Users have found that booking a flight from Seattle to Illinois at least 27 days early can save you up to 86% on average compared to booking a flight this week. If booking 27 days before your flight isn’t an option for you, users have found flights from Seattle to Illinois for as little as $338 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.
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.
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.
Fly from
Fly to
Budget
$100 - $224
Route
Depart
Return
Price
Seattle/Tacoma IntlLambert-St Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Tue 6/4
1 stop13h 25m
Lambert-St Louis
Tue 6/11
2 stops19h 09m
Seattle/Tacoma IntlLambert-St Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Tue 6/4
1 stop13h 25m
Lambert-St Louis
Mon 6/10
1 stop20h 18m
Seattle/Tacoma IntlLambert-St Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Tue 6/4
1 stop13h 25m
Lambert-St Louis
Sat 6/8
1 stop15h 08m
Seattle/Tacoma IntlChicago O'Hare Intl
SEA - ORD
SEAORD
Seattle/Tacoma Intl
Sat 6/15
Nonstop3h 55m
Chicago O'Hare Intl
Sat 6/22
Nonstop4h 31m
Seattle/Tacoma IntlChicago Midway
SEA - MDW
SEAMDW
Seattle/Tacoma Intl
Wed 9/11
1 stop17h 03m
Chicago Midway
Wed 9/18
1 stop23h 01m
Seattle/Tacoma IntlChicago O'Hare Intl
SEA - ORD
SEAORD
Seattle/Tacoma Intl
Fri 7/26
1 stop15h 29m
Chicago O'Hare Intl
Mon 7/29
1 stop15h 17m
Seattle/Tacoma IntlLambert-St Louis
SEA - STL
SEASTL
Seattle/Tacoma Intl
Mon 9/30
1 stop7h 50m
Lambert-St Louis
Tue 10/8
1 stop7h 00m
Seattle/Tacoma IntlChicago O'Hare Intl
SEA - ORD
SEAORD
Seattle/Tacoma Intl
Thu 8/15
Nonstop3h 59m
Chicago O'Hare Intl
Mon 8/19
1 stop6h 46m
Seattle/Tacoma IntlChicago O'Hare Intl
SEA - ORD
SEAORD
Seattle/Tacoma Intl
Mon 6/10
Nonstop4h 15m
Chicago O'Hare Intl
Wed 6/12
Nonstop4h 49m
No data available for this route at this time. Please check back soon.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
Boarding
Comfort
Crew
Entertainment
Food
Overall
Reviews
Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.
4%of flight departures | Early morningMidnight to 6 am |
---|---|
44%of flight departures | Morning6 am to noon |
25%of flight departures | AfternoonNoon to 6 pm |
27%of flight departures | Evening6 pm to midnight |
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.
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.
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.
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.