$326+ Cheap flights from Chicago (CHI) to Porto (OPO)
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 8/30. Fares are subject to change and may not be available on all flights or dates of travel.
CHI — OPO
Sep 3 — Sep 101
Round-trip
1 adult, Economy
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Find cheap flights from Chicago to Porto with Cheapflights
1. Tell us where you want to go
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 August 4, 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 August 4, 2026.
This lol.travel deal was found by Cheapflights users on 8/2. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 pm -
1 stop16h 50m
Thu 10/87:00 am -
1 stop11h 40m
Deal found 8/2![TAP AIR PORTUGAL logo]()
$627
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Thu 9/246:00 pm -
1 stop23h 00m
Wed 10/710:00 am -
1 stop12h 00m
Deal found 7/31![TAP AIR PORTUGAL logo]()
$644
This oojo deal was found by Cheapflights users on 7/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/18:10 pm -
1 stop15h 50m
Sun 11/87:00 am -
1 stop14h 30m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$645
This oojo deal was found by Cheapflights users on 7/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:00 pm -
1 stop17h 00m
Wed 10/77:00 am -
1 stop15h 00m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$647
This oojo deal was found by Cheapflights users on 7/31. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/216:00 pm -
1 stop17h 00m
Tue 10/2712:00 pm -
1 stop33h 30m
Deal found 7/31![TAP AIR PORTUGAL logo]()
$652
This FlightHub deal was found by Cheapflights users on 7/30. 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.
Thu 10/226:00 pm -
1 stop15h 00m
Thu 10/298:00 pm -
1 stop25h 30m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$658
This FlightHub deal was found by Cheapflights users on 8/2. 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.
Thu 10/16:00 pm -
1 stop33h 00m
Wed 10/149:00 am -
1 stop13h 00m
Deal found 8/2![TAP AIR PORTUGAL logo]()
$662
This Gotogate deal was found by Cheapflights users on 8/3. 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.
Wed 10/76:00 pm -
1 stop23h 10m
Wed 10/1410:00 am -
1 stop12h 00m
Deal found 8/3![TAP AIR PORTUGAL logo]()
$675
This Mytrip deal was found by Cheapflights users on 7/31. 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.
Wed 9/911:05 am -
3 stops25h 55m
Wed 9/169:15 pm -
2 stops25h 43m
Deal found 7/31![Multiple Airlines logo]()
$682
This Mytrip deal was found by Cheapflights users on 7/31. 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 9/1411:45 am -
3 stops21h 15m
Mon 9/2111:00 am -
3 stops33h 35m
Deal found 7/31![Multiple Airlines logo]()
$758
This Mytrip deal was found by Cheapflights users on 8/2. 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.
Wed 9/163:20 pm -
3 stops19h 40m
Wed 9/2310:00 am -
3 stops31h 00m
Deal found 8/2![Multiple Airlines logo]()
$759
This Delta deal was found by Cheapflights users on 8/3. 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 11/11:27 pm -
2 stops15h 08m
Fri 11/65:00 am -
2 stops23h 33m
Deal found 8/3![Delta logo]()
$775
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 August 4, 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 August 4, 2026.
This Delta deal was found by Cheapflights users on 8/2. 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.
Sat 1/165:25 pm -
2 stops35h 10m
Tue 1/265:00 am -
2 stops17h 25m
Deal found 8/2![Delta logo]()
$781
This KLM deal was found by Cheapflights users on 7/31. 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.
Wed 10/281:23 pm -
2 stops13h 42m
Wed 11/45:00 am -
1 stop15h 25m
Deal found 7/31![KLM logo]()
$799
This TAP AIR PORTUGAL deal was found by Cheapflights users on 8/3. 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 TAP AIR PORTUGAL is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 1/277:00 pm -
1 stop14h 00m
Sun 1/317:00 am -
1 stop14h 30m
Deal found 8/3![TAP AIR PORTUGAL logo]()
$808
This United Airlines deal was found by Cheapflights users on 8/1. 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 11/184:20 pm -
1 stop13h 25m
Sun 11/2212:35 pm -
2 stops17h 04m
Deal found 8/1![United Airlines logo]()
$847
This Turkish Airlines deal was found by Cheapflights users on 8/3. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/28:10 pm -
1 stop37h 30m
Sun 10/1110:45 am -
1 stop28h 55m
Deal found 8/3![Turkish Airlines logo]()
$853
This KLM deal was found by Cheapflights users on 7/31. 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.
