattle/Tacoma Intl

Sat 25/10

10:55-17:03

Nonstop4h 08m

£149

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 18/10

17:59-20:35

Nonstop4h 36m

Seattle/Tacoma Intl

Sat 25/10

10:55-17:03

Nonstop4h 08m

£152

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Tue 21/10

18:05-20:45

Nonstop4h 40m

Seattle/Tacoma Intl

Wed 29/10

17:55-23:50

Nonstop3h 55m

£154

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Sat 11/10

07:15-09:49

Nonstop4h 34m

Seattle/Tacoma Intl

Fri 17/10

00:34-06:42

Nonstop4h 08m

£155

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Fri 24/10

18:05-20:45

Nonstop4h 40m

Seattle/Tacoma Intl

Sat 25/10

17:55-23:54

Nonstop3h 59m

£171

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Mon 13/10

21:50-00:27

Nonstop4h 37m

Seattle/Tacoma Intl

Mon 20/10

06:10-12:22

Nonstop4h 12m

£174

ChicagoSeattle

ORD - SEA

ORDSEA

Chicago O'Hare Intl

Thu 16/10

07:00-14:35

1 stop9h 35m

Seattle/Tacoma Intl

Sat 18/10

00:17-06:24

Nonstop4h 07m

£196

Flights are sorted by cheapest return 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 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 and Seattle?

What is the cheapest month to fly to Seattle?

The cheapest month to fly to Seattle from Chicago is in February. Flight prices, which tend to average around £160, are often lower during this time because this is during the off-season. The month of April is another great option to travel to Seattle, with average flight prices from Chicago averaging around £169.

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

According to our data, Thursday is the cheapest day to fly to Seattle from Chicago. The lowest ticket price found for a Thursday departure recently was £183. Keep in mind that prices can always vary depending on your route and whether or not you are flying domestic or international. Be sure to avoid booking your departure on a Saturday as prices are generally higher than usual. According to our data, the average ticket price to Seattle on Saturday is £476.

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

According to our data, the cheapest time of day to fly to Seattle is in the evening. momondo users have found flights departing from Chicago to Seattle in the evening for as low as £215. Keep in mind that these prices may fluctuate based on what airline you choose and the time of year you plan to travel. Flights in the morning are often more expensive, with an average ticket price of £344.

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

Fly from Chicago O'Hare Intl to Seattle/Tacoma Intl for the best Chicago - 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 Chicago when booking weeks ahead of your departure date. In general, you can expect to find flights to Seattle for around £210 when searching weeks before you fly. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Seattle from Chicago for as low as £182 on momondo.

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

There are 3 cabin classes available to choose from on Chicago 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.

How have Chicago to Seattle flight prices changed over time?

As of September 2025, prices for Chicago to Seattle flights are approximately 3% more expensive when compared to flights at the same time last year.

When to book flights from Chicago to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Chicago to Seattle according to our flight data. Find out which month and days have the cheapest flights.
Estimated return price

Cheap Chicago to Seattle (CHI to SEA) flight deals and tips

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

Fastest flight time

4h 27m

Direct flights

Every day

Airports in Seattle

1 airport
The fastest flight from Chicago to Seattle takes 4h 27m
Direct flights go from Chicago to Seattle every day.
There is 1 airport near Seattle: Seattle/Tacoma Intl (SEA)
Search flight deals

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

    The straight-line distance from Chicago to Seattle/Tacoma Intl is 1732.3 mi. By plane, this route typically takes 4h 27m.

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

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

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

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

    The travel and health documents required for your trip to Seattle/Tacoma Intl Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Seattle/Tacoma Intl Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular plane model from Chicago to Seattle?

Travelling to a place near Seattle?

Book flights to Seattle if you plan to visit one of these locations
Fife
Tukwila
Renton
SeaTac

Why use momondo?

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

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Chicago to Seattle for you.

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

Yes. All flights to Seattle from Chicago on momondo can be compared and filtered by various policies on offer, including flexible booking.

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

Once you have performed a search for Chicago 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 Chicago to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Chicago to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.

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