$308+ Cheap flights from Chicago (CHI) to Porto (OPO)
This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/28. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Oct 17 — Oct 241
Round-trip
1 adult, Economy
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Find cheap flights from Chicago to Porto with Cheapflights
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Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”2. Select your favorite providers
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Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.Cheap flight deals from Chicago to Porto
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Cheapest flights from Chicago to PortoExplore the most affordable flight options available from Chicago to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
Explore the most affordable flight options available from Chicago to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2026.
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1911:05 am -
1 stop13h 45m
Wed 11/412:35 pm -
1 stop13h 30m
Deal found 9/16![Multiple Airlines logo]()
$566
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/319:48 pm -
1 stop30h 42m
Thu 11/1912:35 pm -
1 stop14h 55m
Deal found 9/16![United Airlines logo]()
$574
This Iberia deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/35:40 pm -
1 stop16h 20m
Tue 11/178:20 am -
1 stop12h 35m
Deal found 9/16![Multiple Airlines logo]()
$575
This American Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/15:40 pm -
1 stop12h 05m
Wed 12/98:20 am -
1 stop12h 35m
Deal found 9/14![American Airlines logo]()
$576
This FlightHub deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 12/22:31 pm -
2 stops20h 19m
Wed 12/98:20 am -
1 stop12h 35m
Deal found 9/14![British Airways logo]()
$579
This Iberia deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Iberia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/13:16 pm -
2 stops14h 29m
Wed 12/98:20 am -
1 stop12h 35m
Deal found 9/14![Iberia logo]()
$580
This British Airways deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:05 pm -
1 stop19h 00m
Wed 11/48:40 pm -
2 stops26h 15m
Deal found 9/14![British Airways logo]()
$583
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:50 pm -
1 stop14h 40m
Wed 11/45:00 am -
1 stop15h 25m
Deal found 9/14![Delta logo]()
$584
This United Airlines deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/305:29 pm -
1 stop10h 01m
Wed 12/912:35 pm -
1 stop14h 58m
Deal found 9/14![United Airlines logo]()
$585
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/49:29 am -
2 stops16h 46m
Tue 11/105:55 am -
2 stops16h 44m
Deal found 9/16![Delta logo]()
$603
This Air France deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:49 pm -
2 stops16h 46m
Tue 11/35:00 am -
2 stops19h 00m
Deal found 9/15![Multiple Airlines logo]()
$618
This KLM deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:27 pm -
2 stops15h 13m
Wed 11/45:55 am -
2 stops16h 52m
Deal found 9/14![Multiple Airlines logo]()
$620
Best flights from Chicago to PortoDiscover carefully curated flight deals from Chicago to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
Discover carefully curated flight deals from Chicago to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated September 17, 2026.
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/110:30 am -
1 stop15h 45m
Thu 11/1210:15 am -
1 stop13h 05m
Deal found 9/16![Delta logo]()
$584
This United Airlines deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/12:00 pm -
2 stops13h 30m
Wed 12/912:35 pm -
2 stops16h 54m
Deal found 9/12![United Airlines logo]()
$589
This Finnair deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Finnair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/145:40 pm -
1 stop20h 20m
Mon 2/228:40 pm -
2 stops29h 50m
Deal found 9/14![Multiple Airlines logo]()
$598
This United Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/2810:39 am -
1 stop17h 51m
Wed 11/412:35 pm -
1 stop13h 30m
Deal found 9/13![United Airlines logo]()
$591
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/49:29 am -
2 stops16h 46m
Wed 11/115:55 am -
2 stops16h 44m
Deal found 9/16![Delta logo]()
$603
This KLM deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:27 pm -
2 stops15h 13m
Wed 11/45:55 am -
2 stops16h 52m
Deal found 9/14![Multiple Airlines logo]()
$620
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/49:29 am -
2 stops16h 46m
Tue 11/105:55 am -
2 stops16h 44m
Deal found 9/16![Delta logo]()
$603
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/112:29 pm -
2 stops15h 01m
Sun 11/86:00 am -
