Statistics on Chicago-Porto flights: what is the right price and when to buy your plane ticket?
Best time to go: what is the RIGHT price for a round-trip flight to Porto (from: Chicago)
The average price to go to Porto from Chicago airport is $ 721 (round trip). However, there are variations depending on the departure month. Thus, it is possible to pay for your plane ticket on average between $ 558 (in february) and $ 962 (in july), which is a saving of $ 164 or a surplus of $ 241 (compared to the average price) depending on the period you leave.
The analysis of all prices reveals that the most frequent price is between $495 to $550 and it is generally more economical to leave on a wednesday and return on a wednesday on a flight with 1 or more layovers.
Be careful, the cheapest months may correspond to unfavorable weather periods . Check out our page best time to go to Porto before booking your flight.
If you want to know when to book your flight at the best price, go straight to the second part of this page: When to buy your Chicago-Porto plane ticket.
How are these data calculated?
We have studied a sample of 29902 airfare prices from previous years for flights to Porto from Chicago and can thus establish precise and credible price variation trends based on different parameters. Of course, prices can vary from year to year, but the seasonal aspect of this data (recurrence of school holidays, events... from year to year) makes these statistics quite reliable.
Average price depending on the departure month
Data analysis:
By leaving in february, the price of the plane ticket will statistically be the cheapest ($ 558, saving $ 164 compared to the average price over the year which is $ 721). Conversely, july will be the most expensive ($ 962).
Flight Chicago-Porto: when is the best time to go for the best price?
| Month | Good price* | Average price | Our opinion |
|---|---|---|---|
| January | $ 514 | $ 604 | good price |
| February | $ 501 | $ 558 the cheapest | very good price |
| March | $ 569 | $ 679 | good price |
| April | $ 583 | $ 651 | good price |
| May | $ 690 | $ 746 | fair price |
| June | $ 821 | $ 927 | high price |
| July | $ 832 | $ 962 the most expensive | very high price |
| August | $ 718 | $ 815 | fair price |
| September | $ 608 | $ 680 | good price |
| October | $ 576 | $ 640 | good price |
| November | $ 515 | $ 586 | good price |
| December | $ 585 | $ 803 | fair price |
*great price to buy your plane ticket: if you see this price or cheaper during your flight search, go for it and buy it!
Price breakdown to travel from Chicago to Porto
Data analysis:
The prices for flights from Chicago to Porto range from $440 to $1209. 6% of tickets were purchased at the minimum price (from $440 to $495), 1% at the maximum price (from $1154 to $1209). The majority of plane tickets were purchased in the range of $495 to $550 (15% of tickets).
Cheapest airlines for the Chicago->Porto flight
There are 15 companies that serve Chicago from Porto airport: Iberia, TAP, British Airways, United, Turkish Airlines, Air France, KLM, Spirit Airlines, Swiss, Delta, Lufthansa, Finnair, Air Canada, Frontier Airlines and American Airlines.
Data analysis:
Of the 29902 flights analyzed in previous years, Iberia was the airline that offered the best fare most often in the flight ticket search results (19% of the time) on the Chicago->Porto route.
Which day of the week to leave?
Data analysis:
Statistically, Chicago-Porto flights departing on a wednesday are cheaper than on other days of the week. By choosing a wednesday as your departure date, you can save an average of $59. On the other hand, departing on a saturday may cost you an additional $40.
Which day of the week to come back?
Data analysis:
Statistically, return flights from Porto to Chicago departing on a wednesday are cheaper than on other days of the week. By choosing a wednesday for your return date, you will save an average of $63. Conversely, departing from Porto on a saturday may cost you an additional $42.
Top prices Chicago-Porto
| Round trip | Dates | Price | |
|---|---|---|---|
| Chicago → Porto | 04-11 to 11-11-2025 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 05-11 to 12-11-2025 | $ 487 | layover flight with Swiss |
| Chicago → Porto | 11-11 to 18-11-2025 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 12-11 to 19-11-2025 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 18-11 to 25-11-2025 | $ 503 | layover flight with British Airways |
| Chicago → Porto | 19-11 to 26-11-2025 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 13-01 to 20-01-2026 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 17-02 to 24-02-2026 | $ 508 | layover flight with Iberia |
| Chicago → Porto | 18-02 to 25-02-2026 | $ 507 | layover flight with British Airways |
| Chicago → Porto | 03-03 to 10-03-2026 | $ 507 | layover flight with British Airways |
When to book your flight Chicago - Porto to get the cheapest price?
Statistically, you will make the biggest savings by buying your plane ticket between 11 to 12 months in advance. However, you may end up paying a high price if you book between 0 to 1 month in advance.
Did you know: the price of plane tickets not only varies depending on how far in advance you book, but also on the day of the week you book! So, to maximize your chances of getting the best price for a Chicago-Porto flight, it is recommended to book your ticket on a friday.
How far in advance should I buy my flight?
