HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news

Cheap flights from Seattle (SEA) to Illinois from $43

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/14. 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.
SEA — ORD
May 7 — May 141
From?
To?
Tue 5/7
Tue 5/14
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

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

Users have found that booking a flight from Seattle to Illinois at least 39 days early can save you up to 73% on average compared to booking a flight this week. If booking 39 days before your flight isn’t an option for you, users have found flights from Seattle to Illinois for as little as $296 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $575 for flights departing within the next 3 days.

What is the cheapest month to fly from Seattle to Illinois?

Flights from Seattle to Illinois lean towards being more expensive in July. Prices are generally better when you fly from Seattle to Illinois in January, with the cheapest ticket starting at $99.

When is the cheapest time to fly from Seattle to Illinois (SEA - IL)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Illinois as you normally would.

Cheap Spirit Airlines flights from Seattle to Illinois

Explore cheap flight options specifically provided by Spirit Airlines for the route between Seattle and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Take a look at some of the lowest-priced Spirit Airlines flights heading from Seattle to Illinois. It's recommended that users confirm their flight details before booking.
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$143
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$153
Tue 5/289:40 pmSEA - ORD
1 stop6h 50mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$154
Wed 5/299:35 amSEA - ORD
2 stops20h 38mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$156
Tue 5/289:40 pmSEA - ORD
2 stops32h 33mSpirit Airlines
Tue 6/47:08 amORD - SEA
2 stops27h 24mSpirit Airlines
Deal found 5/1$164
Wed 5/299:35 amSEA - ORD
3 stops18h 25mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$178
Tue 5/289:40 pmSEA - ORD
3 stops30h 20mSpirit Airlines
Tue 6/47:08 amORD - SEA
2 stops27h 24mSpirit Airlines
Deal found 5/1$180
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/47:00 amORD - SEA
3 stops39h 09mSpirit Airlines
Deal found 5/1$181
Tue 5/79:19 pmSEA - ORD
1 stop22h 36mSpirit Airlines
Tue 5/1410:52 pmORD - SEA
1 stop11h 53mSpirit Airlines
Deal found 5/1$260

Cheap Delta flights from Seattle to Illinois

Explore cheap flight options specifically provided by Delta for the route between Seattle and Illinois. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Some of the best deals we've found on Delta flights traveling from Seattle to Illinois. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 5/296:00 pmSEA - ORD
Nonstop4h 05mDelta
Wed 6/57:40 pmORD - SEA
Nonstop4h 43mDelta
Deal found 5/1$149
Sat 6/16:00 pmSEA - ORD
Nonstop4h 06mDelta
Tue 6/47:40 pmORD - SEA
Nonstop4h 43mDelta
Deal found 5/1$179
Wed 10/29:25 amSEA - STL
1 stop6h 32mDelta
Tue 10/86:59 pmSTL - SEA
1 stop7h 00mDelta
Deal found 5/1$226
Tue 6/118:30 amSEA - ORD
1 stop11h 27mDelta
Sat 6/156:50 pmORD - SEA
Nonstop4h 44mDelta
Deal found 5/1$230
Sat 6/86:00 pmSEA - ORD
Nonstop3h 58mDelta
Tue 6/186:05 amORD - SEA
1 stop12h 20mDelta
Deal found 5/1$240
Fri 6/76:00 pmSEA - ORD
Nonstop3h 58mDelta
Tue 6/186:05 amORD - SEA
1 stop12h 20mDelta
Deal found 5/1$270
Sat 5/256:00 pmSEA - ORD
Nonstop4h 05mDelta
Tue 5/289:36 amORD - SEA
1 stop12h 51mDelta
Deal found 5/1$280
Thu 5/91:30 pmSEA - ORD
Nonstop4h 11mDelta
Tue 5/147:40 pmORD - SEA
Nonstop4h 42mDelta
Deal found 5/1$403
Thu 5/912:40 amSEA - ORD
1 stop5h 59mDelta
Tue 5/217:40 pmORD - SEA
Nonstop4h 42mDelta
Deal found 5/1$406