1 stop13h 10m
Deal found 9/16![United Airlines logo]()
$646
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/95:13 pm -
2 stops16h 12m
Wed 11/185:00 am -
2 stops17h 18m
Deal found 9/14![Delta logo]()
$630
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/317:48 pm -
1 stop32h 42m
Wed 11/1112:35 pm -
1 stop13h 30m
Deal found 9/16![United Airlines logo]()
$653
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/36:25 pm -
1 stop21h 35m
Sun 11/85:55 am -
1 stop16h 20m
Deal found 9/16![Delta logo]()
$654
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/21:55 pm -
2 stops14h 40m
Sun 11/85:00 am -
2 stops21h 30m
Deal found 9/13![Delta logo]()
$668
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:29 am -
2 stops19h 06m
Wed 11/115:00 am -
2 stops19h 04m
Deal found 9/16![Delta logo]()
$668
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/141:35 pm -
2 stops15h 00m
Mon 2/226:25 am -
2 stops21h 39m
Deal found 9/16![Delta logo]()
$673
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 2/141:00 pm -
2 stops15h 35m
Mon 2/225:00 am -
2 stops19h 37m
Deal found 9/16![Delta logo]()
$673
This Delta deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 11/249:30 am -
2 stops19h 05m
Tue 12/15:55 am -
2 stops18h 06m
Deal found 9/12![Delta logo]()
$707
This Delta deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 1/211:00 pm -
2 stops15h 35m
Sun 1/315:00 am -
2 stops17h 50m
Deal found 9/16![Delta logo]()
$723
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:44 pm -
2 stops18h 21m
Tue 11/35:00 am -
2 stops19h 00m
Deal found 9/13![Delta logo]()
$797
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/146:44 pm -
2 stops14h 46m
Wed 10/215:00 am -
2 stops19h 00m
Deal found 9/14![Delta logo]()
$837
Last-minute flights from Chicago to PortoDiscover last-minute flight deals from Chicago to Porto. Data last updated September 17, 2026 and is based on user searches.
Discover last-minute flight deals from Chicago to Porto. Data last updated September 17, 2026 and is based on user searches.
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/131:27 pm -
2 stops15h 28m
Tue 10/206:15 am -
2 stops17h 45m
Deal found 9/13![Delta logo]()
$719
This Orbitz deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Orbitz is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/144:55 pm -
1 stop12h 50m
Wed 11/48:20 am -
1 stop12h 35m
Deal found 9/16![Iberia logo]()
$576
This American Airlines deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/184:55 pm -
1 stop12h 50m
Tue 11/312:25 pm -
2 stops15h 29m
Deal found 9/13![American Airlines logo]()
$586
This Delta deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 10/186:44 pm -
2 stops18h 21m
Tue 11/35:00 am -
2 stops19h 00m
Deal found 9/13![Delta logo]()
$797
This Gotogate deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/1911:05 am -
1 stop13h 45m
Wed 11/412:35 pm -
1 stop13h 30m
Deal found 9/16![Multiple Airlines logo]()
$566
This British Airways deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure British Airways is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/197:05 pm -
1 stop19h 00m
Wed 11/48:40 pm -
2 stops26h 15m
Deal found 9/14![British Airways logo]()
$583
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:50 pm -
1 stop14h 40m
Wed 11/45:00 am -
1 stop15h 25m
Deal found 9/14![Delta logo]()
$584
This KLM deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/191:27 pm -
2 stops15h 13m
Wed 11/45:55 am -
2 stops16h 52m
Deal found 9/14![Multiple Airlines logo]()
$620
This Expedia deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/276:40 pm -
1 stop12h 05m
Tue 11/38:40 pm -
1 stop24h 15m
Deal found 9/15![Iberia logo]()
$587
This Air France deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air France is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2712:49 pm -
2 stops16h 46m
Tue 11/35:00 am -
2 stops19h 00m
Deal found 9/15![Multiple Airlines logo]()
$618
This Delta deal was found by Cheapflights users on 9/14. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/306:04 am -
2 stops20h 11m
Fri 11/65:00 am -
2 stops23h 33m
Deal found 9/14![Delta logo]()
$772
This United Airlines deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/319:48 pm -
1 stop30h 42m
Thu 11/1912:35 pm -
1 stop14h 55m
Deal found 9/16![United Airlines logo]()
$574
One-way flights from Chicago to PortoSearch for one-way flight options from Chicago to Porto. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
Search for one-way flight options from Chicago to Porto. Find affordable one-way fares based on user searches. Data last updated September 17, 2026.
