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Cheap flights from Seattle (SEA) to Illinois from $70

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 7/4. 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.
SEA — ORD
Jun 22 — Jun 291
From?
To?
Sat 6/22
Sat 6/29
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 87% 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 $320 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 $590 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.

What is the cheapest time of day to fly from SEA to 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 Seattle to Illinois flights in June & July 2024

Find cheap flight options from Seattle to Illinois specifically for the months of June and July 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 3,263,674 searches. Prices were last updated on June 17, 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 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Tue 7/166:00 amORD - SEA
1 stop27h 00mFrontier
Deal found 6/16$147
Wed 7/105:40 pmSEA - ORD
Nonstop3h 59mAlaska Airlines
Tue 7/169:22 pmORD - SEA
Nonstop4h 37mAlaska Airlines
Deal found 6/17$149
Wed 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Tue 7/168:26 pmORD - SEA
2 stops18h 08mFrontier
Deal found 6/16$152
Thu 7/49:28 amSEA - ORD
1 stop9h 49mMultiple Airlines
Tue 7/96:00 amORD - SEA
1 stop27h 00mMultiple Airlines
Deal found 6/16$153
Wed 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Tue 7/166:00 amORD - SEA
1 stop27h 00mFrontier
Deal found 6/15$154
Wed 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Tue 7/168:26 pmORD - SEA
2 stops18h 08mFrontier
Deal found 6/17$158
Wed 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Tue 7/168:26 pmORD - SEA
2 stops18h 08mFrontier
Deal found 6/15$159
Thu 7/49:28 amSEA - ORD
1 stop9h 49mMultiple Airlines
Tue 7/96:00 amORD - SEA
1 stop27h 00mMultiple Airlines
Deal found 6/16$162
Tue 7/301:34 pmSEA - MDW
2 stops13h 11mFrontier
Sun 8/47:56 pmMDW - SEA
1 stop14h 44mFrontier
Deal found 6/16$169

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 3,263,674 searches. Data last updated June 17, 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.
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Mon 8/512:41 pmSTL - SEA
1 stop8h 52mFrontier
Deal found 6/16$144
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Mon 8/512:41 pmSTL - SEA
1 stop8h 52mFrontier
Deal found 6/16$145
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Mon 8/512:12 pmSTL - SEA
2 stops26h 22mFrontier
Deal found 6/16$149
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Tue 8/610:59 pmSTL - SEA
1 stop10h 01mFrontier
Deal found 6/16$150
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Sat 8/38:02 pmSTL - SEA
1 stop14h 15mFrontier
Deal found 6/16$151
Mon 7/159:45 pmSEA - STL
1 stop21h 46mFrontier
Wed 7/2410:32 pmSTL - SEA
1 stop25h 37mFrontier
Deal found 6/16$153
Mon 7/229:45 pmSEA - STL
1 stop21h 46mFrontier
Tue 8/610:59 pmSTL - SEA
1 stop10h 01mFrontier
Deal found 6/17$154
Wed 7/109:40 pmSEA - STL
1 stop20h 17mFrontier
Tue 7/3010:32 pmSTL - SEA
2 stops16h 02mFrontier
Deal found 6/16$158
Tue 7/161:34 pmSEA - STL
2 stops29h 57mFrontier
Wed 7/2410:32 pmSTL - SEA
1 stop25h 37mFrontier
Deal found 6/16$159

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 3,263,674 searches. Data last updated June 17, 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.
Sat 6/299:00 amSEA - STL
1 stop10h 00mFrontier
Tue 7/97:49 pmSTL - SEA
1 stop24h 02mFrontier
Deal found 6/15$186
Thu 6/279:42 pmSEA - STL
1 stop12h 12mFrontier
Mon 7/87:51 pmSTL - SEA
1 stop14h 47mFrontier
Deal found 6/16$188
Thu 6/279:42 pmSEA - STL
1 stop12h 12mFrontier
Tue 7/93:47 pmSTL - SEA
1 stop17h 13mFrontier
Deal found 6/16$195
Fri 6/2810:03 pmSEA - STL
1 stop10h 39mFrontier
Mon 7/87:51 pmSTL - SEA
1 stop14h 47mFrontier
Deal found 6/16$197
Mon 6/2410:03 pmSEA - STL
1 stop10h 39mFrontier
Mon 7/87:51 pmSTL - SEA
1 stop14h 47mFrontier
Deal found 6/16$210
Mon 6/2410:03 pmSEA - STL
1 stop10h 39mFrontier
Tue 7/97:49 pmSTL - SEA
1 stop24h 02mFrontier
Deal found 6/16$211
Thu 6/279:42 pmSEA - STL
1 stop12h 12mFrontier
Thu 7/412:05 pmSTL - SEA
1 stop12h 00mFrontier
Deal found 6/16$223
Thu 6/279:42 pmSEA - STL
1 stop12h 12mFrontier
Wed 7/1012:23 pmSTL - SEA
1 stop7h 28mFrontier
Deal found 6/16$232
Sat 6/299:00 amSEA - STL
1 stop10h 00mFrontier
Fri 7/1212:46 pmSTL - SEA
1 stop8h 49mFrontier
Deal found 6/15$238

