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

To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $83. Frontier flights start at $85 while deals on Alaska Airlines start at $99 one-way.

What are the most popular routes from Portland to Illinois?

When deciding which route to take from Portland to Illinois consider Portland - Chicago O'Hare Intl, Portland - Chicago Midway or Portland - Lambert-St Louis as they are the most popular.

What are the cheapest flights from Portland to Illinois?

On average you can expect to pay $982 for a flight from Portland to Illinois. The cheapest flight overall is $133 while the most popular route, (Portland - Chicago O'Hare Intl) is currently priced at $125.

What are the most reliable airlines from Portland to Illinois?

Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portland to Illinois on time: Brussels Airlines (97%), SWISS (97%), Lufthansa (96%).

What are the most popular airlines that fly from Portland to Illinois?

Before booking your flight from Portland to Illinois check out the most popular airlines for this route: American Airlines, Alaska Airlines or Delta.

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

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 49 days in advance, which can save you up to 26% on flights from Portland to Illinois compared to booking the week you need them. Waiting 49 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $298. For sooner than that we have options available in the next 3 days from $367.

What is the cheapest month to fly from Portland to Illinois?

Our data shows that January tends to be the cheapest month to fly to Illinois from Portland. Users have commonly found prices around $344 for the month, but tickets can be as low as $178. Due to multiple factors, prepare for potentially higher prices in March.

What airport do you fly from for flights from Portland to Illinois?

Located just 6.0 mi from the city center, Portland (PDX) is the airport most travelers will use when flying to Illinois from Portland.

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

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

How can I find direct flights from Portland to Illinois?

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

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

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

$83+ Flights from Portland to Illinois

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Cheap flight deals from Portland to Illinois

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Round-trip from	$160 (CheapOair)
One-way from	$83 (Mytrip)
Popular in	March
Cheapest in	January
Average price	$431
Good round-trip deal	$399 or less
Good one-way deal	$210 or less

Provider with most accurate pricing for Portland-Chicago (CHI) flight deals.

Search Deals

Provider most trusted by Cheapflights users for Portland-Chicago (CHI) flights.

Search Deals

From Portland to Illinois

Search Deals

One-way flight from Portland to Illinois

Search Deals

Highest demand for flights based on searches. 8% potential increase in price ($30 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in March 2025

Search Deals

Price to beat on a round-trip flight from Portland to Illinois.

Search Deals

Price to beat on a one-way flight from Portland to Illinois.

Search Deals

Find flight deals from Portland to Illinois

Cheapest flights from Portland to Illinois
Explore the most affordable flight options available from Portland to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 8, 2025.