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/287:25 pm -
2 stops19h 15m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$308
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/297:25 pm -
2 stops15h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$319
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/173:20 pm -
3 stops41h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$323
This Mytrip deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/86:30 pm -
2 stops14h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Multiple Airlines logo]()
$337
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/11:55 pm -
2 stops16h 10m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$347
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/14:20 pm -
1 stop17h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Lufthansa logo]()
$355
This Mytrip deal was found by Cheapflights users on 9/13. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/56:30 pm -
2 stops22h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/13![Multiple Airlines logo]()
$359
This Kiwi.com deal was found by Cheapflights users on 9/12. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2710:25 pm -
2 stops39h 50m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/12![Multiple Airlines logo]()
$360
This Delta deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 2/19:30 am -
2 stops19h 05m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Delta logo]()
$365
This Kiwi.com deal was found by Cheapflights users on 9/17. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/226:30 pm -
2 stops18h 20m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/17![Multiple Airlines logo]()
$369
This Mytrip deal was found by Cheapflights users on 9/15. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/33:45 pm -
2 stops23h 35m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/15![Multiple Airlines logo]()
$370
This Kiwi.com deal was found by Cheapflights users on 9/16. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/211:45 am -
2 stops37h 00m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 9/16![Multiple Airlines logo]()
$416
Find flight deals from Chicago to Porto
Discover tips and strategies to find the most affordable flight options for your journey from Chicago (CHI) to Porto (OPO). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 17, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $566 (Gotogate) |
One-way from | $308 (Kiwi.com) |
Popular in | August |
Cheapest in | April |
Average price | $882 |
Cheapflights Fare Finder
Customize your flight search to find flights from Chicago to Porto 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, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
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Cheapest round-trip
ChicagoPorto
MDW Chicago Midway - OPO Porto
MDWOPO
Chicago Midway
Sat 10/17
3:20 pm-2:25 pm
3 stops41h 05m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$323
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Sun 11/8
6:30 pm-6:45 pm
3 stops42h 15m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$373
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Tue 10/13
4:55 pm-4:00 pm
1 stop17h 05m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$375
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Thu 12/24
9:50 pm-11:55 pm
1 stop20h 05m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$409
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Sun 9/27
2:00 pm-11:45 am
1 stop15h 45m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$427
ChicagoPorto
MDW Chicago Midway - OPO Porto
MDWOPO
Chicago Midway
Mon 2/1
8:47 pm-7:20 pm
3 stops40h 33m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$455
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Wed 11/4
7:00 am-9:30 am
2 stops20h 30m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$463
ChicagoPorto
MDW Chicago Midway - OPO Porto
MDWOPO
Chicago Midway
Wed 11/4
10:12 am-8:15 am
2 stops16h 03m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$463
Quickest round-trip
ChicagoPorto
ORD Chicago O'Hare Intl - OPO Porto
ORDOPO
Chicago O'Hare Intl
Tue 10/13
12:55 pm-9:45 am
2 stops14h 50m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$463
ChicagoPorto
MDW Chicago Midway - OPO Porto
MDWOPO
Chicago Midway
Sun 10/11
9:29 am-10:25 am
2 stops18h 56m
Porto
Wed 12/31
12:00 am-5:00 pm
Nonstop0h 00m
$469
Showing 1-10 of 35 resultsSorted by cheapest first
Compare providers for flights from Chicago to Porto
Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Chicago to Porto in September.