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 3,263,674 searches. Data last updated June 17, 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.
Thu 7/49:28 amSEA - ORD
1 stop9h 49mSpirit Airlines
Deal found 6/17$70
Wed 7/106:51 pmSEA - MDW
1 stop8h 42mFrontier
Deal found 6/16$70
Wed 7/106:51 pmSEA - MDW
1 stop8h 42mFrontier
Deal found 6/16$71
Tue 7/1610:45 pmSEA - ORD
Nonstop3h 55mAlaska Airlines
Deal found 6/16$72
Tue 9/176:07 amSEA - ORD
Nonstop4h 10mAlaska Airlines
Deal found 6/16$75
Wed 7/109:40 pmSEA - ORD
1 stop24h 55mFrontier
Deal found 6/16$76
Tue 7/99:52 pmSEA - MDW
1 stop11h 36mFrontier
Deal found 6/16$76
Mon 7/89:49 pmSEA - ORD
1 stop29h 42mFrontier
Deal found 6/16$77
Wed 7/38:59 pmSEA - ORD
1 stop7h 25mSpirit Airlines
Deal found 6/17$78

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 3,263,674 searches. Data last updated June 17, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$141 - $238

Route

Depart

Return

Price

Seattle/Tacoma IntlChicago Midway

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Wed 7/10

1 stop8h 42m

Chicago Midway

Wed 7/17

1 stop9h 10m

$141

Seattle/Tacoma IntlChicago Midway

SEA - MDW

SEAMDW

Seattle/Tacoma Intl

Wed 7/10

1 stop8h 42m

Chicago Midway

Tue 7/16

1 stop11h 15m

$143

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 7/10

Nonstop3h 59m

Chicago O'Hare Intl

Tue 7/16

Nonstop4h 37m

$149

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 7/4

1 stop9h 49m

Chicago O'Hare Intl

Tue 7/9

1 stop27h 00m

$153

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Wed 9/4

1 stop8h 03m

Chicago O'Hare Intl

Wed 9/11

Nonstop4h 33m

$163

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sun 7/28

1 stop16h 59m

Chicago O'Hare Intl

Mon 7/29

1 stop9h 15m

$175

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Thu 9/26

Nonstop4h 04m

Chicago O'Hare Intl

Mon 9/30

Nonstop4h 31m

$178

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sat 7/13

1 stop8h 44m

Chicago O'Hare Intl

Wed 7/17

1 stop15h 44m

$201

Seattle/Tacoma IntlChicago O'Hare Intl

SEA - ORD

SEAORD

Seattle/Tacoma Intl

Sun 6/30

Nonstop3h 58m

Chicago O'Hare Intl

Mon 7/15

Nonstop4h 39m

$238

Flights are sorted by cheapest first

Deals found on 6/15

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

Best time to book a flight from Seattle to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Seattle with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

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 June 17, 2024.
Read reviews from past customers who have flown Alaska Airlines, Frontier and Delta 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.
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Alaska Airlines
8.1
Very good
9,278 reviews
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

Delta
8.0
Very good
10,000 reviews
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

WestJet
7.5
Good
2,802 reviews
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

United Airlines
7.4
Good
10,000 reviews
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

American Airlines
7.3
Good
10,000 reviews
Alaska Airlines
8.1
Very good
9,278 reviews

Overall

8.1

Entertainment

7.3

Food

7.3

Comfort

7.9

Boarding

8.2

Crew

8.6

Reviews

1 / 10

I paid for an aisle seat and found I was bumped to the middle seat. No entertainment at all, bathroom was so tiny, a woman had a hard time in there. Seems it was considered for men only. This was my first time on Alaska airlines. I don’t think I want to fly on Alaska Airlines again.

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 Frontier for just $141, but on average you can expect to pay $148.

  • 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 $199.

  • 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: Monday, Wednesday, Thursday, Friday, Saturday.

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

    Per day, 17 flights depart from Seattle to Illinois on average.
    Early Morning (Midnight to 6am) - 12% of flight departures
    Morning (6am - Noon) - 71% of flight departures
    Afternoon (Noon - 6pm) - 12% of flight departures
    Evening (6pm - Midnight) - 6% of flight departures

  • How long is the flight from Seattle to Illinois?

    Airlines like Frontier and Alaska Airlines fly from Seattle to Illinois in about 3h 59m. The time it takes to get you to your destination can typically vary by up to 4h 43m. 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 ($70), Frontier ($70), and Alaska Airlines ($72).

  • 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 reliable airlines from Seattle to Illinois?

    No one likes to see their flight delayed. When booking a flight from Seattle to Illinois consider choosing Avianca (100%), SWISS (93%) or Scandinavian Airlines (93%) 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 $807 for a flight from Seattle to Illinois. The cheapest flight overall is $104 while the most popular route, (Seattle/Tacoma Intl - Chicago O'Hare Intl) is currently priced at $149.

  • 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 6/17.

  • 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 is the cheapest month to book a flight from Seattle to Illinois?

    Currently, February is the cheapest month in which you can book a flight from Seattle to Illinois (average of $244). Flying from Seattle to Illinois in July is currently the most expensive (average of $320). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Seattle to Illinois
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 3,263,674 searches. Data last updated June 17, 2024.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$84Average$434FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$90Average$484FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$108Average$514FlexibilityNo cancel feeOn-time71%
FrontierCheapest$121Average$206FlexibilityNo cancel feeOn-time62%
United AirlinesCheapest$126Average$559FlexibilityNo cancel feeOn-time69%
Spirit AirlinesCheapest$129Average$302FlexibilityNo cancel feeOn-time65%
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 June 17, 2024.
13%of flight departuresEarly morningMidnight to 6 am
44%of flight departuresMorning6 am to noon
31%of flight departuresAfternoonNoon to 6 pm
12%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

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