Wed 10/281:23 pm -
2 stops13h 42m
Tue 11/39:55 am -
2 stops16h 35m
Deal found 7/31![KLM logo]()
$809
This Delta deal was found by Cheapflights users on 8/1. 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 11/19:29 am -
2 stops19h 06m
Sun 11/85:55 am -
2 stops18h 05m
Deal found 8/1![Delta logo]()
$832
This United Airlines deal was found by Cheapflights users on 8/3. 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 10/249:45 pm -
2 stops30h 45m
Sat 10/3112:35 pm -
2 stops36h 24m
Deal found 8/3![United Airlines logo]()
$878
This Turkish Airlines deal was found by Cheapflights users on 8/3. 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 Turkish Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/1411:25 am -
1 stop22h 25m
Mon 9/214:50 pm -
1 stop22h 50m
Deal found 8/3![Turkish Airlines logo]()
$922
This Delta deal was found by Cheapflights users on 8/1. 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 1/219:30 am -
2 stops19h 05m
Sun 1/245:00 am -
2 stops19h 37m
Deal found 8/1![Delta logo]()
$875
This Delta deal was found by Cheapflights users on 8/3. 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 12/259:30 am -
2 stops19h 00m
Thu 12/315:00 am -
1 stop15h 25m
Deal found 8/3![Delta logo]()
$886
This KLM deal was found by Cheapflights users on 8/1. 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.
Fri 9/257:01 pm -
2 stops14h 29m
Thu 10/85:55 am -
2 stops16h 24m
Deal found 8/1![KLM logo]()
$1,031
This Delta deal was found by Cheapflights users on 7/30. 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 9/205:10 pm -
2 stops16h 20m
Thu 10/15:00 am -
2 stops21h 30m
Deal found 7/30![Delta logo]()
$964
This Delta deal was found by Cheapflights users on 7/30. 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 9/235:10 pm -
2 stops16h 15m
Wed 10/75:00 am -
2 stops21h 30m
Deal found 7/30![Delta logo]()
$964
This Delta deal was found by Cheapflights users on 8/1. 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 9/155:11 pm -
2 stops16h 14m
Tue 9/225:00 am -
2 stops19h 19m
Deal found 8/1![Delta logo]()
$973
This Delta deal was found by Cheapflights users on 7/30. 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.
Sat 10/2411:33 am -
2 stops18h 02m
Sat 10/315:00 am -
2 stops18h 00m
Deal found 7/30![Delta logo]()
$996
This Delta deal was found by Cheapflights users on 8/2. 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 10/110:48 am -
2 stops15h 42m
Wed 10/145:00 am -
2 stops19h 00m
Deal found 8/2![Delta logo]()
$1,025
This Delta deal was found by Cheapflights users on 8/3. 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 9/255:10 pm -
2 stops16h 15m
Thu 10/85:55 am -
2 stops16h 52m
Deal found 8/3![Delta logo]()
$1,032
This Delta deal was found by Cheapflights users on 7/31. 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 9/141:19 pm -
2 stops15h 11m
Mon 9/215:00 am -
2 stops19h 19m
Deal found 7/31![Delta logo]()
$1,033
This Delta deal was found by Cheapflights users on 7/30. 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.
Sat 10/311:35 am -
2 stops14h 55m
Sun 10/115:00 am -
2 stops17h 47m
Deal found 7/30![Delta logo]()
$1,084
Last-minute flights from Chicago to PortoDiscover last-minute flight deals from Chicago to Porto. Data last updated August 4, 2026 and is based on user searches.
Discover last-minute flight deals from Chicago to Porto. Data last updated August 4, 2026 and is based on user searches.
This Mytrip deal was found by Cheapflights users on 7/31. 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.
Wed 9/911:05 am -
3 stops25h 55m
Wed 9/169:15 pm -
2 stops25h 43m
Deal found 7/31![Multiple Airlines logo]()
$682
This Cheapflightsfares deal was found by Cheapflights users on 7/30. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/96:00 pm -
1 stop20h 25m
Wed 9/169:15 pm -
1 stop21h 25m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$710
This lol.travel deal was found by Cheapflights users on 7/30. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/106:00 pm -
1 stop24h 40m
Wed 9/236:00 pm -
1 stop24h 40m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$696
This Kiwi.com deal was found by Cheapflights users on 7/31. 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.
