Cheap flights from Chicago O'Hare Intl Airport to Porto from $267
This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Chicago O'Hare Intl Airport to Porto departing on 8/18. 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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Scandinavian Airlines flights from Chicago O'Hare Intl Airport to Porto
Our best Scandinavian Airlines deals on Chicago O'Hare Intl Airport to Porto flight tickets
TAP AIR PORTUGAL flights from Chicago O'Hare Intl Airport to Porto
Our best TAP AIR PORTUGAL deals on Chicago O'Hare Intl Airport to Porto flight tickets
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How to get the cheapest flight ticket from Chicago O'Hare Intl Airport to Porto
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 Porto?
The month of February is, on average, the cheapest month to fly to Porto from Chicago O'Hare Intl Airport, with most prices found around $492. If you aren’t able to travel during the month of February, then book flights to Porto from Chicago O'Hare Intl Airport during November instead. Flights to Porto in November, while not as cheap as those in February, still average around $551.
What is the cheapest day to depart on your flight to Porto?
The cheapest day to depart on your flight to Porto is on a Monday when prices can be found for as low as $708. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Saturday because tickets tend to average around $808. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.
What is the cheapest time of day to depart on your flight to Porto?
In the evening is the cheapest time of day to fly from Chicago O'Hare Intl Airport to Porto when you can find flight prices for as low as $611. Flying to Porto in the evening is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,018 on average. Flights to Porto from Chicago O'Hare Intl Airport at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.
How far in advance should I book a flight to Porto?
You are more likely to see cheaper flights to Porto from Chicago O'Hare Intl Airport when booking 15 weeks ahead of your departure date. In general, you can expect to find flights to Porto for around $686 when searching 15 weeks out.However, flight prices might be lower outside of this timeframe. For example, people recently found flights to Porto from Chicago O'Hare Intl Airport for as low as $606 on momondo.
What is the cheapest airline that flies from Chicago O'Hare Intl to Porto?
TAP AIR PORTUGAL, Scandinavian Airlines, and SWISS are the most popular carriers operating from Chicago O'Hare Intl to Porto
What airlines fly to Porto?
United Airlines, TAP AIR PORTUGAL and Iberia are the top three most popular airlines that fly to Porto from Chicago O'Hare Intl Airport according to our data. United Airlines is the first choice among our users, with 36% of people opting to fly with this airline when traveling to Porto. Keep in mind that there are 10 different airlines that fly to Porto on a routine basis, so you have a few additional options to choose from.
When to book flights from Chicago O'Hare Intl Airport to Porto
Cheap Chicago O'Hare Intl Airport to Porto (ORD to OPO) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Chicago O'Hare Intl Airport to Porto
How far is Chicago O'Hare Intl to Porto by plane?
Porto is 3936.9 mi away from Chicago O'Hare Intl. A reasonable flight in good conditions will take 9h 59m.
When did momondo last update prices for flights from Chicago O'Hare Intl Airport to Porto Airport?
Prices for flights from Chicago O'Hare Intl Airport to Porto Airport refresh daily.
How many operators does momondo search for flights from Chicago O'Hare Intl Airport to Porto Airport?
As of June 2025, there are 10 operators available to choose from for flights from Chicago O'Hare Intl Airport to Porto Airport.
How old do you have to be to fly from Chicago O'Hare Intl Airport to Porto Airport?
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 Chicago O'Hare Intl Airport to Porto Airport.
What documentation or ID do you need to fly to Porto Airport?
The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Chicago O'Hare Intl Airport to Porto?
Based on momondo bookings for flights between Chicago O'Hare Intl Airport and Porto, the leading airline is United Airlines, making up 25% of the total bookings. Other popular airlines include TAP AIR PORTUGAL with 23%, Iberia with 12%, and KLM with 11%.
Best airlines flying from Chicago O'Hare Intl Airport to Porto
Compare and see reviews for airlines that fly from Chicago O'Hare Intl Airport to Porto with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $415 | Free Cancellation | Rating 7.1 1,885 reviews | |||
| PriceFrom $468 | Free Cancellation | Rating 7.2 10,000 reviews | |||
| PriceFrom $472 | Free Cancellation | Rating 7.0 2,776 reviews | |||
| PriceFrom $498 | Free Cancellation | Rating 8.0 7,946 reviews | |||
| PriceFrom $504 | Free Cancellation | Rating 6.6 7,008 reviews | |||
| PriceFrom $535 | Free Cancellation | Rating 6.7 7,139 reviews | |||
| PriceFrom $558 | Free Cancellation | Rating 7.5 1,623 reviews | |||
| PriceFrom $563 | Free Cancellation | Rating 7.8 1,358 reviews | |||
| PriceFrom $569 | Free Cancellation | Rating 7.4 8,790 reviews | |||
| PriceFrom $646 | Free Cancellation | Rating 7.1 9,537 reviews |
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Chicago to Porto?
momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Chicago to Porto. momondo saves you time and could save you money on your trip.
Can I find flights from Chicago to Porto with flexible booking policies on momondo?
Yes. momondo enables you to select and highlight flights to Porto from Chicago with this policy.
How can momondo help me find flights from Chicago to Porto?
Once all potential Chicago to Porto flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Chicago to Porto right now. Can momondo alert me if prices change?
Of course. momondo tracks the price of Chicago to Porto flights. All you need is a valid email address and we will do the rest; it is that quick and easy.