Thu 4/39:21 pmPDX - STL

1 stop18h 22mFrontier

Mon 4/76:51 pmSTL - PDX

1 stop7h 46mFrontier

Deal found 3/7

$170

Wed 4/23:02 pmPDX - STL

1 stop6h 57mAlaska Airlines

Tue 4/86:44 amSTL - PDX

1 stop6h 08mAlaska Airlines

Deal found 3/7

$199

Thu 4/175:26 pmPDX - STL

1 stop5h 16mDelta

Mon 4/217:15 pmSTL - PDX

1 stop6h 29mDelta

Deal found 3/7

$227

Mon 4/711:52 pmPDX - ORD

Nonstop4h 05mAmerican Airlines

Tue 4/158:20 pmORD - PDX

Nonstop4h 42mAmerican Airlines

Deal found 3/5

$238

Fri 4/49:01 amPDX - ORD

1 stop13h 57mMultiple Airlines

Wed 4/93:16 pmORD - PDX

Nonstop4h 34mMultiple Airlines

Deal found 3/6

$239

Mon 5/51:15 pmPDX - ORD

1 stop13h 55mFrontier

Fri 5/165:21 pmORD - PDX

1 stop9h 17mFrontier

Deal found 3/7

$240

Mon 5/56:20 amPDX - MDW

1 stop10h 48mFrontier

Fri 5/96:15 amMDW - PDX

1 stop11h 27mFrontier

Deal found 3/6

$240

Thu 3/276:50 pmPDX - ORD

1 stop9h 52mSpirit Airlines

Mon 3/318:09 amORD - PDX

1 stop11h 46mSpirit Airlines

Deal found 3/6

$241

Sat 4/57:00 amPDX - ORD

Nonstop4h 05mAlaska Airlines

Tue 4/82:05 pmORD - PDX

1 stop8h 46mAlaska Airlines

Deal found 3/5

$242

Tue 4/112:59 amPDX - MDW

1 stop15h 19mDelta

Mon 4/143:02 pmMDW - PDX

1 stop9h 07mDelta

Deal found 3/7

$245

Thu 5/221:45 pmPDX - STL

1 stop21h 55mMultiple Airlines

Sun 5/2510:20 amSTL - PDX

1 stop9h 11mMultiple Airlines

Deal found 3/6

$245

Fri 10/108:45 pmPDX - ORD

1 stop6h 19mHawaiian Airlines

Tue 10/147:00 amORD - PDX

Nonstop4h 34mHawaiian Airlines

Deal found 3/7

$248

Best flights from Portland to Illinois
Discover carefully curated flight deals from Portland to Illinois that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated March 8, 2025.

Tue 4/19:59 amPDX - STL

1 stop21h 07mFrontier

Thu 4/31:46 pmSTL - PDX

1 stop21h 01mFrontier

Deal found 3/6

$160

Wed 4/23:02 pmPDX - STL

1 stop6h 57mHawaiian Airlines

Tue 4/86:44 amSTL - PDX

1 stop6h 08mHawaiian Airlines

Deal found 3/6

$198

Wed 4/23:02 pmPDX - STL

1 stop6h 57mAlaska Airlines

Tue 4/86:44 amSTL - PDX

1 stop6h 08mAlaska Airlines

Deal found 3/7

$199

Wed 4/305:05 amPDX - STL

1 stop6h 37mAmerican Airlines

Mon 5/51:59 pmSTL - PDX

1 stop8h 37mAmerican Airlines

Deal found 3/6

$213

Thu 4/175:26 pmPDX - STL

1 stop5h 16mDelta

Mon 4/217:15 pmSTL - PDX

1 stop6h 29mDelta

Deal found 3/7

$227

Fri 4/46:50 pmPDX - ORD

2 stops32h 56mSpirit Airlines

Mon 4/710:27 pmORD - PDX

3 stops20h 51mSpirit Airlines

Deal found 3/7

$239

Thu 4/102:25 pmPDX - ORD

1 stop7h 50mUnited Airlines

Sat 4/129:17 amORD - PDX

Nonstop4h 35mUnited Airlines

Deal found 3/7

$244

Thu 5/221:45 pmPDX - STL

1 stop21h 55mMultiple Airlines

Sun 5/2510:20 amSTL - PDX

1 stop9h 11mMultiple Airlines

Deal found 3/6

$245

Tue 5/66:35 pmPDX - MDW

1 stop8h 45mSouthwest

Fri 5/94:15 pmMDW - PDX

Nonstop4h 20mSouthwest

Deal found 3/6

$248

Thu 6/2611:59 pmPDX - ORD

1 stop17h 12mSun Country Air

Fri 7/48:05 pmORD - PDX

1 stop28h 41mSun Country Air

Deal found 3/7

$340

Mon 5/51:15 pmPDX - ORD

1 stop13h 55mFrontier

Fri 5/165:21 pmORD - PDX

1 stop9h 17mFrontier

Deal found 3/7

$240

Fri 5/308:08 amPDX - RFD

2 stops21h 58mAllegiant Air

Sun 6/14:16 pmRFD - PDX

2 stops17h 02mAllegiant Air

Deal found 3/6

$483

Last-minute flights from Portland to Illinois
Discover last-minute flight deals from Portland to Illinois. Data last updated March 8, 2025 and is based on user searches.