Thu 9/103:20 pm -
1 stop14h 25m
Wed 9/2310:30 pm -
2 stops42h 30m
Deal found 7/31![Multiple Airlines logo]()
$917
This Mytrip deal was found by Cheapflights users on 7/31. 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 9/1411:45 am -
3 stops21h 15m
Mon 9/2111:00 am -
3 stops33h 35m
Deal found 7/31![Multiple Airlines logo]()
$758
This Mytrip deal was found by Cheapflights users on 8/2. 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.
Wed 9/163:20 pm -
3 stops19h 40m
Wed 9/2310:00 am -
3 stops31h 00m
Deal found 8/2![Multiple Airlines logo]()
$759
This Mytrip deal was found by Cheapflights users on 8/3. 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 9/173:20 pm -
3 stops17h 40m
Thu 9/244:00 pm -
3 stops25h 00m
Deal found 8/3![Multiple Airlines logo]()
$936
This oojo deal was found by Cheapflights users on 7/30. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/236:00 pm -
1 stop17h 00m
Wed 10/77:00 am -
1 stop15h 00m
Deal found 7/30![TAP AIR PORTUGAL logo]()
$647
This Gotogate deal was found by Cheapflights users on 7/31. 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.
Thu 9/246:00 pm -
1 stop23h 00m
Wed 10/710:00 am -
1 stop12h 00m
Deal found 7/31![TAP AIR PORTUGAL logo]()
$644
This lol.travel deal was found by Cheapflights users on 8/2. 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 lol.travel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/256:00 pm -
1 stop16h 50m
Thu 10/87:00 am -
1 stop11h 40m
Deal found 8/2![TAP AIR PORTUGAL logo]()
$627
This oojo deal was found by Cheapflights users on 8/3. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/266:05 pm -
1 stop14h 55m
Thu 10/85:05 am -
1 stop13h 35m
Deal found 8/3![TAP AIR PORTUGAL logo]()
$645
This Mytrip deal was found by Cheapflights users on 8/2. 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 9/2811:45 am -
3 stops21h 15m
Sun 10/44:00 pm -
3 stops28h 35m
Deal found 8/2![Multiple Airlines logo]()
$933
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 August 4, 2026.
Search for one-way flight options from Chicago to Porto. Find affordable one-way fares based on user searches. Data last updated August 4, 2026.
This Kiwi.com deal was found by Cheapflights users on 8/1. 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 8/307:25 pm -
2 stops18h 10m
Deal found 8/1![Multiple Airlines logo]()
$326
This Kiwi.com deal was found by Cheapflights users on 8/3. 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.
Wed 10/1410:25 pm -
3 stops40h 35m
Deal found 8/3![Multiple Airlines logo]()
$328
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 9/147:25 pm -
2 stops22h 15m
Deal found 8/3![Multiple Airlines logo]()
$338
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 12/16:30 pm -
2 stops32h 05m
Deal found 8/2![Multiple Airlines logo]()
$340
This Kiwi.com deal was found by Cheapflights users on 7/30. 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 12/66:30 pm -
2 stops17h 55m
Deal found 7/30![Multiple Airlines logo]()
$342
This Kiwi.com deal was found by Cheapflights users on 8/3. 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 10/67:25 pm -
3 stops29h 25m
Deal found 8/3![Multiple Airlines logo]()
$344
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 11/76:30 pm -
3 stops35h 05m
Deal found 8/2![Multiple Airlines logo]()
$347
This Kiwi.com deal was found by Cheapflights users on 8/2. 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.
Wed 11/116:30 pm -
3 stops37h 05m
Deal found 8/2![Multiple Airlines logo]()
$351
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 11/166:30 pm -
3 stops18h 30m
Deal found 8/2![Multiple Airlines logo]()
$354
This Delta deal was found by Cheapflights users on 8/2. 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 11/111:00 pm -
2 stops14h 05m
Deal found 8/2![Delta logo]()
$360
This Delta deal was found by Cheapflights users on 8/2. 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 11/161:00 pm -
2 stops15h 35m
Deal found 8/2![Delta logo]()
$364
This Kiwi.com deal was found by Cheapflights users on 8/2. 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 11/167:25 am -
3 stops50h 55m
Deal found 8/2![Multiple Airlines logo]()
$412
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 August 4, 2026.
