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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 6/11. 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 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
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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 42 days early can save you up to 98% on average compared to booking a flight this week. If booking 42 days before your flight isn’t an option for you, users have found flights from Seattle to Illinois for as little as $328 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 $594 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 February, with the cheapest ticket starting at $69.

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 2,637,452 searches. Data last updated May 16, 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.
Tue 6/49:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/15$143
Tue 6/49:40 pmSEA - ORD
1 stop6h 56mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/14$147
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/15$154
Tue 6/49:40 pmSEA - ORD
3 stops30h 20mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/15$168
Tue 6/49:35 amSEA - ORD
2 stops23h 57mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/15$178
Tue 6/49:40 pmSEA - ORD
3 stops30h 20mSpirit Airlines
Tue 6/117:00 amORD - SEA
2 stops27h 32mSpirit Airlines
Deal found 5/14$210
Tue 5/219:40 pmSEA - ORD
1 stop17h 16mSpirit Airlines
Mon 6/39:25 pmORD - SEA
3 stops37h 07mSpirit Airlines
Deal found 5/14$255
Fri 5/249:40 pmSEA - ORD
1 stop7h 00mSpirit Airlines
Sat 5/254:05 pmORD - SEA
1 stop18h 40mSpirit Airlines
Deal found 5/16$345
Fri 5/249:40 pmSEA - ORD
1 stop14h 45mSpirit Airlines
Sat 6/19:25 pmORD - SEA
3 stops37h 20mSpirit Airlines
Deal found 5/16$375

Cheap Alaska Airlines flights from Seattle to Illinois

Explore cheap flight options specifically provided by Alaska 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 2,637,452 searches. Data last updated May 16, 2024.
Some of the best deals we've found on Alaska Airlines flights traveling from Seattle to Illinois. Ensure the flight price, dates, time, and airline match your criteria before you book.
Wed 6/512:14 pmSEA - ORD
Nonstop4h 15mAlaska Airlines
Wed 6/129:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/15$149
Wed 6/125:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Mon 6/179:22 pmORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 5/15$179
Wed 5/2911:34 pmSEA - ORD
Nonstop4h 06mAlaska Airlines
Thu 5/308:00 amORD - SEA
1 stop8h 29mAlaska Airlines
Deal found 5/15$213
Wed 5/2911:34 pmSEA - ORD
Nonstop4h 06mAlaska Airlines
Tue 6/48:00 amORD - SEA
1 stop8h 29mAlaska Airlines
Deal found 5/15$218
Tue 9/2410:48 amSEA - ORD
Nonstop4h 10mAlaska Airlines
Tue 10/15:45 pmORD - SEA
1 stop7h 59mAlaska Airlines
Deal found 5/16$232
Fri 6/1410:45 pmSEA - ORD
Nonstop3h 55mAlaska Airlines
Mon 6/179:22 pmORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 5/16$239
Tue 7/210:45 pmSEA - ORD
Nonstop3h 55mAlaska Airlines
Thu 7/119:22 pmORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 5/16$263
Fri 6/75:58 pmSEA - STL
Nonstop4h 01mAlaska Airlines
Sun 6/97:00 amSTL - SEA
Nonstop4h 14mAlaska Airlines
Deal found 5/15$277
Mon 7/110:45 pmSEA - ORD
Nonstop3h 55mAlaska Airlines
Thu 7/186:20 pmORD - SEA
1 stop7h 39mAlaska Airlines
Deal found 5/16$292

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 2,637,452 searches. Prices were last updated on May 16, 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.
Tue 6/48:35 amSEA - ORD
Nonstop4h 15mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/14$141
Tue 6/49:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/15$143
Wed 6/55:45 pmSEA - ORD
Nonstop4h 04mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/15$145
Tue 6/49:40 pmSEA - ORD
1 stop6h 56mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/14$147
Wed 6/512:14 pmSEA - ORD
Nonstop4h 15mAlaska Airlines
Wed 6/129:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/15$149
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/15$154
Sat 6/19:00 amSEA - ORD
1 stop9h 18mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/16$155
Sat 6/83:36 pmSEA - ORD
2 stops12h 01mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/15$160
Mon 6/39:40 pmSEA - ORD
1 stop7h 00mMultiple Airlines
Wed 6/58:00 pmORD - SEA
1 stop14h 02mMultiple Airlines
Deal found 5/15$165

