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$74+ Cheap flights from Illinois to Oregon

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 10/18. Fares are subject to change and may not be available on all flights or dates of travel.
ORD — PDX
Oct 15 — Oct 221
Wed 10/15
Wed 10/22
1 adult, Economy
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Cheap flight deals from Illinois to Oregon

Keep the following information in mind while searching for Illinois to Oregon flight deals. Data was last updated September 15, 2025.

Round-trip from

$158
(Frontier)

One-way from

$74
(United Airlines)

Popular in

December

Cheapest in

January

Average price

$278

Good round-trip deal

$249 or less

Good one-way deal

$89 or less
From Illinois to Oregon
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One-way flight from Illinois to Oregon
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Highest demand for flights based on searches. 2% potential increase in price ($8 potential increase over avg. RT price).
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Cheapest flight prices on average. 3% potential price decrease ($11 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from Illinois to Oregon.
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Price to beat on a one-way flight from Illinois to Oregon.
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Find flight deals from Illinois to Oregon

Cheapest flights from Illinois to Oregon
Explore the most affordable flight options available from Illinois to Oregon. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 15, 2025.

This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/256:00 amORD - BOI
1 stop8h 10mHawaiian Airlines
Mon 10/278:50 pmBOI - ORD
1 stop8h 32mHawaiian Airlines
Deal found 9/13$166
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/227:15 amORD - BOI
1 stop29h 28mFrontier
Thu 10/3012:33 pmBOI - ORD
1 stop11h 10mFrontier
Deal found 9/13$168
This Frontier deal was found by Cheapflights users on 9/13. 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.
Thu 10/236:50 amORD - BOI
1 stop5h 53mFrontier
Thu 10/3012:33 pmBOI - ORD
1 stop11h 10mFrontier
Deal found 9/13$173
This Delta deal was found by Cheapflights users on 9/13. 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.
Fri 10/242:25 pmORD - BOI
1 stop8h 41mDelta
Tue 10/281:39 pmBOI - ORD
1 stop9h 19mDelta
Deal found 9/13$183
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/223:50 pmORD - BOI
1 stop8h 32mHawaiian Airlines
Tue 10/285:54 amBOI - ORD
1 stop6h 15mHawaiian Airlines
Deal found 9/13$185
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:00 amORD - BOI
1 stop8h 10mAlaska Airlines
Mon 10/278:50 pmBOI - ORD
1 stop8h 32mAlaska Airlines
Deal found 9/13$188
This Cheapflightsfares deal was found by Cheapflights users on 9/13. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/296:15 amORD - BOI
1 stop15h 16mSpirit Airlines
Fri 10/39:26 pmBOI - ORD
1 stop13h 25mSpirit Airlines
Deal found 9/13$189
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/233:50 pmORD - BOI
1 stop8h 32mHawaiian Airlines
Tue 10/285:54 amBOI - ORD
1 stop6h 15mHawaiian Airlines
Deal found 9/13$192
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/226:00 amORD - BOI
1 stop8h 10mHawaiian Airlines
Wed 10/295:54 amBOI - ORD
1 stop6h 15mHawaiian Airlines
Deal found 9/13$197
This Kiwi.com deal was found by Cheapflights users on 9/13. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:00 amORD - BOI
1 stop8h 10mHawaiian Airlines
Sun 10/268:50 pmBOI - ORD
1 stop8h 32mHawaiian Airlines
Deal found 9/13$198
This Orbitz deal was found by Cheapflights users on 9/13. 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 Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/257:05 amORD - PDX
1 stop6h 43mMultiple Airlines
Tue 10/287:00 amPDX - ORD
Nonstop4h 09mMultiple Airlines
Deal found 9/13$207
This Delta deal was found by Cheapflights users on 9/13. 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.
Wed 11/54:45 pmSTL - BOI
1 stop8h 09mDelta
Mon 11/103:00 pmBOI - STL
1 stop7h 23mDelta
Deal found 9/13$207

Cheapflights Fare Finder

 
Customize your flight search to find flights from Illinois to Oregon 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 September 15, 2025.
Use the filters below to find and compare flights from Illinois to Oregon that are best for you.