Most accurate provider | Ovago 3 stars |
|---|---|
Most trusted provider | Ovago 3 stars |
Round-trip from | $627 (lol.travel) |
One-way from | $326 (Kiwi.com) |
Popular in | August |
Cheapest in | April |
Average price | $1,165 |
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 2,558,603 searches. Data last updated August 4, 2026.
Use the filters below to find and compare flights from Chicago to Porto that are best for you.
Fly from
Fly to
Route
Depart
Return
Cheapest round-trip
ChicagoPorto
MDW - OPO
MDWOPO
Chicago Midway
Sat 1/16
5:25 pm-10:35 am
2 stops35h 10m
Porto
Tue 1/26
5:00 am-4:25 pm
2 stops17h 25m
$781
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 10/28
1:23 pm-8:05 am
2 stops13h 42m
Porto
Wed 11/4
5:00 am-2:25 pm
1 stop15h 25m
$799
Quickest round-trip
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 1/27
7:00 pm-3:00 pm
1 stop14h 00m
Porto
Sun 1/31
7:00 am-3:30 pm
1 stop14h 30m
$808
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 10/28
1:23 pm-8:05 am
2 stops13h 42m
Porto
Tue 11/3
9:55 am-8:30 pm
2 stops16h 35m
$809
ChicagoPorto
MDW - OPO
MDWOPO
Chicago Midway
Sun 11/1
9:29 am-10:35 am
2 stops19h 06m
Porto
Sun 11/8
5:55 am-6:00 pm
2 stops18h 05m
$832
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Wed 11/18
4:20 pm-11:45 am
1 stop13h 25m
Porto
Sun 11/22
12:35 pm-11:39 pm
2 stops17h 04m
$847
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Fri 10/2
8:10 pm-3:40 pm
1 stop37h 30m
Porto
Sun 10/11
10:45 am-9:40 am
1 stop28h 55m
$853
ChicagoPorto
MDW - OPO
MDWOPO
Chicago Midway
Thu 1/21
9:30 am-10:35 am
2 stops19h 05m
Porto
Sun 1/24
5:00 am-6:37 pm
2 stops19h 37m
$875
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Sat 10/24
9:45 pm-9:30 am
2 stops30h 45m
Porto
Sat 10/31
12:35 pm-7:59 pm
2 stops36h 24m
$878
ChicagoPorto
ORD - OPO
ORDOPO
Chicago O'Hare Intl
Fri 12/25
9:30 am-10:30 am
2 stops19h 00m
Porto
Thu 12/31
5:00 am-2:25 pm
1 stop15h 25m
$886
Showing 1-10 of 38 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 August.
| 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 $558). Flying from Chicago to Porto in June is currently the most expensive (average of $1,125). 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 $723 and $1,351 in September.The cheapest round-trip price found within the last 5 days was $627 on TAP AIR PORTUGAL (Sep 25-Oct 8).
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 17 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 August 4, 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.
Boarding
7.7
Food
6.6
Comfort
7.3
Crew
8.1
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Food
6.6
Comfort
7.3
Crew
8.1
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Food
6.6
Comfort
7.3
Crew
8.1
Entertainment
7.1
Overall
7.4
Reviews
1 / 20
2.0
MediocreDawn,Aug 2026
ORD - DEN
Boarding
7.7
Food
6.6
Comfort
7.3
Crew
8.1
Entertainment
7.1
Overall
7.4
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
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Alternative routes for Chicago to Porto
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Complete your trip
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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 August 4, 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 August 4, 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 August 4, 2026.
Top 7 airlines flying from Chicago to Porto
Discover the top 7 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 2,558,603 searches. Data last updated August 4, 2026.
| Airline | Cheapest | Average | Flexibility | On-time |
|---|---|---|---|---|
| Cheapest$451 | Average$845 | FlexibilityNo cancel fee | On-timeN/A | |
| Cheapest$474 | Average$610 | FlexibilityNo cancel fee | On-time76% | |
| Cheapest$489 | Average$885 | FlexibilityNo cancel fee | On-time69% | |
| Cheapest$519 | Average$747 | FlexibilityNo cancel fee | On-time77% | |
| Cheapest$524 | Average$832 | FlexibilityNo cancel fee | On-time71% | |
| Cheapest$531 | Average$679 | FlexibilityNo cancel fee | On-time75% | |
| Cheapest$618 | Average$672 | FlexibilityNo cancel fee | On-time77% |