Wed 3/1210:06 amPDX - MDW

1 stop12h 11mFrontier

Sun 3/166:40 amMDW - PDX

1 stop19h 57mFrontier

Deal found 3/7

$244

Wed 3/1210:06 amPDX - ORD

1 stop12h 38mFrontier

Sun 3/166:45 amORD - PDX

1 stop19h 52mFrontier

Deal found 3/7

$245

Thu 3/136:32 amPDX - STL

1 stop24h 44mFrontier

Thu 3/206:38 pmSTL - PDX

1 stop16h 02mFrontier

Deal found 3/6

$207

Thu 3/137:32 pmPDX - ORD

1 stop9h 10mMultiple Airlines

Sun 3/167:59 pmORD - PDX

1 stop14h 41mMultiple Airlines

Deal found 3/6

$251

Thu 3/1312:59 amPDX - STL

1 stop7h 30mDelta

Fri 3/217:40 amSTL - PDX

1 stop6h 43mDelta

Deal found 3/7

$456

Thu 3/131:33 pmPDX - STL

1 stop8h 26mAlaska Airlines

Thu 3/206:44 amSTL - PDX

2 stops19h 15mAlaska Airlines

Deal found 3/6

$463

Thu 3/137:32 pmPDX - STL

3 stops22h 38mMultiple Airlines

Thu 3/209:50 amSTL - PDX

3 stops30h 19mMultiple Airlines

Deal found 3/6

$493

Thu 3/1311:38 pmPDX - STL

2 stops10h 34mUnited Airlines

Thu 3/208:20 amSTL - PDX

2 stops12h 15mUnited Airlines

Deal found 3/6

$531

Fri 3/145:21 amPDX - ORD

1 stop6h 53mAmerican Airlines

Fri 3/144:40 pmORD - PDX

1 stop8h 20mAmerican Airlines

Deal found 3/7

$458

Sat 3/158:50 amPDX - ORD

1 stop14h 07mFrontier

Tue 3/186:45 amORD - PDX

1 stop19h 52mFrontier

Deal found 3/8

$244

Sat 3/157:32 pmPDX - ORD

1 stop9h 10mSpirit Airlines

Tue 3/1810:44 amORD - PDX

2 stops25h 36mSpirit Airlines

Deal found 3/7

$328

Mon 3/177:00 amPDX - ORD

Nonstop4h 04mAlaska Airlines

Thu 3/203:16 pmORD - PDX

Nonstop4h 34mAlaska Airlines

Deal found 3/7

$512

One-way flights from Portland to Illinois
Search for one-way flight options from Portland to Illinois. Find affordable one-way fares based on user searches. Data last updated March 8, 2025.

