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$46 Find Cheap Flights from Seattle to Illinois

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Illinois departing on 12/4. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
0 bags

Search hundreds of travel sites at once for deals on flights to Illinois

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Illinois.
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Seattle to Illinois.

Best Illinois Flight Deals

Cheapest round-trip prices found by our users on KAYAK in the last 72 hours

Chicago
Chicago1 stop$104
Moline
Moline1 stop$402
Peoria
Peoria1 stop$338
Bloomington
Bloomington1 stop$468
Champaign
Champaign1 stop$836
Springfield
Springfield1 stop$673
Decatur
Decatur1 stop$358
St. Louis
St. Louis1 stop$118

Good to know

Low season

January

High season

July

Cheapest flight

$46
Best time to beat the crowds with an average 30% drop in price.
Most popular time to fly and prices are also 2% lower on average.
Flight from Seattle to Chicago O'Hare Airport

FAQs - booking Illinois flights

  • How does KAYAK find such low prices on flights from Seattle to Illinois?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Illinois.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Illinois?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Illinois from Seattle is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Illinois?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Illinois with an airline and back to Seattle with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Illinois?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Illinois from Seattle up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

See more FAQs

Top tips for finding cheap flights to Illinois

  • Looking for a cheap flight? 25% of our users found tickets from Seattle to the following destinations at these prices or less: Chicago $163 one-way - $285 round-trip
  • Morning departure is around 22% cheaper than an evening flight, on average*.
*Average of the lowest prices shown in KAYAK’s search results for departures within the next 30 days

Flights from Seattle to Illinois: the best tips from KAYAK users

Insights shared by verified travelers who flew the route from Seattle to Illinois 
Verified travelerFlew with Alaska AirlinesSEA-ORDOct 2024
Alaska airline has best boarding and baggage policy.
ShirleyFlew with Alaska AirlinesSEA-ORDJun 2024
I generally fly United or Delta out of South Bend, IN into Seattle or wherever I'm going. I have no issues with Alaska. I only use Alaska when flying with my family from the Seattle area back to Chicago O'Hare and then we drive to SW Michigan where I live. Alaska Airlines has a beautiful new terminal at SeaTac as well. A good airline. I do like planes that have screens on the back of the seats.
Verified travelerFlew with United AirlinesSEA-ORDJul 2024
Budget if you’re planning on shopping for meals or souvenirs at Sea-Tac, it’s not cheap.
Verified travelerFlew with Alaska AirlinesSEA-ORDJun 2024
Bring books and earplugs for the four hour flight and enjoy Chicago!

Top 5 airlines serving from Seattle to Illinois

 
See real verified KAYAK customer reviews for airlines flying from Seattle to Illinois. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Seattle to Illinois? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
8.4
EVA AirOverall score based on 1329 reviews
8.2Comfort
8.6Crew
8.0Entertainment
8.4Boarding
8.0Food
Airline reviews

It was a good flight. I would highly recommend it to family and friends.

8.0 ExcellentAnonymous, Oct 2024LAX - TPE
Read more EVA Air reviews

It was a good flight. I would highly recommend it to family and friends.

The employees were professional and efficient. I consider myself a traveler but have trouble with the international fare served on airplanes. I admit Americans buy their food in the supermarket and we typically don’t eat the ligaments and cartilage. I know that is whiny but as I age, I dislike it more. At least things weren’t covered in cheese. The desserts are terrible! My neighbor didn’t eat her bread so I asked if I could have it. First time for everything but had been traveling a total of 27 hours and was hungry.

The night flight was only 2/3 full, which is always a plus. Room to stretch out for sleeping. Gracious stewardesses, attentive, and slim/attractive (which is rare these days). Good food, and curtesy wine.with meals. Comfortable seats and decent leg room (economy class)

Plane is new and I was upgraded to first class so all was great.

On time service. Seat comfort and the crew service very good .

Only one Hindi movie from LAvto Taipei and same movie from Taipei to Singapore Really horrible and we call it entertainment???