Cheap Seattle to Illinois flights in May & June 2024

Find cheap flight options from Seattle to Illinois specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,899,487 searches. Prices were last updated on May 2, 2024.
Check out some of the best flight deals from Seattle to Illinois in 2024. More deals are always being added, so be sure to check back regularly.
Wed 5/299:35 amSEA - ORD
1 stop10h 20mMultiple Airlines
Wed 6/56:00 amORD - SEA
Nonstop4h 27mMultiple Airlines
Deal found 5/1$139
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/2$140
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$143
Wed 5/295:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Wed 6/59:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/1$149
Tue 5/285:45 pmSEA - ORD
Nonstop4h 04mMultiple Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mMultiple Airlines
Deal found 5/1$152
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$153
Tue 5/289:40 pmSEA - ORD
1 stop6h 50mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$154
Wed 5/299:35 amSEA - ORD
2 stops20h 38mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$156
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:58 amORD - SEA
2 stops23h 34mSpirit Airlines
Deal found 5/2$161

Seattle to Illinois 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Illinois in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Check out some of the best flight deals from Seattle to Illinois in 2024. More deals are always being added, so be sure to check back regularly.
Wed 5/299:35 amSEA - ORD
1 stop10h 20mMultiple Airlines
Wed 6/56:00 amORD - SEA
Nonstop4h 27mMultiple Airlines
Deal found 5/1$139
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/2$140
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$143
Wed 5/295:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Wed 6/59:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/1$149
Tue 5/285:45 pmSEA - ORD
Nonstop4h 04mMultiple Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mMultiple Airlines
Deal found 5/1$152
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$153
Tue 5/289:40 pmSEA - ORD
1 stop6h 50mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$154
Wed 5/299:35 amSEA - ORD
2 stops20h 38mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/1$156
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:58 amORD - SEA
2 stops23h 34mSpirit Airlines
Deal found 5/2$161

Non-stop flights to Illinois from Seattle

Discover non-stop flight options from Seattle to Illinois. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
For a shorter flight, select one of these non-stop flights from Seattle to Illinois. Those looking to potentially save on 1 or 2-stop flights from Seattle to Illinois should utilize the search form at the the top of the page.
Wed 5/295:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Wed 6/59:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/1$149
Wed 6/56:00 pmSEA - ORD
Nonstop4h 06mDelta
Sat 6/86:50 pmORD - SEA
Nonstop4h 44mDelta
Deal found 5/2$179
Wed 5/296:00 pmSEA - ORD
Nonstop4h 05mDelta
Tue 6/47:40 pmORD - SEA
Nonstop4h 43mDelta
Deal found 5/2$189
Tue 6/410:39 amSEA - ORD
Nonstop4h 15mAlaska Airlines
Tue 6/47:29 pmORD - SEA
Nonstop4h 31mAlaska Airlines
Deal found 5/1$203
Sat 6/15:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Sat 6/86:00 amORD - SEA
Nonstop4h 27mAlaska Airlines
Deal found 5/1$209
Wed 6/56:00 pmSEA - ORD
Nonstop4h 06mDelta
Sun 6/166:50 pmORD - SEA
Nonstop4h 44mDelta
Deal found 5/1$218
Sat 5/2510:49 pmSEA - ORD
Nonstop4h 06mAlaska Airlines
Tue 5/286:00 amORD - SEA
Nonstop4h 27mAlaska Airlines
Deal found 5/2$219
Thu 5/3011:59 pmSEA - ORD
Nonstop4h 12mAmerican Airlines
Sun 6/28:27 pmORD - SEA
Nonstop4h 38mAmerican Airlines
Deal found 5/1$224
Fri 5/3111:34 pmSEA - ORD
Nonstop4h 06mAlaska Airlines
Sat 6/18:40 amORD - SEA
Nonstop4h 28mAlaska Airlines
Deal found 5/2$233

