$85+ Cheap flights from Illinois to Seattle (SEA)
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 7/8. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — SEA
abr. 22 — abr. 291
1 adult, Economy
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1. Tell us where you want to go
Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Illinois to Seattle
Keep the following information in mind while searching for Illinois to Seattle flight deals. Data was last updated abril 17, 2025.
Most accurate provider | FlightHub 3 stars |
|---|---|
Most trusted provider | eDreams 3 stars |
Round-trip from | $165 (Trip.com) |
One-way from | $85 (Delta) |
Popular in | July |
Cheapest in | February |
Average price | $243 |
Good round-trip deal | $249 or less |
Good one-way deal | $151 or less |
Find flight deals from Illinois to Seattle
Cheapest flights from Illinois to SeattleExplore the most affordable flight options available from Illinois to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.
Explore the most affordable flight options available from Illinois to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on abril 17, 2025.
This Trip.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Trip.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/612:00 pmORD - SEA
Nonstop4h 33mHawaiian Airlines
mar. 5/135:58 pmSEA - ORD
Nonstop4h 01mHawaiian Airlines
Deal found 4/16![Hawaiian Airlines logo]()
$165
This Alaska Airlines deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 5/1412:00 pmORD - SEA
Nonstop4h 33mAlaska Airlines
sáb. 5/1712:40 pmSEA - ORD
Nonstop4h 15mAlaska Airlines
Deal found 4/16![Alaska Airlines logo]()
$169
This Delta deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/246:59 pmORD - SEA
Nonstop4h 43mDelta
mar. 5/275:50 pmSEA - ORD
Nonstop4h 09mDelta
Deal found 4/16![Delta logo]()
$174
This United Airlines deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/137:00 amORD - SEA
1 stop9h 00mUnited Airlines
sáb. 5/1711:59 pmSEA - ORD
Nonstop4h 01mUnited Airlines
Deal found 4/15![United Airlines logo]()
$175
This lastminute.com deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure lastminute.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/176:00 amORD - SEA
Nonstop4h 27mMultiple Airlines
sáb. 5/2411:20 amSEA - ORD
1 stop10h 36mMultiple Airlines
Deal found 4/17![Multiple Airlines logo]()
$187
This Frontier deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 4/288:01 pmMDW - SEA
1 stop6h 43mFrontier
sáb. 5/39:42 pmSEA - MDW
1 stop13h 43mFrontier
Deal found 4/16![Frontier logo]()
$188
This Delta deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 6/26:05 pmSTL - SEA
1 stop7h 42mDelta
jue. 6/510:55 pmSEA - STL
1 stop8h 40mDelta
Deal found 4/16![Delta logo]()
$189
This CheapOair deal was found by Cheapflights users on 4/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/316:00 amORD - SEA
1 stop20h 37mFrontier
jue. 6/57:12 pmSEA - ORD
1 stop26h 47mFrontier
Deal found 4/17![Frontier logo]()
$191
This CheapOair deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
sáb. 5/108:15 pmSTL - SEA
1 stop6h 29mFrontier
dom. 5/188:22 pmSEA - STL
1 stop22h 43mFrontier
Deal found 4/15![Frontier logo]()
$191
This Southwest deal was found by Cheapflights users on 4/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
lun. 6/166:35 pmSTL - SEA
1 stop7h 55mSouthwest
mié. 7/910:40 pmSEA - STL
2 stops10h 55mSouthwest
Deal found 4/15![Southwest logo]()
$194
This Southwest deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mié. 7/302:20 pmMDW - SEA
1 stop7h 40mSouthwest
mié. 8/611:00 pmSEA - MDW
Nonstop4h 05mSouthwest
Deal found 4/16![Southwest logo]()
$209
This Booking.com deal was found by Cheapflights users on 4/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Booking.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
mar. 5/1311:50 amORD - SEA
1 stop14h 20mSpirit Airlines
mar. 5/203:20 pmSEA - ORD
1 stop12h 05mSpirit Airlines
Deal found 4/16![Spirit Airlines logo]()
$210
Cheapflights Fare Finder
Customize your flight search to find flights from Illinois to Seattle 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 2,558,603 searches. Data last updated abril 17, 2025.
Use the filters below to find and compare flights from Illinois to Seattle that are best for you.