Data analysis:
To get the cheapest flight ticket from Chicago to Porto, it is recommended to buy it 11 to 12 months before departure (it is then on average 680 $, which is a saving of 41 $ compared to the overall average price). On the other hand, if you buy your ticket 0 to 1 month in advance, you will pay the full price (80 $ more than the average price).
Depending on the departure month
The best time to buy your Chicago to Porto flight ticket may vary depending on your departure month. Therefore, we offer you statistics on when to book your flight month by month.
| Departure on... | How far in advance should I book? |
|---|---|
| January | Best time: 5 to 6 months before departure (average price: 510 $) Other interesting period(s): 2 to 3 months ($ 598), 3 to 4 months ($ 537), 4 to 5 months ($ 519) |
| February | Best time: 6 to 7 months before departure (average price: 491 $) Other interesting period(s): 2 to 3 months ($ 533), 3 to 4 months ($ 533), 4 to 5 months ($ 510), 5 to 6 months ($ 518) |
| March | Best time: 7 to 8 months before departure (average price: 575 $) Other interesting period(s): 2 to 3 months ($ 646), 3 to 4 months ($ 644), 4 to 5 months ($ 676), 5 to 6 months ($ 619), 6 to 7 months ($ 603) |
| April | Best time: 0 to 1 month before departure (average price: 624 $) Other interesting period(s): 1 to 2 months ($ 625), 3 to 4 months ($ 642), 4 to 5 months ($ 626) |
| May | Best time: 9 to 10 months before departure (average price: 628 $) Other interesting period(s): 6 to 7 months ($ 712), 7 to 8 months ($ 714), 8 to 9 months ($ 669) |
| June | Best time: 9 to 10 months before departure (average price: 841 $) Other interesting period(s): 2 to 3 months ($ 917), 3 to 4 months ($ 918), 4 to 5 months ($ 920), 5 to 6 months ($ 908), 7 to 8 months ($ 921), 8 to 9 months ($ 882) |
| July | Best time: 9 to 10 months before departure (average price: 854 $) Other interesting period(s): 3 to 4 months ($ 953), 4 to 5 months ($ 865), 5 to 6 months ($ 863), 6 to 7 months ($ 893), 7 to 8 months ($ 939), 8 to 9 months ($ 902) |
| August | Best time: 1 to 2 months before departure (average price: 748 $) Other interesting period(s): 2 to 3 months ($ 784), 5 to 6 months ($ 799), 6 to 7 months ($ 777) |
| September | Best time: 2 to 3 months before departure (average price: 629 $) Other interesting period(s): 3 to 4 months ($ 673), 4 to 5 months ($ 663), 5 to 6 months ($ 668), 8 to 9 months ($ 674) |
| October | Best time: 4 to 5 months before departure (average price: 573 $) Other interesting period(s): 1 to 2 months ($ 616), 2 to 3 months ($ 579), 3 to 4 months ($ 574), 5 to 6 months ($ 586), 6 to 7 months ($ 612), 7 to 8 months ($ 625), 8 to 9 months ($ 626), 10 to 11 months ($ 616) |
| November | Best time: 4 to 5 months before departure (average price: 527 $) Other interesting period(s): 1 to 2 months ($ 570), 2 to 3 months ($ 557), 3 to 4 months ($ 558), 5 to 6 months ($ 548), 6 to 7 months ($ 573) |
| December | Best time: 9 to 10 months before departure (average price: 654 $) Other interesting period(s): 1 to 2 months ($ 747), 2 to 3 months ($ 773), 3 to 4 months ($ 794), 4 to 5 months ($ 746), 5 to 6 months ($ 720) |
What day of the week should I book my flight ticket?
Data analysis:
Statistically, friday is the day when plane tickets for Chicago->Porto are the cheapest. So, by buying your plane ticket on a friday, you will save $9. Conversely, by buying it on a thursday, you may end up paying $16 more.
Chicago to Porto: flight price when booking today
Information: this data is not statistics but comes from real prices collected less than 7 days ago. Some months may not be available as we do not have enough data for them.
| Month | Current price | Our opinion | |
|---|---|---|---|
| April 2025 | $ 709 $559 to $923 | high price | Find a flight |
| May 2025 | $ 727 $580 to $1368 | very good price | Find a flight |
| June 2025 | $ 814 $681 to $1088 | very good price | Find a flight |
| July 2025 | $ 779 $640 to $1019 | very good price | Find a flight |
| August 2025 | $ 706 $569 to $901 | very good price | Find a flight |
| September 2025 | $ 638 $543 to $726 | very good price | Find a flight |
| October 2025 | $ 615 $535 to $704 | very good price | Find a flight |
| November 2025 | $ 579 $487 to $771 | very good price | Find a flight |
| December 2025 | $ 639 $541 to $888 | very good price | Find a flight |
| January 2026 | $ 564 $507 to $628 | very good price | Find a flight |
| February 2026 | $ 547 $507 to $593 | very good price | Find a flight |
| March 2026 | $ 569 $507 to $631 | very good price | Find a flight |
Data analysis:
Compared to the average price, may, june, july, august, september, october, november, december, january, february and march are cheaper to travel to Porto. So it may be interesting to book now to leave during these months!