| Provider | Price Accuracy | Trust Score* |
|---|---|---|
| Price Accuracy1 star | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars | |
| Price Accuracy3 stars | Trust Score*3 stars |
- Most accurate provider: When it comes to deals on Chicago-Porto flights, users find the pricing of Ovago to be most consistent on Cheapflights vs. Ovago Users can find the same prices on Chicago-Porto flight deals on Cheapflights vs. Ovago >95% of the time. Price accuracy is based on data collected from Chicago-Porto flight searches over the past month and is updated monthly.
- Most trusted provider: When it comes to deals on Chicago-Porto flights, Cheapflights users trust Ovago the most. Ovago has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Chicago-Porto flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.
Best time to book a flight from Chicago to Porto
Have a flexible travel schedule? Discover the best time to fly to Porto from Chicago with our price prediction graph.
CHI-OPO
ORD-OPO
MDW-OPO
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.
Cheapflights Insights
Everything you need to know about your flight from Chicago to Porto
CHI-OPO
ORD-OPO
MDW-OPO
What is the cheapest month to book a flight from Chicago to Porto?
Currently, January is the cheapest month in which you can book a flight from Chicago to Porto (average of $577). Flying from Chicago to Porto in June is currently the most expensive (average of $1,141). 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.
How much does it cost to fly round-trip from Chicago to Porto?
Airfare is below average for this route at the moment.
Chicago to Porto flights typically cost between $805 and $1,109 in October.The cheapest round-trip price found within the last 5 days was $566 on Multiple Airlines (Oct 19-Nov 4).
How far ahead should I book a flight from Chicago to Porto?
The price you pay for your flight from Chicago to Porto may vary depending on when you book. For the best chance of a lower fare, look to book 68 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.
Reviews of airlines servicing Porto
Get insights into the airlines that provide service to Porto. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Porto. Reviews last updated September 17, 2026.
See what other customers who have flown with United Airlines,TAP AIR PORTUGAL, andIberia from Chicago to Porto have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Comfort
7.3
Food
6.7
Entertainment
7.1
Crew
8.1
Overall
7.4
Boarding
7.7
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Comfort
7.3
Food
6.7
Entertainment
7.1
Crew
8.1
Overall
7.4
Boarding
7.7
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Comfort
7.3
Food
6.7
Entertainment
7.1
Crew
8.1
Overall
7.4
Boarding
7.7
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Comfort
7.3
Food
6.7
Entertainment
7.1
Crew
8.1
Overall
7.4
Boarding
7.7
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Related info for your journey
Find useful and relevant information for your journey from Chicago to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
Traveling to a place near Porto?
Book flights to Porto if you plan to visit one of these locationsVila Nova de Gaia
Arcos de Valdevez
Coimbra
Aveiro
Browse thousands of different options on Cheapflights for your next trip
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Alternative routes for Chicago to Porto
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Complete your trip
Complete your trip to Porto by adding a car rental and/or hotel reservation to your travel itinerary.
Search flights from Chicago to Porto by cabin class
Find flights from Chicago to Porto, based on your preferred cabin class, be it economy, premium economy, business, or first class.
Chicago and Porto flights
Browse other Chicago and Porto flight options. Last updated on September 17, 2026.
Other flights from Chicago
Browse through other flights departing from Chicago. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Popular flight searches
Check out other popular destinations found by fellow travelers in 2026
Other flights to Porto
Explore flights to Porto departing from other origins. Flights are based on user searches made on Cheapflights and were last updated on September 17, 2026.
Top 6 airlines flying from Chicago to Porto
Discover the top 6 airlines that operate flights from Chicago to Porto. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 7,457,451 searches. Data last updated September 17, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$451 | Average$828 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$474 | Average$689 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$489 | Average$912 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$519 | Average$786 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$524 | Average$990 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$618 | Average$672 | FlexibilityNo cancel fee | On-time77% |