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Cheap flights from Oregon to Illinois from $80

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 4/16. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Find the cheapest flights from Oregon to Illinois

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
12:28 pm - 9:18 pm
EUG
-
ORD
6h 50m
1 stop
Delta Logo
6:00 pm - 11:58 pm
ORD
-
EUG
7h 58m
1 stop
$177Delta
Tue, Apr 14 - Tue, Apr 21
Southwest Logo
6:35 am - 4:35 pm
EUG
-
MDW
8h 00m
2 stops
Southwest Logo
6:30 am - 10:45 am
MDW
-
EUG
6h 15m
1 stop
$180Southwest
Tue, Apr 21 - Tue, Apr 28
Frontier Logo
1:22 pm - 11:01 pm
BOI
-
ORD
32h 39m
2 stops
Frontier Logo
9:42 pm - 12:27 pm
ORD
-
BOI
15h 45m
1 stop
$211Frontier
Tue, May 5 - Wed, May 13
Frontier Logo
11:48 am - 7:21 pm
PDX
-
STL
5h 33m
1 stop
Frontier Logo
8:17 pm - 10:20 am
STL
-
PDX
16h 03m
1 stop
$216Frontier
Thu, Apr 16 - Sat, Apr 18
United Airlines Logo
10:56 pm - 5:00 am
PDX
-
ORD
4h 04mnonstop
United Airlines Logo
8:00 pm - 10:35 pm
ORD
-
PDX
4h 35mnonstop
$235United Airlines
Thu, Apr 23 - Thu, Apr 30
American Airlines Logo
1:45 pm - 8:11 pm
PDX
-
ORD
4h 26mnonstop
American Airlines Logo
7:29 am - 9:59 am
ORD
-
PDX
4h 30mnonstop
$236American Airlines
Thu, Jun 4 - Wed, Jun 10
United Airlines Logo
7:45 pm - 5:47 am
PDX
-
STL
8h 02m
1 stop
United Airlines Logo
5:41 pm - 10:30 pm
STL
-
PDX
6h 49m
1 stop
$237United Airlines
Mon, May 18 - Wed, May 27
Alaska Airlines Logo
6:08 pm - 6:40 am
BOI
-
ORD
11h 32m
1 stop
Alaska Airlines Logo
5:52 pm - 11:59 pm
ORD
-
BOI
7h 07m
1 stop
$271Alaska Airlines
Wed, Apr 22 - Wed, Apr 29
Alaska Airlines Logo
4:38 pm - 11:59 pm
BOI
-
STL
6h 21m
1 stop
Alaska Airlines Logo
4:46 pm - 11:02 pm
STL
-
BOI
7h 16m
1 stop
$290Alaska Airlines
Tue, May 5 - Wed, May 6
American Airlines Logo
1:29 pm - 10:19 pm
BOI
-
STL
7h 50m
1 stop
American Airlines Logo
7:05 am - 12:49 pm
STL
-
BOI
6h 44m
1 stop
$317American Airlines
Tue, Apr 21 - Tue, Apr 28

American Airlines flights from Oregon to Illinois

Our best American Airlines deals on Oregon to Illinois flight tickets
American Airlines
Jun 4
PDX1:45 pmPortland
4h 26m
ORD8:11 pmChicago O'Hare Intl
Jun 10
ORD7:29 amChicago O'Hare Intl
4h 30m
PDX9:59 amPortland
$236
American Airlines
May 1
PDX3:16 pmPortland
6h 30m
1 stop
STL11:46 pmLambert-St Louis
May 5
STL5:21 pmLambert-St Louis
8h 36m
1 stop
PDX11:57 pmPortland
$244
American Airlines
Apr 14
PDX11:47 pmPortland
4h 02m
ORD5:49 amChicago O'Hare Intl
Apr 21
ORD8:19 pmChicago O'Hare Intl
4h 37m
PDX10:56 pmPortland
$251

Alaska Airlines flights from Oregon to Illinois

Our best Alaska Airlines deals on Oregon to Illinois flight tickets
Alaska Airlines
Apr 14
EUG5:41 pmEugene
18h 40m
1 stop
ORD2:21 pmChicago O'Hare Intl
Apr 21
ORD4:10 pmChicago O'Hare Intl
8h 20m
1 stop
EUG10:30 pmEugene
$257
Alaska Airlines
May 18
PDX10:37 amPortland
4h 00m
STL4:37 pmLambert-St Louis
May 27
STL5:33 pmLambert-St Louis
4h 17m
PDX7:50 pmPortland
$260
Alaska Airlines
Apr 22
BOI6:08 pmBoise Air Term. Gowen Fld
11h 32m
1 stop
ORD6:40 amChicago O'Hare Intl
Apr 29
ORD5:52 pmChicago O'Hare Intl
7h 07m
1 stop
BOI11:59 pmBoise Air Term. Gowen Fld
$271

momondo Fare Finder

 
Customize your flight search to find flights from Oregon to Illinois 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, momondo users made 832,500 searches. Data last updated March 27, 2026.
Use the filters below to find and compare flights from Oregon to Illinois that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

