$53+ 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 2/26. Fares are subject to change and may not be available on all flights or dates of travel.
Find cheap flights from Illinois to Seattle with Cheapflights
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
We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.3. Compare prices and book
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
Discover tips and strategies to find the most affordable flight options for your journey from Illinois (USIL) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated January 21, 2025.
Round-trip from | $178 (Delta) |
|---|---|
One-way from | $53 (Trip.com) |
Good round-trip deal | $179 or less |
Good one-way deal | $85 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 January 21, 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 January 21, 2025.
This Delta deal was found by Cheapflights users on 1/21. 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.
This Expedia deal was found by Cheapflights users on 1/20. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This FlightHub deal was found by Cheapflights users on 1/20. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This eDestinos deal was found by Cheapflights users on 1/20. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This United Airlines deal was found by Cheapflights users on 1/20. 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.
This Mytrip deal was found by Cheapflights users on 1/20. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This American Airlines deal was found by Cheapflights users on 1/21. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Alaska Airlines deal was found by Cheapflights users on 1/20. 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.
This Kissandfly.com deal was found by Cheapflights users on 1/20. 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 Kissandfly.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
This Southwest deal was found by Cheapflights users on 1/20. 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.
This Delta deal was found by Cheapflights users on 1/21. 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.
This Trip.com deal was found by Cheapflights users on 1/20. 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.
Find flights from Illinois to Seattle within your budget
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 January 21, 2025.
Fly from
Fly to
Route
Depart
Return
Price
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Tue 2/18
7:00 am-9:58 am
Nonstop4h 58m
Seattle/Tacoma Intl
Fri 2/21
5:55 pm-11:56 pm
Nonstop4h 01m
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Mon 3/10
6:40 am-12:02 pm
1 stop7h 22m
Seattle/Tacoma Intl
Sun 3/16
11:38 am-5:31 am
1 stop15h 53m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 2/15
4:30 pm-12:25 am
1 stop9h 55m
Seattle/Tacoma Intl
Mon 2/17
11:59 pm-5:53 am
Nonstop3h 54m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Thu 2/13
5:10 am-7:54 pm
2 stops16h 44m
Seattle/Tacoma Intl
Wed 2/26
5:41 pm-1:25 pm
2 stops17h 44m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Tue 2/18
7:59 pm-10:42 pm
Nonstop4h 43m
Seattle/Tacoma Intl
Sat 2/22
4:58 pm-4:53 am
1 stop9h 55m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 3/1
11:35 am-12:25 am
2 stops14h 50m
Seattle/Tacoma Intl
Mon 3/10
12:41 pm-6:36 am
1 stop15h 55m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 3/15
8:25 pm-11:07 pm
Nonstop4h 42m
Seattle/Tacoma Intl
Sat 3/22
11:59 pm-5:59 am
Nonstop4h 00m
ChicagoSeattle
ORD - SEA
ORDSEA
Chicago O'Hare Intl
Sat 2/15
7:00 pm-8:15 am
1 stop15h 15m
Seattle/Tacoma Intl
Sat 2/22
6:03 pm-11:59 pm
Nonstop3h 56m
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Sat 3/1
6:40 am-12:46 pm
1 stop8h 06m
Seattle/Tacoma Intl
Wed 3/5
6:25 am-12:17 am
3 stops15h 52m
ChicagoSeattle
MDW - SEA
MDWSEA
Chicago Midway
Mon 3/3
5:35 pm-8:10 pm
Nonstop4h 35m
Seattle/Tacoma Intl
Thu 3/6
9:05 am-3:00 pm
Nonstop3h 55m
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.
Travel insights for flights from Illinois to Seattle
Get recent, data-driven insights about flights from Illinois to Seattle including ideal travel times, pricing trends, and more.
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 January 21, 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 January 21, 2025.
The most flights from USIL to SEA are scheduled on a Monday (26 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (5 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 January 21, 2025.
See what other customers who have flown with Spirit Airlines, Delta and Southwest from Illinois to Seattle have to say. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
Comfort
Food
Boarding
Overall
Entertainment
Crew
Reviews
We BARELY made the connection and when we got onboard we were treated like disobedient children who should have arrived earlier because we had to ask other passengers to move so we could sit with our kids. The flight attendants on the first flight were nice but the second one, they were snippy and fairly rude.
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.
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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 7 airlines flying from Illinois to Seattle
Discover the top 7 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 January 21, 2025.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$118 | Average$521 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$122 | Average$222 | FlexibilityNo cancel fee | On-time62% | |
| Cheapest$124 | Average$242 | FlexibilityNo cancel fee | On-time65% | |
| Cheapest$126 | Average$409 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$147 | Average$530 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$157 | Average$481 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$186 | Average$400 | FlexibilityNo cancel fee | On-time63% |