Sun 4/66:50 pmPDX - ORD

2 stops32h 56mSpirit Airlines

Deal found 3/7

$83

Mon 4/286:41 pmPDX - ORD

1 stop8h 33mFrontier

Deal found 3/7

$85

Mon 4/79:01 amPDX - MDW

1 stop9h 13mFrontier

Deal found 3/6

$85

Thu 5/86:20 amPDX - STL

1 stop6h 47mFrontier

Deal found 3/6

$85

Sat 4/196:00 amPDX - STL

1 stop6h 15mAlaska Airlines

Deal found 3/6

$99

Tue 4/81:29 pmPDX - STL

1 stop5h 35mDelta

Deal found 3/7

$100

Tue 4/111:15 amPDX - MDW

1 stop16h 08mMultiple Airlines

Deal found 3/6

$104

Wed 5/285:51 pmPDX - ORD

Nonstop4h 05mHawaiian Airlines

Deal found 3/7

$114

Tue 4/226:20 amPDX - ORD

1 stop13h 11mDelta

Deal found 3/7

$116

Tue 4/111:59 pmPDX - ORD

Nonstop3h 57mUnited Airlines

Deal found 3/7

$119

Fri 4/1112:59 amPDX - MDW

1 stop7h 43mDelta

Deal found 3/7

$124

Mon 4/2111:52 pmPDX - ORD

Nonstop4h 05mAmerican Airlines

Deal found 3/7

$125

Find flights from Portland to Illinois within your budget

Fly from

Fly to

Route

Depart

Return

Price

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/3

9:21 pm-5:43 pm

1 stop18h 22m

Lambert-St Louis

Mon 4/7

6:51 pm-12:37 am

1 stop7h 46m

$170

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Wed 4/2

3:02 pm-11:59 pm

1 stop6h 57m

Lambert-St Louis

Tue 4/8

6:44 am-10:52 am

1 stop6h 08m

$199

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 4/17

5:26 pm-12:42 am

1 stop5h 16m

Lambert-St Louis

Mon 4/21

7:15 pm-11:44 pm

1 stop6h 29m

$227

PortlandChicago

PDX - ORD

PDXORD

Portland

Fri 4/4

6:50 pm-5:46 am

2 stops32h 56m

Chicago O'Hare Intl

Mon 4/7

10:27 pm-5:18 pm

3 stops20h 51m

$239

PortlandChicago

PDX - ORD

PDXORD

Portland

Mon 5/5

1:15 pm-5:10 am

1 stop13h 55m

Chicago O'Hare Intl

Fri 5/16

5:21 pm-12:38 am

1 stop9h 17m

$240

PortlandChicago

PDX - MDW

PDXMDW

Portland

Mon 5/5

6:20 am-7:08 pm

1 stop10h 48m

Chicago Midway

Fri 5/9

6:15 am-3:42 pm

1 stop11h 27m

$240

PortlandChicago

PDX - ORD

PDXORD

Portland

Tue 5/6

9:35 am-6:01 pm

1 stop6h 26m

Chicago O'Hare Intl

Sat 5/10

2:07 pm-4:40 pm

Nonstop4h 33m

$242

PortlandChicago

PDX - ORD

PDXORD

Portland

Thu 4/10

2:25 pm-12:15 am

1 stop7h 50m

Chicago O'Hare Intl

Sat 4/12

9:17 am-11:52 am

Nonstop4h 35m

$244

PortlandSt. Louis

PDX - STL

PDXSTL

Portland

Thu 5/22

1:45 pm-1:40 pm

1 stop21h 55m

Lambert-St Louis

Sun 5/25

10:20 am-5:31 pm

1 stop9h 11m

$245

PortlandChicago

PDX - ORD

PDXORD

Portland

Tue 4/1

12:59 am-9:47 pm

1 stop18h 48m

Chicago O'Hare Intl

Mon 4/14

5:05 pm-10:09 pm

1 stop7h 04m

$245

Flights are sorted by cheapest round-trip flights first.

Deals found on 3/7

Showing 1-10 of 60 results

...

Best time to book a flight from Portland to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Portland 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.

Travel insights for flights from Portland to Illinois

Get recent, data-driven insights about flights from Portland to Illinois including ideal travel times, pricing trends, and more.

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

Currently, August is the cheapest month in which you can book a flight from Portland to Illinois (average of $245). Flying from Portland to Illinois in March is currently the most expensive (average of $326). 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 PDX to IL?

When flying from Portland to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Rainfall in Illinois by month

In terms of precipitation, rainfall in Illinois ranges from 1.7 - 4.9 inches per month. August is typically the wettest month, when rainfall can reach 4.9 in. January is typically the driest time to visit Illinois when rainfall is around 1.7 in.

Temperature in Illinois by month

If weather is an important factor for your trip to Illinois, 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 73.4 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 23.0 F).

Reviews of airlines servicing Illinois

Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Portland to Illinois. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Southwest

8.1

Very good

4,314 reviews

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Alaska Airlines

8.0

Very good

9,714 reviews

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Delta

8.0

Very good

8,024 reviews

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Hawaiian Airlines

7.9

Good

2,318 reviews

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

United Airlines

7.4

Good

8,649 reviews

Southwest

8.1

Very good

4,314 reviews

Reviews

1 / 20

8.0

Excellent

Ila,Mar 2025

HOU - DAL

Our original flight was delayed. We were able to change our flight and got home at close to the same time. Looking forward to when you have assigned seating.

