What airlines fly to Illinois?

United Airlines, American Airlines and Alaska Airlines are the top three most popular airlines that fly to Illinois from Oregon according to our data. United Airlines is the first choice among our users, with 41% of people opting to fly with this airline when traveling to Illinois. Keep in mind that there are 8 different airlines that fly to Illinois on a routine basis, so you have a few additional options to choose from.

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

The number of flights available between Oregon and Illinois is 19 per day as of February 2026. The most frequent departure time is 7:00AM, with 91% of daily flights leaving at noon.

What is the cheapest airline that flies from Oregon to Illinois?

Delta, Alaska Airlines, and United Airlines are the most popular carriers operating from Oregon to Illinois

How many flights depart from Oregon to Illinois on average per week?

The number of flights available between Oregon and Illinois is 134 per week as of February 2026. The most frequent departure day is Sun, with 19% of weekly flights leaving on this day.

How long is the flight from Oregon to Illinois?

The flight from Oregon to Illinois depends on which airports you’re departing and arriving from and whether or not you have a layover. If you fly from Portland (a popular airport in Oregon) to Chicago O'Hare Intl Airport (the most popular airport in Illinois), then the flight time is 3h 52m on average. If you fly from Eugene (another popular airport in Oregon) to Chicago O'Hare Intl Airport, then the average flight time is 3h 53m.

When did momondo last update prices for flights from Oregon to Illinois?

Prices for flights from Oregon to Illinois are updated daily.

How many operators does momondo search for flights from Oregon to Illinois?

The number of operators available for flights from Oregon to Illinois is 8 as of February 2026.

How old do you have to be to fly from Oregon to Illinois?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Oregon to Illinois.

What documentation or ID do you need to fly to Illinois?

The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$60 Cheap Flights from Oregon to Illinois in 2026

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Find the cheapest flights from Oregon to Illinois

Round-trip

One-way

Last minute

Direct

Cheap round-trip flights

Enter your travel dates to find the best prices.