Seattle to Illinois flights leaving soon

Find last-minute flight options from Seattle to Illinois for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Consider one of these great deals we found on last-minute flights from Seattle to Illinois. It's wise to confirm all flight details are correct before booking.
Wed 5/89:55 amSEA - STL
1 stop8h 44mFrontier
Wed 5/158:04 pmSTL - SEA
1 stop14h 26mFrontier
Deal found 5/1$169
Sat 5/119:32 pmSEA - MDW
1 stop8h 59mFrontier
Tue 5/1410:34 pmMDW - SEA
1 stop12h 21mFrontier
Deal found 5/1$170
Tue 5/79:35 pmSEA - MDW
1 stop12h 03mFrontier
Thu 5/910:59 pmMDW - SEA
1 stop22h 31mFrontier
Deal found 4/30$172
Fri 5/108:30 pmSEA - MDW
1 stop13h 06mFrontier
Tue 5/1410:34 pmMDW - SEA
1 stop12h 21mFrontier
Deal found 5/1$173
Fri 5/109:40 amSEA - STL
1 stop9h 47mFrontier
Mon 5/139:53 pmSTL - SEA
1 stop13h 51mFrontier
Deal found 5/1$173
Fri 5/108:30 pmSEA - MDW
1 stop13h 06mFrontier
Mon 5/139:55 pmMDW - SEA
1 stop13h 49mFrontier
Deal found 5/1$174
Fri 5/108:30 pmSEA - STL
1 stop11h 48mFrontier
Thu 5/1611:06 pmSTL - SEA
1 stop11h 39mFrontier
Deal found 5/1$174
Fri 5/108:30 pmSEA - MDW
1 stop13h 06mFrontier
Fri 5/1711:31 amMDW - SEA
1 stop9h 11mFrontier
Deal found 5/1$178
Fri 5/109:40 amSEA - STL
1 stop9h 47mFrontier
Wed 5/158:04 pmSTL - SEA
2 stops19h 28mFrontier
Deal found 5/1$178

One-way flights to Illinois from Seattle

Search for one-way flight options from Seattle to Illinois. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
Some of the best available deals we've found on one-way flights from Seattle to Illinois. Those seeking round-trip flights from Seattle to Illinois should utilize the search form at the the top of the page.
Tue 5/149:40 pmSEA - STL
1 stop11h 06mSpirit Airlines
Deal found 5/1$43
Tue 5/219:35 amSEA - STL
1 stop23h 11mSpirit Airlines
Deal found 5/1$49
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Deal found 5/1$64
Tue 6/49:35 amSEA - STL
1 stop25h 30mSpirit Airlines
Deal found 5/1$68
Sat 6/16:00 pmSEA - ORD
Nonstop4h 06mDelta
Deal found 5/1$75
Tue 5/149:40 pmSEA - ORD
1 stop6h 50mSpirit Airlines
Deal found 5/1$77
Sat 5/189:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Deal found 5/1$78
Wed 9/2512:55 pmSEA - ORD
1 stop9h 45mUnited Airlines
Deal found 5/1$80
Tue 5/149:40 pmSEA - ORD
3 stops23h 49mSpirit Airlines
Deal found 5/1$82

Find flights from Seattle to Illinois within your budget

Customize your flight search to find flights from Seattle to Illinois 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, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$139 - $247

Route

Depart

Return

Price

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 5/29

1 stop10h 20m

Chicago O'Hare Intl

Wed 6/5

Nonstop4h 35m

$139

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 5/29

1 stop10h 20m

Chicago O'Hare Intl

Tue 6/4

1 stop11h 40m

$143

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 5/29

Nonstop4h 05m

Chicago O'Hare Intl

Wed 6/5

Nonstop4h 43m

$149

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 5/28

Nonstop4h 04m

Chicago O'Hare Intl

Tue 6/4

1 stop11h 40m

$152

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 9/4

1 stop12h 27m

Lambert-St Louis

Mon 9/9

1 stop25h 32m

$168

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 5/29

Nonstop4h 04m

Chicago O'Hare Intl

Fri 6/7

1 stop9h 00m

$188

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Mon 6/3

1 stop6h 28m

Chicago O'Hare Intl

Fri 6/7

1 stop14h 57m

$201

Seattle/Tacoma IntlLambert-St Louis

SEA - STL

SEASTL

Seattle/Tacoma Intl

Wed 10/2

1 stop8h 05m

Lambert-St Louis

Wed 10/9

1 stop6h 27m

$206

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 5/17

Nonstop3h 58m

Chicago O'Hare Intl

Tue 5/21

Nonstop4h 39m

$247

Flights are sorted by cheapest first

Deals found on 5/1

No data available for this route at this time. Please check back soon.

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated May 2, 2024.
Read reviews from past customers who have flown Spirit Airlines, Delta and Alaska Airlines from Seattle to Illinois. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Southwest
8.2
Very good
6,121 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Alaska Airlines
8.1
Very good
9,115 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Delta
8.1
Very good
10,874 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

WestJet
7.6
Good
2,968 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

United Airlines
7.4
Good
11,159 reviews
Southwest
8.2
Very good
6,121 reviews
Check prices

Boarding

8.3

Overall

8.2

Entertainment

7.8

Crew

8.7

Food

7.3

Comfort

8.1

Reviews

1 / 10

I was very relaxed and calm so I took a brief nap. The flight was pretty smooth.