Food was ok. Could have been better. Entertainment was limited, especially for kids.

The flight from Taipei to LAX was the first time we encountered rudeness from the crew. From the gate agents to the in flight crew. We had received such wonderful service going to Bali and on our Bali to Taipei flight that it shocked us when the gate agent was rude and then the rudeness continued on the flight to LAX.

Overall great experience. All four members of my family were seated together without paying extra to reserve seats. Everything was on time. Food was great and healthy. Media entertainment was good. Rock music could be added as a listening choice. No issue with baggages. Flight attendants were friendly and helpful. I would recommend EVA to friends and family.

The crew was very helpful. Food was prepared with great care and tasted wonderful. Movie selection was a bit limited. The bedding on the seat is a little too thin for sleeping.

Bottom seat cushion is almost non existent. Very uncomfortable seat.

Coach seating is debilitating, neither my husband or I can walk the following day

It was NOT pleasant. Started from checking our luggage to the last time getting off the plane. The crew was not friendly, the food was horrible and the seats were too close to each other that I got a bruise on my knee.

Late departure due to large number of wheel chair patrons. Used to having a box of snacks to select from in comfort plus. The flight attendant just rattled off what was available and asked us to pick. Felt rushed and uncomfortable. Seat was great. Prefer having the screen on the seat in front of me instead of having to pull it up from the seat side. Lots of room for my carryon under the seat in front of me.

5 hour delay. They blamed the weather but it was the computer issues they had been dealing with for days.

The flight was canceled two hours before departure, it took over five hours to rebook us on another flight.

Really bad baggage handling. Had my Rimowa bag badly damaged at the latches.

The plane from SNA wouldn’t start after 5 tries. The team gave me an option of flying direct from LAX and giving me a Lyft ride there! Perfect!

Had a broken tray in business class. Crew just shrugged it off.

Everything was great except for the seat. The backrest would not stay in the upright position.

Everything was very good. Was able to change a make run flight leaving on direct earlier in the app -seamless!!! Well done

Delayed by 2.5hrs any longer and they would’ve had to honour their own policy for breaking their own rules and regs. Not cool, especially when I have an infant child that needs to stay on a routine and they get schedules.

Being stick waiting for gate at ORD cause me to almost miss my connecting flight…being deaf United made no no effort to keep me updated as I couldn’t hear the PA

They had three choices for snacks - but you could only have one - and they ran out of the dark chocolate before they made it all the way down the aisle... Packed flight - limited service.

As usual, United scheduling is completely misleading. A 54-minute layover at O’Hare is too short to make a lot of connections, especially since the flight landed “on time” but had to wait on the taxiway 15 minutes for a gate to open up. Then it takes another 10 minutes to exit the plane before one can run to another concourse to catch a connecting flight.

The seats on the aircraft are like sitting in a rock. During the boarding process they recognize Active Duty Military, why don’t they recognize Retired Military. I’ve always preferred Delta, this flight confirmed why I still prefer Delta.

They opened my checked bag and even though my lock was tsa approved, they loose my lock and left my bag just like that. Incompetent people, very upset about it. I’ll try to avoid traveling with united

We fly to Ecuador frequently. Checking in is usually a hassle because most United agents take some time before they can verify that my passport doesn't require a visa to Ecuador. This time the process was even longer due to the cyber attack. But she was really nice to us. So glad we brought plenty of snacks to supplement the 3 flights from SEA to GYE.

when you can say you don't remember being at any point upset during a flight, the airline is winning .

The staff was very friendly. The seats seemed quite small. Overall the flight was pleasant.

Airplane was cold. Flight attendants were rude. Phone charger did not work. No food available.

3hour delay In the last 3 months i had 3 flights and 2 of these had a more than 2:40 hrs delayed

My initial flight to ORD was extended without reason. We circled the airport a few time and then drove on the ground for at least 20 minutes. These kinds of delays are annoying but somewhat expected… it would be nice if the crew would make an announcement to give updates on how long we could expect to be delayed.