Fly from
Illinois
Fly to
Seattle
Route
Depart
Return
Price
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
mar. 5/6
12:00 pm-2:33 pm
Nonstop4h 33m
Seattle/Tacoma Intl
mar. 5/13
5:58 pm-11:59 pm
Nonstop4h 01m
$165
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
sáb. 5/24
7:51 pm-10:30 pm
Nonstop4h 39m
Seattle/Tacoma Intl
dom. 5/25
10:50 am-5:02 pm
Nonstop4h 12m
$174
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
mar. 5/13
7:00 am-2:00 pm
1 stop9h 00m
Seattle/Tacoma Intl
sáb. 5/17
5:18 pm-11:23 pm
Nonstop4h 05m
$175
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
lun. 4/28
8:01 pm-12:44 am
1 stop6h 43m
Seattle/Tacoma Intl
sáb. 5/3
9:42 pm-1:25 pm
1 stop13h 43m
$188
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
lun. 6/2
6:05 pm-11:47 pm
1 stop7h 42m
Seattle/Tacoma Intl
jue. 6/5
10:55 pm-9:35 am
1 stop8h 40m
$189
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
sáb. 5/31
6:00 am-12:37 am
1 stop20h 37m
Seattle/Tacoma Intl
jue. 6/5
7:12 pm-11:59 pm
1 stop26h 47m
$191
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
sáb. 5/10
8:15 pm-12:44 am
1 stop6h 29m
Seattle/Tacoma Intl
dom. 5/18
8:22 pm-9:05 pm
1 stop22h 43m
$191
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
sáb. 5/10
6:00 am-8:30 am
Nonstop4h 30m
Seattle/Tacoma Intl
sáb. 5/17
3:20 pm-5:25 am
1 stop12h 05m
$192
St. LouisSeattle
STL - SEA
STLSEA
Lambert-St Louis
lun. 6/16
6:35 pm-12:30 am
1 stop7h 55m
Seattle/Tacoma Intl
mié. 7/9
10:40 pm-11:35 am
2 stops10h 55m
$194
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
jue. 5/8
2:25 pm-4:57 pm
Nonstop4h 32m
Seattle/Tacoma Intl
sáb. 5/17
5:50 pm-11:59 pm
Nonstop4h 09m
$199
Showing 1-10 of 59 results
Best time to book a flight from Illinois to Seattle
Have a flexible travel schedule? Discover the best time to fly to Seattle from Illinois 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.
Cheapflights Insights
Everything you need to know about your flight from Illinois to Seattle
What is the cheapest month to book a flight from Illinois to Seattle?
Currently, January is the cheapest month in which you can book a flight from Illinois to Seattle (average of $238). Flying from Illinois to Seattle in July is currently the most expensive (average of $411). 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.
What is the cheapest time of day to fly from IL to SEA?
Find hourly flight availability from Illinois to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated abril 17, 2025.
Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Seattle as you normally would.
Weekly flight availability from Illinois to Seattle
Explore weekly flight availability from Illinois to Seattle. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated abril 17, 2025.
The most flights from USIL to SEA are scheduled on a Thursday (52 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (22 on average).
Rainfall in Seattle by month
Plan your trip to Seattle by taking into account the average rainfall totals by month.
In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.
Temperature in Seattle by month
Plan your trip to Seattle by taking into account the average temperature totals by month.
If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).
Reviews of airlines servicing Seattle
Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated abril 17, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Illinois to Seattle have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Food
7.1
Comfort
7.9
Entertainment
7.1
Boarding
8.1
Overall
8.0
Crew
8.5
Reviews
1 / 20
10.0
ExcellentCheri,Jan 2025
FAT - SEA
Related info for your journey
Find useful and relevant information for your journey from Illinois to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Illinois?
Book flights to Illinois if you plan to visit one of these locationsSeaTac
Tukwila
Tacoma
Renton
Lakewood
Ocean Shores
Lacey
Leavenworth
Federal Way
Olympia
Shoreline
Cle Elum
Centralia
Aberdeen
Kent
Lynnwood
Shelton
Silverdale
Redmond
Issaquah
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Illinois to Seattle
See prices for flight routes from nearby airports that may be better suited for you.
Top 8 airlines flying from Illinois to Seattle
Discover the top 8 airlines that operate flights from Illinois to Seattle. 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 2,558,603 searches. Data last updated abril 17, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$114 | Average$257 | FlexibilityNo cancel fee | On-time85% | |
| Cheapest$118 | Average$226 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$120 | Average$238 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$146 | Average$366 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$152 | Average$506 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$153 | Average$506 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$169 | Average$465 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$199 | Average$410 | FlexibilityNo cancel fee | On-time63% |