Find cheap United Airlines flights to Porto
DFW — OPO
Nov 3 — Nov 101
Round-trip
1 adult, Economy
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Cheapest United Airlines flights from USA to PortoExplore the most affordable United Airlines flight options available from USA to Porto. Find the lowest fares with prices last updated on October 4, 2026.
Explore the most affordable United Airlines flight options available from USA to Porto. Find the lowest fares with prices last updated on October 4, 2026.
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/37:05 pm -
1 stop9h 25m
Thu 11/1912:35 pm -
1 stop28h 51m
Deal found 9/29![United Airlines logo]()
$655
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/112:40 pm -
2 stops13h 50m
Thu 11/2612:35 pm -
1 stop25h 42m
Deal found 9/29![United Airlines logo]()
$659
This United Airlines deal was found by Cheapflights users on 10/1. 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.
Mon 11/25:30 am -
2 stops23h 00m
Thu 11/1912:35 pm -
1 stop14h 24m
Deal found 10/1![United Airlines logo]()
$660
Best United Airlines flights from USA to PortoDiscover carefully curated United Airlines flight deals from USA to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 4, 2026.
Discover carefully curated United Airlines flight deals from USA to Porto that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated October 4, 2026.
This United Airlines deal was found by Cheapflights users on 10/1. 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.
Mon 11/210:30 am -
1 stop18h 00m
Thu 11/1912:35 pm -
1 stop14h 24m
Deal found 10/1![United Airlines logo]()
$655
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/95:30 am -
2 stops23h 00m
Tue 11/2412:35 pm -
1 stop14h 24m
Deal found 9/29![United Airlines logo]()
$659
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 11/185:30 am -
2 stops23h 00m
Wed 11/2512:35 pm -
2 stops16h 24m
Deal found 9/30![United Airlines logo]()
$659
Direct United Airlines flights from USA to PortoExplore non-stop United Airlines flight options from USA to Porto based on user searches, and compare prices and availability for your desired travel dates. Data last updated October 4, 2026.
Explore non-stop United Airlines flight options from USA to Porto based on user searches, and compare prices and availability for your desired travel dates. Data last updated October 4, 2026.
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/249:45 pm -
Nonstop6h 45m
Thu 3/412:35 pm -
Nonstop8h 25m
Deal found 9/30![United Airlines logo]()
$685
This United Airlines deal was found by Cheapflights users on 9/30. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/59:45 pm -
Nonstop6h 45m
Fri 11/2012:35 pm -
Nonstop8h 25m
Deal found 9/30![United Airlines logo]()
$690
This United Airlines deal was found by Cheapflights users on 10/4. 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.
Fri 11/69:45 pm -
Nonstop6h 45m
Thu 11/1912:35 pm -
Nonstop8h 25m
Deal found 10/4![United Airlines logo]()
$714
Last-minute United Airlines flights from USA to PortoDiscover last-minute United Airlines flight deals from USA to Porto. Data last updated October 4, 2026 and is based on user searches.
Discover last-minute United Airlines flight deals from USA to Porto. Data last updated October 4, 2026 and is based on user searches.
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/37:05 pm -
1 stop9h 25m
Thu 11/1912:35 pm -
1 stop28h 51m
Deal found 9/29![United Airlines logo]()
$655
This United Airlines deal was found by Cheapflights users on 9/29. 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 11/112:40 pm -
2 stops13h 50m
Thu 11/2612:35 pm -
1 stop25h 42m
Deal found 9/29![United Airlines logo]()
$659
This United Airlines deal was found by Cheapflights users on 10/1. 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.
Mon 11/25:30 am -
2 stops23h 00m
Thu 11/1912:35 pm -
1 stop14h 24m
Deal found 10/1![United Airlines logo]()
$660
One-way United Airlines flights to PortoSearch for one-way United Airlines flight options to Porto. Find affordable one-way fares based on user searches. Data last updated October 4, 2026.
Search for one-way United Airlines flight options to Porto. Find affordable one-way fares based on user searches. Data last updated October 4, 2026.
This United Airlines deal was found by Cheapflights users on 10/1. 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 3/178:45 am -
2 stops20h 45m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![United Airlines logo]()
$324
This United Airlines deal was found by Cheapflights users on 10/1. 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 3/107:32 am -
2 stops18h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/1![United Airlines logo]()
$329
This United Airlines deal was found by Cheapflights users on 10/2. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 3/17:32 pm -
3 stops29h 58m
Wed 12/3112:00 am -
Nonstop0h 00m
Deal found 10/2![United Airlines logo]()
$334
Flights to Porto with United Airlines at a glance
Find detailed information about United Airlines flights from USA to Porto. Explore the options provided by United Airlines to plan your journey from USA to Porto. Data last updated October 4, 2026.
Cheapflights Insights
Find cheap United Airlines flights to Porto
US0-OPO
EWR-OPO
BOS-OPO
MIA-OPO
DEN-OPO
How long is the flight to Porto with United Airlines?
On average, United Airlines flights from the United States to Porto take 9 hours 12 minutes. Flights to Porto from other popular cities in the United States will vary in length. Below are a few examples of popular routes and their flight times.
United Airlines weekly flight availability to Porto
The most flights to Porto operated by United Airlines are scheduled on a Monday (1 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (1 on average).
When is the best time to book a flight to Porto with United Airlines?
The best time to book a flight to Porto with United Airlines is 51 days before departure. On average, fares are higher if you book on the same day as departure.
FAQs about flights to Porto with United Airlines
Reviews of United Airlines
See what Cheapflights users have to say about their United Airlines experience.
Overview
Reviews
United Airlines
10,000 reviews
Overview
Food
6.7
Comfort
7.3
Entertainment
7.1
Boarding
7.7
Crew
8.1
Recent reviews
10.0
|Oct 2026Is good
10.0
|Sep 2026Everything was good
8.0
|Sep 2026The flight was on time and boardi g was very organized and timely. Snacks are awful and having one little glass of juice was terrible. Fortunately, I had my water to keep me hydrated.
10.0
|Aug 2026Staff friendly, good boarding experience
4.0
|Aug 2026Had to go through TSA again, already purchased bottle drink. TSA would not let through, United changed gates last minute. This experience bad for everyone. Staff rude, not our fault. Staff from Chicago to Wichita excellent!
1 out of 3334
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