The flight was uneventful. What was a problem was I was delayed getting home one entire day because the flight from Sacramento was delayed. That made getting to my connecting flight impossible. I had to stay another night at the hotel and incur that expense as a result.

Experience was fine. Seats were cramped, and we had to wait for repairs before we could take of. Even though the door remained open, we were warned that leaving the plane could cause difficulty trying to fly out later. Staff was pleasant, and climate control was fortunately working. We had trouble at the DFW terminal, but I don't think that was AA's fault.

This flight was fine but had no time to breathe as the connection was late from Sea to ORD.. Super stressful. If we checked bags, the trip would have been very distressed.

Seats were very uncomfortable. I paid extra for a seat with more leg room, the seat was no different than a seat at the back of the plane. Flight attendant was rude.

Boarding, Seating, Flight Attendants, flight was okay. My seat was uncomfortable.

the food choice of packaged chips and popcorn was utterly ridiculous for first class

Check in agent was helpful and nice. Flight was OK. Our flight in Chicago was delayed 8 hours without an explination. This was our journey home. After a horrible flight experience on on the way to our vacation where our plane was diverted for an emergency medical issue, was grounded for hours, we missed our connecting flight by 25 minutes, and it took a day yo get re-booked, this was yet another bad experience that American seemed unwilling to help out with, much less compensate us for the

United agent at FLL excellent - due 55 min conx at ORD rerouted us on an earlier departure via DEN and got home 5 hours earlier than expected

I was mostly pleased. My greatest disappointment was with respect to the timely update to the estimated departure and arrival times. It was especially sad that the arrival time was not updated online once we were in flight so as to allow my wife to arrive on time to the airport. She was not happy.

The space in exit aisle seat was great. Having the entertainment controls in the middle of the armrests is a joke. Your or the passenger next to you will unintentionally push the controls, mainly the sound bar.The placement of the controls need to be on the back of the seats or on the inside of the seats. This crazy placement may only be on the Boeing 737 series but need to be addressed.

Both fights were delayed. Food could be better comparing to other international flights

I needed to catch a United flight. There wasn't enough signage or help on arrival to navigate the transfer.

Seats weren't comfortable, could have used more let room

I found the personal kind and caring. The Problem was not enough people to serve the the customers. The flow was restricted the crowd frustrated by the wait times. Air Canada seems to hire good people but they need backup in order to provide the service we pay for.

The Montreal to Barcelona flight was cancelled half hour before boarding. We had to struggle for hours to find an alternative route through a very long route with 6 hours of transit time in Munich. It wasted almost one full day of our long awaited vacation. We are extremely disappointed.

Fly was cancel, change airline, fly was delay not get back to Mexico until this morning at 5am worse travel experience ever my luggage is lost, I quiet honestly requesting refund of my travel, not to mention have to spend more in food and Uber from the airport to my home was supposed to be a 12 hr day turn a nightmare.

Flight was delayed more than 120 min. I had carry on bag but the airplane was full and they had to get it checked in. I had to wait for the small carry on bag at the airport carousel