Fly from

Illinois

Fly to

Oregon

Route

Depart

Return

Price

St. LouisBoise

STL - BOI

STLBOI

Lambert-St Louis

Wed 11/5

4:45 pm-11:54 pm

1 stop8h 09m

Boise Air Term. Gowen Fld

Mon 11/10

3:00 pm-11:23 pm

1 stop7h 23m

$207

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Tue 10/21

7:59 pm-9:44 am

1 stop15h 45m

Portland

Wed 10/29

11:00 pm-5:01 am

Nonstop4h 01m

$208

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 10/25

7:00 am-9:32 am

Nonstop4h 32m

Portland

Fri 10/31

11:00 pm-5:01 am

Nonstop4h 01m

$209

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Sat 10/25

7:00 am-9:32 am

Nonstop4h 32m

Portland

Fri 10/31

11:00 pm-5:01 am

Nonstop4h 01m

$209

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Sat 10/18

7:10 pm-11:54 pm

1 stop5h 44m

Boise Air Term. Gowen Fld

Sat 10/25

1:39 pm-10:14 pm

1 stop7h 35m

$215

ChicagoBoise

MDW - BOI

MDWBOI

Chicago Midway

Wed 11/12

9:41 am-2:04 pm

1 stop5h 23m

Boise Air Term. Gowen Fld

Sat 11/15

5:35 am-1:07 pm

1 stop6h 32m

$215

ChicagoPortland

ORD - PDX

ORDPDX

Chicago O'Hare Intl

Mon 11/24

7:00 am-9:39 am

Nonstop4h 39m

Portland

Fri 11/28

11:00 pm-5:01 am

Nonstop4h 01m

$222

ChicagoPortland

MDW - PDX

MDWPDX

Chicago Midway

Sat 10/25

3:45 pm-6:05 pm

Nonstop4h 20m

Portland

Fri 10/31

6:00 am-6:05 pm

1 stop10h 05m

$224

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 11/14

2:54 pm-11:49 pm

1 stop9h 55m

Boise Air Term. Gowen Fld

Sun 11/16

11:43 am-9:40 pm

1 stop8h 57m

$228

ChicagoBoise

ORD - BOI

ORDBOI

Chicago O'Hare Intl

Fri 10/24

3:50 pm-11:22 pm

1 stop8h 32m

Boise Air Term. Gowen Fld

Mon 10/27

8:50 pm-6:22 am

1 stop8h 32m

$228

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/12

Showing 1-10 of 60 results
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Best time to book a flight from Illinois to Oregon

Have a flexible travel schedule? Discover the best time to fly to Oregon 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 Oregon

What is the cheapest month to book a flight from Illinois to Oregon?

Currently, November is the cheapest month in which you can book a flight from Illinois to Oregon (average of $277). Flying from Illinois to Oregon in March is currently the most expensive (average of $368). 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 OR?

Find hourly flight availability from Illinois to Oregon. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 15, 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Illinois to Oregon as you normally would.

Weekly flight availability from Illinois to Oregon

Explore weekly flight availability from Illinois to Oregon. 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 September 15, 2025.

The most flights from USIL to USOR are scheduled on a Friday (25 on average). You will have fewer flight options on Thursday, which is when the least amount of flights are scheduled (17 on average).

Reviews of airlines servicing Oregon

Get insights into the airlines that provide service to Oregon. 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 Oregon. Reviews last updated September 15, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest, and Hawaiian Airlines from Illinois to Oregon. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Southwest
8.0
Very good
4,242 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
Hawaiian Airlines
7.8
Good
2,723 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
United Airlines
7.4
Good
8,929 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Crew

8.5

Boarding

8.1

Comfort

7.8

Food

7.1

Entertainment

7.0

Reviews

1 / 20
6.0
Good

Hannah,Aug 2025

SFO - SAN

Ticket said TSA pre check, but then the TSA agent said that Alaska Airlines has not actually entered the pre check information for the ticket, so I had to use regular security. During boarding, I have a disability and need to board early. The Alaska Airlines employee announced disability boarding, but then immediately announced 2 other groups to board, so I still had to fight the crowds. On the plane, the stewardess was brusk and rude. Seats were very uncomfortable, especially on lower back.

Related info for your journey

Find useful and relevant information for your journey from Illinois to Oregon. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • How long is the flight from Illinois to Oregon?

    A quick flight from Illinois to Oregon can take about 4h 32m. Delta provides one of the quickest options available for as low as $209. Illinois and Oregon are separated by a distance of 1733 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines to fly from Illinois to Oregon one-way?

    The cheapest airline one-way is United Airlines, with whom users have recently found tickets for as low as $74. However, be on the lookout for offers from Frontier and Southwest, as they are both options that can get you from Illinois to Oregon for a low price.

  • Can I find deals for flights from Illinois to Oregon that include hotel bookings?

    Yes. In addition to deals on Illinois to Oregon flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Illinois to Oregon?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Illinois to Oregon.

  • Can I find deals for business class flights from Illinois to Oregon?

    Yes. Cheapflights offers flight deals from Illinois to Oregon by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

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

    Currently, November is the cheapest month in which you can book a flight from Illinois to Oregon (average of $277). Flying from Illinois to Oregon in March is currently the most expensive (average of $368). 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 Illinois to Oregon

See prices for flight routes from nearby airports that may be better suited for you.
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Top 8 airlines flying from Illinois to Oregon

Discover the top 8 airlines that operate flights from Illinois to Oregon. 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 September 15, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$86Average$184FlexibilityNo cancel feeOn-time65%
FrontierCheapest$108Average$179FlexibilityNo cancel feeOn-time62%
DeltaCheapest$123Average$428FlexibilityNo cancel feeOn-timeN/A
Hawaiian AirlinesCheapest$134Average$375FlexibilityNo cancel feeOn-time85%
Alaska AirlinesCheapest$183Average$432FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$213Average$432FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$227Average$565FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$238Average$453FlexibilityNo cancel feeOn-time63%

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