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Cheap flights from Seattle (SEA) to Illinois (IL)

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How to find the cheapest flight from
Seattle (SEA) to Illinois

How far in advance should I book a flight from Seattle to Illinois?

Travelers have found it’s best to book a flight 37 days in advance to save up to 10% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 37 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from Seattle to Illinois 1-2 weeks in advance for as low as $177, or $177 for flights within the next 24 hours.

Cheap flights from Seattle to Illinois in August, September 2020

The best prices found for SEA to Illinois flights for August, September
17 Aug - 24 Aug
$89pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Aug - 5 Aug
$93pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
22 Aug - 6 Sep
$97pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Seattle to Illinois 2020 flight deals

Cheap flights to Illinois from Seattle found for this year
17 Aug - 24 Aug
$89pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
3 Aug - 6 Aug
$93pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
22 Aug - 6 Sep
$97pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl

Non-stop flights to Illinois from Seattle

Save time with Seattle to Illinois direct flight deals
15 Oct - 18 Oct
$105pp
SEA
Seattle/Tacoma Intl
Major Airline
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Major Airline
Non-Stop
SEA
Seattle/Tacoma Intl
15 Sep - 20 Sep
$111pp
SEA
Seattle/Tacoma Intl
Spirit Airlines
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
Non-Stop
SEA
Seattle/Tacoma Intl
10 Sep - 14 Sep
$117pp
SEA
Seattle/Tacoma Intl
Delta
Non-Stop
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Delta
Non-Stop
SEA
Seattle/Tacoma Intl

Last minute flights from Seattle to Illinois

Late deals on round-trip flights to Illinois from Seattle, departing today and this week
26 Jul - 29 Jul
$98pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Frontier
 
1 STOP
SEA
Seattle/Tacoma Intl
27 Jul - 3 Aug
$108pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Spirit Airlines
 
1 STOP
SEA
Seattle/Tacoma Intl
27 Jul - 28 Aug
$117pp
SEA
Seattle/Tacoma Intl
Multiple Airlines
 
1 STOP
ORD
Chicago O'Hare Intl
ORD
Chicago O'Hare Intl
Alaska Airlines
Non-Stop
SEA
Seattle/Tacoma Intl

One-way flights to Illinois from Seattle

The cheapest one-way flights from Seattle to Illinois
6:30 pm - 4:53 am
Sun Country Air
1 Stop
8h 23m
SEA - ORD
Sun Country Air
$63
Ovago
8:40 pm - 4:36 am
Delta
1 Stop
5h 56m
SEA - MDW
Delta
$64
Delta
4:14 pm - 3:11 pm
Spirit Airlines
1 Stop
20h 57m
SEA - ORD
Spirit Airlines
$75
Kiwi.com

Related info for your journey

Useful info, stats and facts about Seattle to Illinois flights.

Flight FAQs

From Seattle to Illinois

Are flight prices decreasing from Seattle to Illinois due to COVID-19 (coronavirus)?

At this time, Cheapflights has noticed price decreases for many domestic flights due to COVID-19. Travel is not necessarily recommended at this time, and flights may be prone to cancellation: please check with local authorities in both Seattle and Illinois for travel alerts, and be sure to review the airline's cancellation policy and travel advisories before booking. For more information, please view our post on what to know about COVID-19 (coronavirus) and travel.

Can I find flights from Seattle to Illinois for under $100 on Cheapflights?

Yes, there are multiple flights from Seattle to Illinois for under $100. The cheapest flight booked recently is on Multiple Airlines for just $93, but on average you can expect to pay $108.

Are there nonstop flights from Seattle to Illinois for under $200 on Cheapflights?

Cheapflights has at least 20 direct flights from Seattle to Illinois under $200. A good price for a nonstop flight from Seattle to Illinois is less than $141.

Are there last-minute flights available from Seattle to Illinois for under $100?

There are currently 20+ open flights from Seattle to Illinois within the next 7 days for less than $100.

What days are nonstop flights available from Seattle to Illinois?

Nonstop flights can be found on the following days: Sunday, Thursday, Friday, Saturday.

What are the most popular airlines that fly from Seattle to Illinois?

When booking a flight from Seattle to Illinois, you may want to consider flying on Major Airline, American Airlines or Alaska Airlines as they are the most popular for this route.

What are the most popular routes from Seattle to Illinois?

The most popular flight routes from Seattle to Illinois are Seattle/Tacoma Intl - Chicago O'Hare Intl, Seattle/Tacoma Intl - Chicago Midway and Seattle/Tacoma Intl - Moline Quad-City.

What are the cheapest Flights from Seattle to Illinois?

While on average a flight from Seattle to Illinois is generally $223, our data shows the cheapest flight currently is $82. When looking at the most popular route, (Seattle/Tacoma Intl - Chicago O'Hare Intl), you can expect to pay $88 for that flight.

What are the most reliable airlines from Seattle to Illinois?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Seattle to Illinois on time: Royal Jordanian(100%), Iberia(100%), Singapore Airlines(100%.)

How long is the flight from Seattle to Illinois?

There are many flights that can get you from Seattle to Illinois in 3h 42m. Fly via Delta or Allegiant Air to get the fastest option. All flights are typically nonstop.

What are the cheapest airlines flying from Seattle to Illinois round-trip?

According to our current data, Spirit Airlines ($101), Allegiant Air ($119), and Delta ($121) offers the cheapest pricing from Seattle to Illinois.

What are the cheapest airlines to fly from Seattle to Illinois one-way?

To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $31. Delta flights start at $59 while deals on Sun Country Air start at $63 one-way.

Arrival points for flights from Seattle to Illinois

Destination information for Illinois

Things to know before you go. Useful info for your trip from Seattle to Illinois
Flight duration
4h 10m

Airports servicing Seattle

Seattle King County/Boeing (BFI)
Seattle Lake Union Spb (LKE)

Airports servicing

Bloomington (BMI)
Champaign (CMI)
Decatur (DEC)
Moline (MLI)
Marion (MWA)
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