Related info for your journey

Find useful and relevant information for your journey from Seattle to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Seattle to Illinois?

    Most people fly from Seattle/Tacoma Intl (SEA) if they book a flight from Seattle to Illinois. Seattle/Tacoma Intl is conveniently located just 11.4 mi from Seattle’s city center.

  • Can I find flights from Seattle to Illinois for under $200 on Cheapflights?

    Yes, there are multiple flights from Seattle to Illinois for under $200. The cheapest flight booked recently is on Multiple Airlines for just $139, but on average you can expect to pay $161.

  • 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 $226.

  • Are there last-minute flights available from Seattle to Illinois for under $200?

    There are currently 20+ open flights from Seattle to Illinois within the next 7 days for less than $200.

  • What days are nonstop flights available from Seattle to Illinois?

    Days when nonstop flights are available for this flight are: Sunday, Monday, Thursday, Friday, Saturday.

  • How many flights depart from Seattle to Illinois on average per day?

    Per day, 22 flights depart from Seattle to Illinois on average.
    Morning (6am - Noon) - 68% of flight departures
    Afternoon (Noon - 6pm) - 23% of flight departures
    Evening (6pm - Midnight) - 9% of flight departures

  • How long is the flight from Seattle to Illinois?

    Airlines like Spirit Airlines, Delta, and Frontier fly from Seattle to Illinois in about 4h 05m. The time it takes to get you to your destination can typically vary by up to 8h 22m. The distance between Seattle and Illinois is about 1725 mi. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    The cheapest airlines for a one-way flight from Seattle to Illinois are Spirit Airlines ($43), Delta ($75), and United Airlines ($80).

  • 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 - Lambert-St Louis.

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

    The most popular airlines flying from Seattle to Illinois are American Airlines, Alaska Airlines and Delta. Something to consider prior to booking your flight.

  • What are the most reliable airlines from Seattle to Illinois?

    No one likes to see their flight delayed. When booking a flight from Seattle to Illinois consider choosing Scandinavian Airlines (97%), SWISS (95%) or Brussels Airlines (95%) as they are the most reliable in getting you off to your destination on time.

  • What are the cheapest flights from Seattle to Illinois?

    On average you can expect to pay $876 for a flight from Seattle to Illinois. The cheapest flight overall is $87 while the most popular route, (Seattle/Tacoma Intl - Chicago O'Hare Intl) is currently priced at $139.

  • What does SEA to ORD mean?

    These are just IATA (International Air Transport Association) codes. They are used in aviation to identify and differentiate airports. That’s why a Seattle/Tacoma Intl Airport to Chicago O'Hare Intl Airport flight would often be abbreviated as a SEA to ORD flight. Ready for more IATA code knowledge? These are related airports for your current travel destination: Chicago Midway Airport (MDW), Moline Quad-City Airport (MLI), Greater Peoria Airport (PIA), Bloomington-Normal Airport (BMI), Springfield Capital Airport (SPI).

  • Can I find deals for flights from Seattle to Illinois that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Illinois flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Illinois with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Illinois flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

  • Can I find deals for flights from Seattle to Illinois that include hotel bookings?

    Yes. In addition to deals on Seattle to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Seattle to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Seattle to Illinois.

  • Can I find deals for business class flights from Seattle to Illinois?

    Yes. Cheapflights offers flight deals from Seattle to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Illinois that allow pets onboard?

    Many airlines flying from Seattle to Illinois offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Illinois?

    Yes, you can often find last-minute deals on Seattle to Illinois flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to Illinois flight deals updated?

    The Seattle to Illinois flight deals you see on this page were last updated on 5/2.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Seattle to Illinois
See prices for flight routes from nearby airports that may be better suited for you.