EugeneChicago

EUG - ORD

EUGORD

Eugene

Tue 4/14

12:28 pm-9:18 pm

1 stop6h 50m

Chicago O'Hare Intl

Tue 4/21

6:00 pm-11:58 pm

1 stop7h 58m

$177

EugeneChicago

EUG - MDW

EUGMDW

Eugene

Tue 4/21

6:35 am-4:35 pm

2 stops8h 00m

Chicago Midway

Tue 4/28

6:30 am-10:45 am

1 stop6h 15m

$180

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Tue 5/5

1:22 pm-11:01 pm

2 stops32h 39m

Chicago O'Hare Intl

Wed 5/13

9:42 pm-12:27 pm

1 stop15h 45m

$211

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/16

11:48 am-7:21 pm

1 stop5h 33m

Lambert-St Louis

Sat 4/18

8:17 pm-10:20 am

1 stop16h 03m

$216
Quickest round-trip

PortlandChicago

PDX - ORD

PDXORD

Portland

Thu 4/23

10:56 pm-5:00 am

Nonstop4h 04m

Chicago O'Hare Intl

Thu 4/30

8:00 pm-10:35 pm

Nonstop4h 35m

$235

PortlandChicago

PDX - ORD

PDXORD

Portland

Thu 6/4

1:45 pm-8:11 pm

Nonstop4h 26m

Chicago O'Hare Intl

Wed 6/10

7:29 am-9:59 am

Nonstop4h 30m

$236

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Mon 5/18

7:45 pm-5:47 am

1 stop8h 02m

Lambert-St Louis

Wed 5/27

5:41 pm-10:30 pm

1 stop6h 49m

$237

BoiseChicago

BOI - ORD

BOIORD

Boise Air Term. Gowen Fld

Wed 4/22

6:08 pm-6:40 am

1 stop11h 32m

Chicago O'Hare Intl

Wed 4/29

5:52 pm-11:59 pm

1 stop7h 07m

$271

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 5/5

4:38 pm-11:59 pm

1 stop6h 21m

Lambert-St Louis

Wed 5/6

4:46 pm-11:02 pm

1 stop7h 16m

$290

BoiseSt. Louis

BOI - STL

BOISTL

Boise Air Term. Gowen Fld

Tue 4/21

1:29 pm-10:19 pm

1 stop7h 50m

Lambert-St Louis

Tue 4/28

7:05 am-12:49 pm

1 stop6h 44m

$317

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first
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See travel insights to Illinois from

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

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 $288.

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

The cheapest day to depart from Oregon to Illinois is on a Wednesday when prices can be found for as low as $422. Flights from Oregon to Illinois on a Monday will generally be more expensive and average around $527. 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 $305. Flights in the morning are often more expensive with an average ticket price of $467.

What is the cheapest Oregon to Illinois flight route?

Fly from Portland to Chicago O'Hare Intl 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 $338 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 $270 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?

You could potentially save up to 1% on your flight if you consider stops on a Oregon to Illinois flight.

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

$168

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 $168. The best round-trip flight deal from Oregon to Illinois found on momondo in the last 72 hours is $328.
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?

  • 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?

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
Spirit AirlinesPriceFrom $93Free CancellationRating
6.3
8,552 reviews
Search Spirit Airlines flights
FrontierPriceFrom $96Free CancellationRating
5.7
3,013 reviews
Search Frontier flights
DeltaPriceFrom $99Free CancellationRating
7.9
8,354 reviews
Search Delta flights
Hawaiian AirlinesPriceFrom $125Free CancellationRating
7.8
2,839 reviews
Search Hawaiian Airlines flights
American AirlinesPriceFrom $179Free CancellationRating
7.1
11,520 reviews
Search American Airlines flights
United AirlinesPriceFrom $206Free CancellationRating
7.4
9,500 reviews
Search United Airlines flights
Alaska AirlinesPriceFrom $208Free CancellationRating
7.9
12,132 reviews
Search Alaska Airlines flights
SouthwestPriceFrom $231Free CancellationRating
8.0
4,335 reviews
Search Southwest 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.

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