Cheap flights from Portland to Illinois from $38
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland to Illinois departing on 7/22. 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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How to get the cheapest flight ticket from Portland 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 Portland is in January. Flight prices, which tend to average around $263, 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 $278.
What is the cheapest day to depart on your flight to Illinois?
The cheapest day to depart from Portland to Illinois is on a Friday when prices can be found for as low as $458. Flights from Portland to Illinois on a Sunday will generally be more expensive and average around $587. 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 Portland to Illinois during this time can be as low as $311. Flights in the morning are often more expensive with an average ticket price of $529.
What is the cheapest Portland to Illinois flight route?
Fly from Portland to Chicago O'Hare Intl for the best Portland - 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 Portland when booking 21 weeks ahead of your departure date. In general, you can expect to find flights to Illinois for around $357 when searching 21 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Illinois from Portland for as low as $304 on momondo.
What cabin class options are available on Portland to Illinois flights?
There are 4 cabin classes available to choose from on Portland to Illinois flights. Cabin price and availability will vary by airline so perform a search above to find the right deals for you.
What is the cheapest airline that flies from Portland to Illinois?
Alaska Airlines, Spirit Airlines, and United Airlines are the most popular carriers operating from Portland to Illinois
What airlines fly to Illinois?
United Airlines, Alaska Airlines and American Airlines are the top three most popular airlines that fly to Illinois from Portland according to our data. United Airlines is the first choice among our users, with 47% 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 Portland to Illinois on average per day?
As of June 2025, there are 31 flights per day flying from Portland to Illinois. The most common time of day flights depart is 7:00AM, with 61% of flights taking off at noon.
How many flights depart from Portland to Illinois on average per week?
The number of flights available between Portland and Illinois is 223 per week as of June 2025. The most frequent departure day is Thu, with 15% of weekly flights leaving on this day.
Cheap Portland to Illinois flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Portland to Illinois
When did momondo last update prices for flights from Portland Airport to Illinois?
Prices for flights from Portland Airport to Illinois are refreshed on a daily basis.
How many operators does momondo search for flights from Portland Airport to Illinois?
As of June 2025, there are 8 operators available to choose from for flights from Portland Airport to Illinois.
How old do you have to be to fly from Portland Airport to Illinois?
The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Portland Airport to Illinois.
What documentation or ID do you need to fly to Illinois?
The travel and health documents required for your trip to Illinois can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Illinois. We always recommend checking with your airline or a trusted third party such as IATA to get advice.
What is the most popular plane model from Portland to Illinois?
Based on momondo bookings for this flight route, the most popular plane model on flight routes from Portland to Illinois is Boeing 737 MAX 9 (14.19% of total bookings). The next most popular plane models are Boeing 737-900 (12.76%), Boeing 737-800 (11.13%), and Airbus A320-100/200 (11.00%).
Best airlines flying from Portland to Illinois
Compare and see reviews for airlines that fly from Portland to Illinois with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $86 | Free Cancellation | Rating 6.3 8,060 reviews | |||
| PriceFrom $108 | Free Cancellation | Rating 5.9 3,296 reviews | |||
| PriceFrom $123 | Free Cancellation | Rating 8.0 7,963 reviews | |||
| PriceFrom $186 | Free Cancellation | Rating 8.0 10,000 reviews | |||
| PriceFrom $202 | Free Cancellation | Rating 7.8 2,501 reviews | |||
| PriceFrom $204 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $216 | Free Cancellation | Rating 7.4 8,801 reviews | |||
| PriceFrom $253 | Free Cancellation | Rating 8.0 4,278 reviews |
Why use momondo?
Why should I use momondo to find a flight deal from Portland to Illinois?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Portland to Illinois. momondo saves you time and could save you money on your trip.
Can I find flights from Portland to Illinois with flexible booking policies on momondo?
Yes. momondo allows you to filter the results for Portland to Illinois flights to just show those with flexible booking policies.
How can momondo help me find flights from Portland to Illinois?
Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Illinois from Portland.
I’m not ready to book a flight from Portland to Illinois right now. Can momondo alert me if prices change?
Yes. momondo can track prices for Portland to Illinois flights and alert you when they change. Perform a search to set up the price alert. All that is required is a valid email address.