Book cheap flights from Seattle to Illinois

Recent round-trip flight deals

 
These are the cheapest round-trip flights from Seattle to Illinois found on KAYAK in the last 72 hours.
12/12Thu
1 stopFrontier
27h 50mSEA-ORD
12/16Mon
1 stopFrontier
8h 09mORD-SEA
$104
11/18Mon
1 stopFrontier
12h 13mSEA-ORD
11/20Wed
1 stopFrontier
9h 07mORD-SEA
$108
12/5Thu
nonstopDelta
3h 59mSEA-ORD
12/7Sat
nonstopDelta
4h 50mORD-SEA
$137
12/5Thu
nonstopDelta
4h 05mSEA-ORD
12/10Tue
1 stopDelta
7h 10mORD-SEA
$147
12/5Thu
nonstopAmerican Airlines
4h 02mSEA-ORD
12/12Thu
nonstopAmerican Airlines
4h 50mORD-SEA
$162
11/24Sun
1 stopSpirit Airlines
12h 17mSEA-ORD
12/3Tue
1 stopSpirit Airlines
25h 27mORD-SEA
$164
11/19Tue
nonstopAmerican Airlines
4h 01mSEA-ORD
11/25Mon
nonstopAmerican Airlines
4h 45mORD-SEA
$175
11/18Mon
1 stopSpirit Airlines
7h 00mSEA-ORD
11/20Wed
2 stopsSpirit Airlines
27h 41mORD-SEA
$181
11/17Sun
nonstopUnited Airlines
3h 57mSEA-ORD
11/21Thu
nonstopUnited Airlines
4h 48mORD-SEA
$208
11/13Wed
2 stopsUnited Airlines
13h 59mSEA-STL
11/16Sat
1 stopUnited Airlines
7h 49mSTL-SEA
$221

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Recent one-way flight deals

 
Only flying one-way? Below are some of the best one-way flight deals from Seattle to Illinois found on KAYAK in the last 72 hours.
12/4Wed
1 stopSpirit Airlines
11h 30mSEA-ORD
$46
11/20Wed
1 stopSpirit Airlines
9h 17mSEA-ORD
$51
1/24Fri
nonstopAlaska Airlines
4h 15mSEA-ORD
$69
3/1Sat
nonstopUnited Airlines
4h 04mSEA-ORD
$82
11/20Wed
nonstopAlaska Airlines
3h 53mSEA-ORD
$85
12/11Wed
nonstopAmerican Airlines
4h 02mSEA-ORD
$94
3/7Fri
nonstopUnited Airlines
3h 54mSEA-ORD
$97
12/11Wed
1 stopDelta
6h 00mSEA-STL
$98
12/10Tue
nonstopAmerican Airlines
4h 02mSEA-ORD
$104
11/10Sun
1 stopDelta
6h 05mSEA-STL
$108

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Last minute flights from Seattle to Illinois

Last minute flight, train and bus deals

 
These last-minute flight deals are the cheapest flights found on KAYAK in the last 72 hours for flights from Seattle to Illinois that are departing in the next 10 days.
11/5Tue
multi-stopFrontier
11h 57mSEA-ORD
11/14Thu
multi-stopFrontier
12h 12mORD-SEA
$126
11/2Sat
multi-stopFrontier
9h 50mSEA-ORD
11/6Wed
multi-stopFrontier
21h 54mORD-SEA
$150
11/5Tue
multi-stopAmerican Airlines
7h 13mSEA-STL
11/7Thu
multi-stopAmerican Airlines
7h 20mSTL-SEA
$216
11/4Mon
multi-stopDelta
6h 05mSEA-STL
11/6Wed
multi-stopDelta
6h 30mSTL-SEA
$311
11/1Fri
multi-stopSpirit Airlines
7h 29mSEA-ORD
11/3Sun
multi-stopSpirit Airlines
33h 23mORD-SEA
$319
11/5Tue
multi-stopSpirit Airlines
27h 54mSEA-ORD
11/14Thu
multi-stopSpirit Airlines
7h 30mORD-SEA
$321
11/4Mon
nonstopAmerican Airlines
4h 04mSEA-ORD
11/14Thu
nonstopAmerican Airlines
4h 49mORD-SEA
$323
11/5Tue
nonstopDelta
4h 05mSEA-ORD
11/20Wed
nonstopDelta
5h 03mORD-SEA
$394
11/4Mon
multi-stopUnited Airlines
9h 04mSEA-STL
11/7Thu
multi-stopUnited Airlines
7h 44mSTL-SEA
$395
11/4Mon
multi-stopUnited Airlines
12h 14mSEA-STL
11/7Thu
multi-stopUnited Airlines
11h 50mSTL-SEA
$400

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Everything you need to know for your flight from Seattle to Illinois

Information on your arrival and departure airports