Related info for your journey

What airport do you fly from for flights from Portland to Illinois?
Located just 6.0 mi from the city center, Portland (PDX) is the airport most travelers will use when flying to Illinois from Portland.
What are the cheapest airlines to fly from Portland to Illinois one-way?
To fly one-way, consider booking your trip with Spirit Airlines, which is currently one of the cheapest options available, starting at $83. Frontier flights start at $85 while deals on Alaska Airlines start at $99 one-way.
What are the most popular routes from Portland to Illinois?
When deciding which route to take from Portland to Illinois consider Portland - Chicago O'Hare Intl, Portland - Chicago Midway or Portland - Lambert-St Louis as they are the most popular.
What are the most reliable airlines from Portland to Illinois?
Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from Portland to Illinois on time: Brussels Airlines (97%), SWISS (97%), Lufthansa (96%).
What are the cheapest flights from Portland to Illinois?
On average you can expect to pay $982 for a flight from Portland to Illinois. The cheapest flight overall is $133 while the most popular route, (Portland - Chicago O'Hare Intl) is currently priced at $125.
Can I find deals for flights from Portland to Illinois that include hotel bookings?
Yes. In addition to deals on Portland to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Portland to Illinois?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portland to Illinois.
Can I find deals for business class flights from Portland to Illinois?
Yes. Cheapflights offers flight deals from Portland to Illinois 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 Portland to Illinois?
Currently, August is the cheapest month in which you can book a flight from Portland to Illinois (average of $245). Flying from Portland to Illinois in March is currently the most expensive (average of $326). 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

Browse thousands of different options on Cheapflights for your next trip

Top 7 airlines flying from Portland to Illinois

Airline	Cheapest	Average	Flexibility	On-time
Spirit Airlines	Cheapest$82	Average$135	FlexibilityNo cancel fee	On-time65%
Frontier	Cheapest$108	Average$242	FlexibilityNo cancel fee	On-time62%
Alaska Airlines	Cheapest$180	Average$340	FlexibilityNo cancel fee	On-time75%
American Airlines	Cheapest$189	Average$502	FlexibilityNo cancel fee	On-time71%
Delta	Cheapest$207	Average$378	FlexibilityNo cancel fee	On-timeN/A
United Airlines	Cheapest$218	Average$466	FlexibilityNo cancel fee	On-time69%
Southwest	Cheapest$249	Average$411	FlexibilityNo cancel fee	On-time63%

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$83+ Cheap flights from Portland (PDX) to Illinois

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 4/6. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Portland to Illinois with Cheapflights

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Cheap flight deals from Portland to Illinois

Keep the following information in mind while searching for Portland to Illinois flight deals. Data was last updated March 8, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Portland to Illinois

Cheapest flights from Portland to IllinoisExplore the most affordable flight options available from Portland to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 8, 2025.

Explore the most affordable flight options available from Portland to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 8, 2025.

Find flights from Portland to Illinois within your budget

Best time to book a flight from Portland to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Portland with our price prediction graph.

Travel insights for flights from Portland to Illinois

Get recent, data-driven insights about flights from Portland to Illinois including ideal travel times, pricing trends, and more.

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

What is the cheapest time of day to fly from PDX to IL?

Find hourly flight availability from Portland to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated March 8, 2025.

Rainfall in Illinois by month

Plan your trip to Illinois by taking into account the average rainfall totals by month.

Temperature in Illinois by month

Plan your trip to Illinois by taking into account the average temperature totals by month.

Reviews of airlines servicing Illinois

Read reviews from past customers who have flown Southwest, Alaska Airlines and Delta from Portland to Illinois. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What airport do you fly from for flights from Portland to Illinois?

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

What are the most popular routes from Portland to Illinois?

What are the most reliable airlines from Portland to Illinois?

What are the cheapest flights from Portland to Illinois?

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

How can I find direct flights from Portland to Illinois?

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

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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Portland to Illinois

See prices for flight routes from nearby airports that may be better suited for you.

Top 7 airlines flying from Portland to Illinois

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Cheapest flights from Portland to Illinois
Explore the most affordable flight options available from Portland to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on March 8, 2025.