6:30 am - 9:18 pm

EUG

ORD

12h 48m

2 stops

6:00 pm - 11:10 pm

ORD

EUG

7h 10m

1 stop

$192Delta

Mon, Apr 20 - Wed, Apr 22

3:00 pm - 11:25 pm

BOI

STL

7h 25m

1 stop

5:00 pm - 10:11 pm

STL

BOI

6h 11m

1 stop

$197Delta

Wed, Mar 25 - Sat, Mar 28

2:00 pm - 11:59 pm

MFR

ORD

7h 59m

1 stop

7:00 am - 1:02 pm

ORD

MFR

8h 02m

1 stop

$197Alaska Airlines

Tue, Mar 10 - Wed, Mar 11

5:40 am - 1:11 pm

BOI

ORD

6h 31m

1 stop

7:00 am - 3:08 pm

ORD

BOI

9h 08m

1 stop

$213Alaska Airlines

Sat, Mar 7 - Tue, Mar 10

11:59 pm - 5:53 am

PDX

ORD

3h 54mnonstop

9:06 am - 11:51 am

ORD

PDX

4h 45mnonstop

$217United Airlines

Fri, Mar 6 - Mon, Mar 9

7:15 pm - 5:00 am

PDX

MDW

7h 45m

1 stop

8:10 pm - 1:40 am

MDW

PDX

7h 30m

1 stop

$218Southwest

Thu, Mar 5 - Sat, Mar 7

6:55 am - 2:30 pm

PDX

MDW

5h 35m

1 stop

8:10 pm - 1:40 am

MDW

PDX

7h 30m

1 stop

$220Southwest

Sat, Feb 28 - Sat, Mar 7

11:59 pm - 5:56 am

PDX

ORD

3h 57mnonstop

9:44 pm - 12:15 am

ORD

PDX

4h 31mnonstop

$225American Airlines

Sat, Mar 14 - Sun, Mar 15

1:39 pm - 12:59 am

PDX

ORD

9h 20m

1 stop

9:06 am - 11:51 am

ORD

PDX

4h 45mnonstop

$227United Airlines

Fri, Mar 6 - Mon, Mar 9

1:29 pm - 6:16 pm

BOI

ORD

3h 47mnonstop

9:54 am - 12:49 pm

ORD

BOI

3h 55mnonstop

$262American Airlines

Sat, May 2 - Tue, May 5

American Airlines flights from Oregon to Illinois

Our best American Airlines deals on Oregon to Illinois flight tickets

American Airlines

May 16

PDX6:22 amPortland

4h 10m

ORD12:32 pmChicago O'Hare Intl

May 19

ORD9:20 pmChicago O'Hare Intl

4h 31m

PDX11:51 pmPortland

$214

American Airlines

Mar 14

PDX11:59 pmPortland

3h 57m

ORD5:56 amChicago O'Hare Intl

Mar 15

ORD9:44 pmChicago O'Hare Intl

4h 31m

PDX12:15 amPortland

$225

American Airlines

May 27

PDX6:00 amPortland

4h 06m

ORD12:06 pmChicago O'Hare Intl

May 30

ORD9:20 pmChicago O'Hare Intl

4h 27m

PDX11:47 pmPortland

$239

Alaska Airlines flights from Oregon to Illinois

Our best Alaska Airlines deals on Oregon to Illinois flight tickets

Alaska Airlines

Mar 10

MFR2:00 pmMedford

7h 59m

1 stop

ORD11:59 pmChicago O'Hare Intl

Mar 11

ORD7:00 amChicago O'Hare Intl

8h 02m

1 stop

MFR1:02 pmMedford

$197

Alaska Airlines

Mar 7

BOI5:40 amBoise Air Term. Gowen Fld

6h 31m

1 stop

ORD1:11 pmChicago O'Hare Intl

Mar 10

ORD7:00 amChicago O'Hare Intl

9h 08m

1 stop

BOI3:08 pmBoise Air Term. Gowen Fld

$213

Alaska Airlines

Mar 6

BOI6:00 pmBoise Air Term. Gowen Fld

19h 11m

1 stop

ORD2:11 pmChicago O'Hare Intl

Mar 9

ORD3:54 pmChicago O'Hare Intl

7h 46m

1 stop

BOI10:40 pmBoise Air Term. Gowen Fld

$229

Fly from

Fly to

Route

Depart

Return

Price

EugeneChicago

EUG - ORD

EUGORD

Eugene

Mon 4/20

6:30 am-9:18 pm

2 stops12h 48m

Chicago O'Hare Intl

Wed 4/22

6:00 pm-11:10 pm

1 stop7h 10m

$192

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Wed 3/25

3:00 pm-11:25 pm

1 stop7h 25m

Lambert-St Louis

Sat 3/28

5:00 pm-10:11 pm

1 stop6h 11m

$197

MedfordChicago

MFR - ORD

MFRORD

Medford

Tue 3/10

2:00 pm-11:59 pm

1 stop7h 59m

Chicago O'Hare Intl

Wed 3/11

7:00 am-1:02 pm

1 stop8h 02m

$197

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 3/7

5:40 am-1:11 pm

1 stop6h 31m

Chicago O'Hare Intl

Tue 3/10

7:00 am-3:08 pm

1 stop9h 08m

$213

PortlandChicago

PDX - ORD

PDXORD

Portland

Fri 3/6

11:59 pm-5:53 am

Nonstop3h 54m

Chicago O'Hare Intl

Mon 3/9

9:06 am-11:51 am

Nonstop4h 45m

$217

PortlandChicago

PDX - MDW

PDXMDW

Portland

Thu 3/5

7:15 pm-5:00 am

1 stop7h 45m

Chicago Midway

Sat 3/7

8:10 pm-1:40 am

1 stop7h 30m

$218

PortlandChicago

PDX - MDW

PDXMDW

Portland

Sat 2/28

6:55 am-2:30 pm

1 stop5h 35m

Chicago Midway

Sat 3/7

8:10 pm-1:40 am

1 stop7h 30m

$220

PortlandChicago

PDX - ORD

PDXORD

Portland

Sat 3/14

11:59 pm-5:56 am

Nonstop3h 57m

Chicago O'Hare Intl

Sun 3/15

9:44 pm-12:15 am

Nonstop4h 31m

$225

PortlandChicago

PDX - ORD

PDXORD

Portland

Fri 3/6

1:39 pm-12:59 am

1 stop9h 20m

Chicago O'Hare Intl

Mon 3/9

9:06 am-11:51 am

Nonstop4h 45m

$227

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Sat 5/2

1:29 pm-6:16 pm

Nonstop3h 47m

Chicago O'Hare Intl

Tue 5/5

9:54 am-12:49 pm

Nonstop3h 55m

$262

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Oregon to Illinois