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 2,637,452 searches. Data last updated May 16, 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.
Tue 6/48:35 amSEA - ORD
Nonstop4h 15mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/14$141
Tue 6/49:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/15$143
Wed 6/55:45 pmSEA - ORD
Nonstop4h 04mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/15$145
Tue 6/49:40 pmSEA - ORD
1 stop6h 56mSpirit Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mSpirit Airlines
Deal found 5/14$147
Wed 6/512:14 pmSEA - ORD
Nonstop4h 15mAlaska Airlines
Wed 6/129:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/15$149
Wed 5/299:35 amSEA - ORD
1 stop10h 20mSpirit Airlines
Tue 6/410:52 pmORD - SEA
1 stop11h 40mSpirit Airlines
Deal found 5/15$154
Sat 6/19:00 amSEA - ORD
1 stop9h 18mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/16$155
Sat 6/83:36 pmSEA - ORD
2 stops12h 01mMultiple Airlines
Tue 6/1110:01 pmORD - SEA
1 stop12h 31mMultiple Airlines
Deal found 5/15$160
Mon 6/39:40 pmSEA - ORD
1 stop7h 00mMultiple Airlines
Wed 6/58:00 pmORD - SEA
1 stop14h 02mMultiple Airlines
Deal found 5/15$165

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 2,637,452 searches. Data last updated May 16, 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 6/512:14 pmSEA - ORD
Nonstop4h 15mAlaska Airlines
Wed 6/129:20 pmORD - SEA
Nonstop4h 35mAlaska Airlines
Deal found 5/15$149
Wed 6/125:45 pmSEA - ORD
Nonstop4h 04mAlaska Airlines
Mon 6/179:22 pmORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 5/15$179
Wed 6/510:52 pmSEA - ORD
Nonstop4h 15mAmerican Airlines
Sat 6/85:15 pmORD - SEA
Nonstop4h 33mAmerican Airlines
Deal found 5/15$194
Wed 5/296:00 pmSEA - ORD
Nonstop4h 05mDelta
Fri 5/317:40 pmORD - SEA
Nonstop4h 42mDelta
Deal found 5/16$209
Sat 6/811:59 pmSEA - ORD
Nonstop3h 58mUnited Airlines
Wed 6/127:45 pmORD - SEA
Nonstop4h 38mUnited Airlines
Deal found 5/15$210
Fri 7/57:10 amSEA - ORD
Nonstop4h 03mDelta
Tue 7/167:00 amORD - SEA
Nonstop4h 25mDelta
Deal found 5/15$213
Sat 8/312:30 amSEA - ORD
Nonstop3h 58mUnited Airlines
Sat 8/178:22 pmORD - SEA
Nonstop4h 40mUnited Airlines
Deal found 5/15$215
Sat 6/16:00 pmSEA - ORD
Nonstop4h 06mDelta
Tue 6/116:50 pmORD - SEA
Nonstop4h 44mDelta
Deal found 5/16$219
Sat 6/156:00 pmSEA - ORD
Nonstop3h 58mDelta
Sat 6/226:55 amORD - SEA
Nonstop4h 30mDelta
Deal found 5/16$223

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 2,637,452 searches. Data last updated May 16, 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.
Tue 5/218:14 pmSEA - ORD
1 stop26h 59mFrontier
Mon 6/36:45 pmORD - SEA
1 stop26h 29mFrontier
Deal found 5/14$167
Sat 5/2510:08 pmSEA - ORD
1 stop21h 07mFrontier
Wed 5/297:59 pmORD - SEA
1 stop28h 13mFrontier
Deal found 5/16$176
Sat 5/2510:08 pmSEA - MDW
1 stop11h 01mFrontier
Wed 5/299:10 pmMDW - SEA
1 stop27h 02mFrontier
Deal found 5/15$176
Tue 5/218:14 pmSEA - MDW
1 stop12h 55mFrontier
Mon 6/35:01 amMDW - SEA
1 stop14h 28mFrontier
Deal found 5/14$179
Wed 5/228:04 amSEA - ORD
1 stop15h 09mFrontier
Wed 5/297:59 pmORD - SEA
1 stop28h 13mFrontier
Deal found 5/16$184
Sat 5/2510:22 amSEA - MDW
1 stop8h 44mFrontier
Tue 5/286:00 amMDW - SEA
1 stop27h 34mFrontier
Deal found 5/15$185
Sat 5/2510:08 pmSEA - ORD
1 stop21h 07mMultiple Airlines
Fri 5/318:30 pmORD - SEA
1 stop13h 30mMultiple Airlines
Deal found 5/16$188
Sat 5/2510:08 pmSEA - ORD
1 stop21h 07mFrontier
Thu 5/307:59 pmORD - SEA
1 stop26h 05mFrontier
Deal found 5/16$189
Sat 5/2510:08 pmSEA - ORD
1 stop21h 07mFrontier
Sun 6/27:59 pmORD - SEA
1 stop25h 11mFrontier
Deal found 5/16$192