Seattle to Los Angeles flights
Seattle to Las Vegas flights
Seattle to Sky Harbor Intl flights
Seattle to Newark flights
Seattle to San Francisco flights
Seattle to O'Hare Intl flights
Seattle to Boston flights
Seattle to Dallas/Fort Worth flights
Seattle to Santa Ana flights
Seattle to Denver flights
Seattle to John F Kennedy Intl flights
Seattle to San Diego flights
Seattle to LaGuardia flights
Seattle to Honolulu flights
Seattle to Ontario flights
Seattle to Burbank flights
Seattle to Dulles Intl flights
Seattle to Oakland flights
Seattle to Hobby flights
Seattle to San Jose flights
Seattle to Minneapolis flights
Seattle to Midway flights
Seattle to Nashville flights
Seattle to Salt Lake City flights
Seattle to Atlanta flights
Seattle to George Bush Intcntl flights
Seattle to Orlando flights
Seattle to Reagan-National flights
Seattle to Austin flights
Seattle to Miami flights
Everett to Las Vegas flights
Seattle to Baltimore flights
Seattle to Detroit flights
Seattle to Fort Lauderdale flights
Seattle to Tampa flights
Seattle to Sacramento flights
Seattle to Philadelphia flights
Seattle to Raleigh flights
Seattle to New Orleans flights
Everett to Los Angeles flights
Seattle to Kailua-Kona flights
Seattle to Kansas City flights
Seattle to Lihue flights
Seattle to Indianapolis flights
Seattle to Palm Springs flights
Everett to San Francisco flights
Seattle to Kahului flights
Seattle to Tucson flights
Everett to Sky Harbor Intl flights
Seattle to Milwaukee flights

Top 6 airlines flying from Seattle to Illinois

Discover the top 6 airlines that operate flights from Seattle to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,899,487 searches. Data last updated May 2, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$98Average$435FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Alaska AirlinesCheapest$99Average$493FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapest$114Average$529FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
FrontierCheapest$120Average$193FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$129Average$325FlexibilityNo cancel feeOn-time65%
Search Spirit Airlines flights
American AirlinesCheapest$139Average$525FlexibilityNo cancel feeOn-time71%
Search American Airlines flights
Fort Lauderdale to Miami flights
Denver to Boston flights
Phoenix to Hawaii flights
San Diego to San Francisco flights
Atlanta to Orlando flights
New York to New Delhi flights
Miami to Madrid flights
USA to Germany flights
USA to India flights
Boston to Mumbai flights
Chicago to Las Vegas flights
Seattle to Indiana flights

Search flights from Seattle to Illinois by cabin class

Find flights from Seattle to Illinois, based on your preferred cabin class, be it economy, premium economy, business, or first class.
First Class
Business Class
Prem Econ Class
Economy Class

Hourly flight availability from Seattle to Illinois

Find hourly flight availability from Seattle to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 2, 2024.
23%of flight departuresEarly morningMidnight to 6 am
42%of flight departuresMorning6 am to noon
23%of flight departuresAfternoonNoon to 6 pm
12%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Book a flight to one of these trending destinations

User searches for flights to these destinations increased 20% or more in the past 90 days compared to other destinations
Flights to Saint Peter Jersey
Flights to Kirkwall Arpt
Flights to Skiathos
Flights to Naxos
Flights to Ningbo Lishe Intl
Flights to Edremit/Korfez
Flights to Bourgas
Flights to Bodø
Flights to Pellston Emmet County
Flights to Cornwall Newquay
Flights to Ordu/Giresun
Flights to Batumi
Flights to Mason City
Flights to Biarritz Parme
Flights to Zakynthos Dionsios Salomos
Flights to Cortez Montezuma County
Flights to Clermont-Ferrand Aulnat
Flights to Nevsehir
Flights to Hyannis Barnstable
Flights to Girona Costa Brava
Flights to Kagoshima
Flights to Perugia Sant Egidio
Flights to Oran Es Senia
Flights to Chios

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Illinois?

Cheapflights helps you search for flights from Seattle to Illinois via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Illinois?

Cheapflights taps into our reliable network of hundreds of airlines and travel agencies to find the best deals for flights from Seattle to Illinois for you. Better yet — we are completely free to use.

Can Cheapflights find flights from Seattle to Illinois with no change fees?

Yes, we can. To see specific flights from Seattle to Illinois with no change fees, users can toggle flexible booking options after using the search form above to find flights.

Can Cheapflights notify me if prices for flights from Seattle to Illinois become cheaper?

Yes, Cheapflights offers price alerts on Seattle to Illinois flights so you can book your travel at the perfect time. Price Alerts can be enabled by clicking the bell icon next to the flight deals above and providing your email address where you want to receive the alerts.

100% Free
Cheapflights is completely free to use, so you can start saving the moment you arrive.
Book with Flexibility
Our users can plan ahead with confidence and find flights with no change fees
Travel Smart
Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.
View all available airlines