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

Other information

What is the cheapest month to fly to Illinois?

The cheapest month to fly to Illinois from Oregon is in January. Flight prices, which tend to average around $237, are often lower during this time because this is during the off-season. If you aren’t able to travel to Illinois during the month of January, then flying in August is also cheap. Prices for this month can be found on momondo for an average of $289.

What is the cheapest day to depart on your flight to Illinois?

The cheapest day to depart from Oregon to Illinois is on a Friday when prices can be found for as low as $427. Flights from Oregon to Illinois on a Monday will generally be more expensive and average around $532. Keep in mind that these prices on both days could fluctuate depending on the season and the demand.

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Oregon to Illinois during this time can be as low as $314. Flights in the morning are often more expensive with an average ticket price of $478.

What is the cheapest Oregon to Illinois flight route?

Fly from Portland to Chicago Midway for the best Oregon - Illinois flight prices

How far in advance should I book a flight to Illinois?

You are more likely to see cheaper flights to Illinois from Oregon when booking weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $348 when searching weeks out. However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Oregon for as low as $295 on momondo.

What cabin class options are available on Oregon to Illinois flights?

There are 4 cabin classes available to choose from on Oregon to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Oregon to Illinois flights?

No. A direct flight is the cheapest option for a flight between Oregon to Illinois.

Cheap Oregon to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Oregon to Illinois

Best Price Found	$166
Fastest flight time	3h 20m
Direct flights	Every day
Airports in Illinois	98 airports

The best one-way flight to Illinois from Oregon in the past 72 hours is $166. The best round-trip flight deal from Oregon to Illinois found on momondo in the last 72 hours is $318.

The fastest flight from Oregon to Illinois takes 3h 20m

Direct flights go from Oregon to Illinois every day.

There are 98 airports in Illinois. From Oregon there are direct flights to Chicago O'Hare Intl (ORD), Chicago Midway (MDW), Lambert-St Louis (STL).

Search flight deals

When did momondo last update prices for flights from Oregon to Illinois?
Prices for flights from Oregon to Illinois are updated daily.
How many operators does momondo search for flights from Oregon to Illinois?
The number of operators available for flights from Oregon to Illinois is 8 as of February 2026.
How old do you have to be to fly from Oregon to Illinois?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Oregon to Illinois.
What documentation or ID do you need to fly to Illinois?
The necessary travel and health documents for your Illinois trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular plane model from Oregon to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Oregon to Illinois is Boeing 737-800 (30.35% of total bookings). The next most popular plane models are Boeing 737 MAX 9 (15.37%), Boeing 737-900 (12.74%), and Boeing 737 MAX 8 (12.41%).

Best airlines flying from Oregon to Illinois

Compare and see reviews for airlines that fly from Oregon to Illinois with momondo

Airline	Rating	Free Cancellation	Price
Frontier	PriceFrom $86	Free Cancellation	Rating 5.7 3,051 reviews	Search Frontier flights
Delta	PriceFrom $99	Free Cancellation	Rating 7.9 8,174 reviews	Search Delta flights
Spirit Airlines	PriceFrom $119	Free Cancellation	Rating 6.3 8,430 reviews	Search Spirit Airlines flights
Hawaiian Airlines	PriceFrom $125	Free Cancellation	Rating 7.8 2,830 reviews	Search Hawaiian Airlines flights
Southwest	PriceFrom $179	Free Cancellation	Rating 8.0 4,282 reviews	Search Southwest flights
United Airlines	PriceFrom $184	Free Cancellation	Rating 7.4 9,259 reviews	Search United Airlines flights
American Airlines	PriceFrom $196	Free Cancellation	Rating 7.2 11,257 reviews	Search American Airlines flights
Alaska Airlines	PriceFrom $215	Free Cancellation	Rating 8.0 11,863 reviews	Search Alaska Airlines flights

Why use momondo?