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 2,637,452 searches. Data last updated May 16, 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 6/119:41 pmSEA - STL
1 stop13h 24mSpirit Airlines
Deal found 5/15$43
Wed 6/56:00 pmSEA - ORD
Nonstop4h 06mDelta
Deal found 5/14$75
Tue 5/289:40 pmSEA - ORD
1 stop6h 50mSpirit Airlines
Deal found 5/15$78
Tue 6/49:40 pmSEA - ORD
1 stop6h 56mSpirit Airlines
Deal found 5/14$79
Tue 6/49:40 pmSEA - STL
1 stop13h 25mSpirit Airlines
Deal found 5/15$79
Tue 8/2012:55 pmSEA - ORD
1 stop9h 45mUnited Airlines
Deal found 5/15$80
Sat 6/19:00 amSEA - ORD
1 stop9h 18mFrontier
Deal found 5/15$85
Mon 6/38:00 pmSEA - MDW
1 stop7h 50mFrontier
Deal found 5/15$85
Tue 9/109:37 amSEA - ORD
1 stop8h 44mFrontier
Deal found 5/15$89

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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$141 - $224

Route

Depart

Return

Price

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 6/4

Nonstop4h 15m

Chicago O'Hare Intl

Tue 6/11

1 stop12h 31m

$141

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Tue 6/4

1 stop10h 20m

Chicago O'Hare Intl

Tue 6/11

1 stop12h 31m

$143

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 6/5

Nonstop4h 04m

Chicago O'Hare Intl

Tue 6/11

1 stop12h 31m

$145

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 6/5

Nonstop4h 15m

Chicago O'Hare Intl

Wed 6/12

Nonstop4h 35m

$149

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 5/30

1 stop9h 45m

Chicago O'Hare Intl

Thu 6/6

1 stop26h 33m

$167

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Fri 7/5

1 stop9h 34m

Chicago O'Hare Intl

Mon 7/8

1 stop17h 07m

$186

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 6/8

Nonstop3h 58m

Chicago O'Hare Intl

Tue 6/11

1 stop6h 58m

$189

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 9/26

Nonstop3h 58m

Chicago O'Hare Intl

Mon 9/30

Nonstop4h 47m

$209

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 6/20

Nonstop4h 15m

Chicago O'Hare Intl

Tue 6/25

Nonstop4h 33m

$224

Flights are sorted by cheapest first

Deals found on 5/14

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 16, 2024.
Read reviews from past customers who have flown Spirit Airlines, Alaska Airlines and Frontier 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
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
6,040 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Alaska Airlines
8.1
Very good
9,157 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Delta
8.0
Very good
10,673 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

WestJet
7.5
Good
2,919 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

United Airlines
7.4
Good
10,924 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Overall

8.2

Crew

8.7

Boarding

8.3

Comfort

8.1

Entertainment

7.8

Food

7.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

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 $141, 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 $225.

  • 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, Tuesday, Thursday, Friday, Saturday.

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

    Per day, 36 flights depart from Seattle to Illinois on average.
    Early Morning (Midnight to 6am) - 6% of flight departures
    Morning (6am - Noon) - 78% of flight departures
    Afternoon (Noon - 6pm) - 6% of flight departures
    Evening (6pm - Midnight) - 11% of flight departures

  • How long is the flight from Seattle to Illinois?

    Airlines like Spirit Airlines, Alaska Airlines, and Frontier fly from Seattle to Illinois in about 4h 15m. The time it takes to get you to your destination can typically vary by up to 6h 05m. 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 Royal Jordanian (100%), Scandinavian Airlines (95%) or SWISS (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 $1,083 for a flight from Seattle to Illinois. The cheapest flight overall is $99 while the most popular route, (Seattle/Tacoma Intl - Chicago O'Hare Intl) is currently priced at $140.

  • 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 5/16.

See more FAQs

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See prices for flight routes from nearby airports that may be better suited for you.

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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 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$98Average$433FlexibilityNo cancel feeOn-timeN/A
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Alaska AirlinesCheapest$99Average$493FlexibilityNo cancel feeOn-time75%
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United AirlinesCheapest$116Average$528FlexibilityNo cancel feeOn-time69%
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FrontierCheapest$120Average$193FlexibilityNo cancel feeOn-time62%
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Spirit AirlinesCheapest$129Average$314FlexibilityNo cancel feeOn-time65%
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American AirlinesCheapest$138Average$524FlexibilityNo cancel feeOn-time71%
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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.
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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 16, 2024.
6%of flight departuresEarly morningMidnight to 6 am
38%of flight departuresMorning6 am to noon
32%of flight departuresAfternoonNoon to 6 pm
24%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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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.

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