Why should I use momondo to find a flight deal from Oregon to Illinois?

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Oregon to Illinois. momondo saves you time and could save you money on your trip.

Can I find flights from Oregon to Illinois with flexible booking policies on momondo?

Flights from Oregon to Illinois with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Oregon to Illinois?

Once you have performed a search for Oregon to Illinois flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Oregon to Illinois right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Illinois from Oregon. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Illinois trip

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Popular cities in Illinois

Flights to New Yorkfrom $49

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Flights to Orlandofrom $27

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Flights to Las Vegasfrom $28

Flights to Washington, D.C.from $51

Flights to Bostonfrom $50

Flights to Atlantafrom $49

Flights to Dallasfrom $50

Flights to Seattlefrom $65

Cheap flights from Oregon to Illinois from $60

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Oregon to Illinois departing on 3/6. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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American Airlines flights from Oregon to Illinois

Our best American Airlines deals on Oregon to Illinois flight tickets

Alaska Airlines flights from Oregon to Illinois

Our best Alaska Airlines deals on Oregon to Illinois flight tickets

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Use the filters below to find and compare flights from Oregon to Illinois that are best for you.

See travel insights to Illinois from

How to get the cheapest flight ticket from Oregon to Illinois

What is the cheapest month to fly to Illinois?

What is the cheapest day to depart on your flight to Illinois?

What is the cheapest time of day to depart on your flight to Illinois?

Our most recent data shows that the best time of day to fly to Illinois is in the afternoon. Flights from Oregon to Illinois during this time can be as low as $314. Flights in the morning are often more expensive with an average ticket price of $478.

What is the cheapest Oregon to Illinois flight route?

Fly from Portland to Chicago Midway for the best Oregon - Illinois flight prices

How far in advance should I book a flight to Illinois?

What cabin class options are available on Oregon to Illinois flights?

There are 4 cabin classes available to choose from on Oregon to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.

Can stopping save me money on Oregon to Illinois flights?

No. A direct flight is the cheapest option for a flight between Oregon to Illinois.

What is the cheapest airline that flies from Oregon to Illinois?

Delta, Alaska Airlines, and United Airlines are the most popular carriers operating from Oregon to Illinois

What airlines fly to Illinois?

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

The number of flights available between Oregon and Illinois is 19 per day as of February 2026. The most frequent departure time is 7:00AM, with 91% of daily flights leaving at noon.

How many flights depart from Oregon to Illinois on average per week?

The number of flights available between Oregon and Illinois is 134 per week as of February 2026. The most frequent departure day is Sun, with 19% of weekly flights leaving on this day.

How long is the flight from Oregon to Illinois?

Cheap Oregon to Illinois flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Oregon to Illinois

Best Price Found

Fastest flight time

Direct flights

Airports in Illinois

When did momondo last update prices for flights from Oregon to Illinois?

How many operators does momondo search for flights from Oregon to Illinois?

How old do you have to be to fly from Oregon to Illinois?

What documentation or ID do you need to fly to Illinois?

What is the most popular plane model from Oregon to Illinois?

Best airlines flying from Oregon to Illinois

Compare and see reviews for airlines that fly from Oregon to Illinois with momondo

Why use momondo?

Why should I use momondo to find a flight deal from Oregon to Illinois?

Can I find flights from Oregon to Illinois with flexible booking policies on momondo?

How can momondo help me find flights from Oregon to Illinois?

I’m not ready to book a flight from Oregon to Illinois right now. Can momondo alert me if prices change?

An easier way to manage your Illinois trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to Illinois

Popular cities in Illinois

Popular flights according to clicks in the last 7 days on momondo

Oregon flight routes

According to popular flight searches on momondo this year

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