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$276+ Cheap flights from Houston 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 9/5. Fares are subject to change and may not be available on all flights or dates of travel.
HOU — OPO
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
1 adult, Economy
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Cheap flight deals from Houston to Porto

Discover tips and strategies to find the most affordable flight options for your journey from Houston (HO1) 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 14, 2025.

Round-trip from

$643
(United Airlines)

One-way from

$276
(Kiwi.com)

Popular in

December

Cheapest in

November

Average price

$789
From Houston to Porto
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One-way flight from Houston to Porto
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Highest demand for flights based on searches. 2% potential increase in price ($32 potential increase over avg. RT price).
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Cheapest flight prices on average. 5% potential price decrease ($57 potential savings vs. average RT price).
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Average for round-trip flights in August 2025
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Find flight deals from Houston to Porto

Cheapest flights from Houston to Porto
Explore the most affordable flight options available from Houston to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

This United Airlines deal was found by Cheapflights users on 8/13. 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 11/192:38 pmIAH - OPO
1 stop12h 52mUnited Airlines
Sun 11/236:00 amOPO - IAH
2 stops22h 31mUnited Airlines
Deal found 8/13$639
This United Airlines deal was found by Cheapflights users on 8/13. 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 11/121:31 pmIAH - OPO
1 stop13h 59mUnited Airlines
Sun 11/1612:35 pmOPO - IAH
1 stop15h 56mUnited Airlines
Deal found 8/13$643
This KLM deal was found by Cheapflights users on 8/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/283:30 pmIAH - OPO
1 stop17h 55mMultiple Airlines
Thu 1/811:25 amOPO - IAH
1 stop32h 30mMultiple Airlines
Deal found 8/12$660
This United Airlines deal was found by Cheapflights users on 8/12. 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.
Sun 12/287:25 amIAH - OPO
2 stops25h 50mUnited Airlines
Thu 1/86:00 amOPO - IAH
1 stop18h 15mUnited Airlines
Deal found 8/12$686
This Mytrip deal was found by Cheapflights users on 8/14. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/287:25 amIAH - OPO
3 stops33h 50mMultiple Airlines
Sun 10/59:15 pmOPO - IAH
2 stops29h 52mMultiple Airlines
Deal found 8/14$699
This Air Canada deal was found by Cheapflights users on 8/12. 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 Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/611:50 amIAH - OPO
2 stops20h 55mAir Canada
Sun 11/96:00 amOPO - IAH
2 stops33h 09mAir Canada
Deal found 8/12$708
This Mytrip deal was found by Cheapflights users on 8/12. 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.
Tue 9/910:20 amIAH - OPO
2 stops24h 25mMultiple Airlines
Tue 9/1611:50 amOPO - IAH
3 stops39h 17mMultiple Airlines
Deal found 8/12$709
This Mytrip deal was found by Cheapflights users on 8/13. 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.
Mon 9/87:25 amIAH - OPO
2 stops27h 20mMultiple Airlines
Tue 9/237:00 amOPO - IAH
2 stops20h 07mMultiple Airlines
Deal found 8/13$714
This Delta deal was found by Cheapflights users on 8/12. 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.
Sun 12/283:10 pmHOU - OPO
2 stops18h 15mDelta
Thu 1/811:15 amOPO - HOU
2 stops28h 17mDelta
Deal found 8/12$856
This KLM deal was found by Cheapflights users on 8/12. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/66:44 pmHOU - OPO
2 stops14h 41mKLM
Sun 11/96:30 amOPO - HOU
2 stops21h 10mKLM
Deal found 8/12$916
This Delta deal was found by Cheapflights users on 8/12. 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.
Mon 9/86:34 pmHOU - OPO
2 stops17h 21mDelta
Tue 9/2311:35 amOPO - HOU
2 stops28h 14mDelta
Deal found 8/12$1,027
This Delta deal was found by Cheapflights users on 8/12. 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.
Wed 10/16:37 pmHOU - OPO
2 stops18h 58mDelta
Sun 10/55:00 amOPO - HOU
2 stops23h 37mDelta
Deal found 8/12$1,091

Cheapflights Fare Finder

 
Customize your flight search to find flights from Houston 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 14, 2025.
Use the filters below to find and compare flights from Houston to Porto that are best for you.

Fly from

Houston

Fly to

Porto

Route

Depart

Return

Price

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 11/12

2:38 pm-9:30 am

1 stop12h 52m

Porto

Sun 11/16

12:35 pm-10:31 pm

1 stop15h 56m

$643

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sun 9/28

7:25 am-11:15 pm

3 stops33h 50m

Porto

Sun 10/5

9:15 pm-9:07 pm

2 stops29h 52m

$699

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 11/6

11:50 am-2:45 pm

2 stops20h 55m

Porto

Sun 11/9

6:00 am-9:09 am

2 stops33h 09m

$708

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 11/6

10:41 am-7:40 am

2 stops14h 59m

Porto

Sun 11/9

8:20 am-11:32 pm

2 stops21h 12m

$708

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Sun 12/28

3:10 pm-3:25 pm

2 stops18h 15m

Porto

Thu 1/8

11:15 am-9:32 am

2 stops28h 17m

$856

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Thu 11/6

6:44 pm-3:25 pm

2 stops14h 41m

Porto

Sun 11/9

6:30 am-9:40 pm

2 stops21h 10m

$894

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Mon 9/8

6:34 pm-10:15 pm

2 stops21h 41m

Porto

Tue 9/23

11:35 am-9:49 am

2 stops28h 14m

$1,027

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Wed 10/1

6:37 pm-7:35 pm

2 stops18h 58m

Porto

Sun 10/5

5:00 am-10:37 pm

2 stops23h 37m

$1,091

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Thu 9/18

10:44 am-3:35 pm

2 stops22h 51m

Porto

Wed 9/24

6:15 am-10:37 pm

2 stops22h 22m

$1,256

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Sat 8/30

10:22 am-3:30 pm

2 stops23h 08m

Porto

Fri 9/12

9:20 am-10:37 pm

2 stops19h 17m

$1,361

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 26 results
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Best time to book a flight from Houston to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from Houston with our price prediction graph.
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 Houston to Porto

What is the cheapest month to book a flight from Houston to Porto?

Currently, January is the cheapest month in which you can book a flight from Houston to Porto (average of $523). Flying from Houston to Porto in June is currently the most expensive (average of $1,029). 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.

What is the cheapest time of day to fly from HOU to OPO?

Find hourly flight availability from Houston to Porto. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated August 14, 2025.

Unlike at noon, when flights are generally more expensive, you can save up to 27% on flights from Houston to Porto by exploring options for tickets in the afternoon.

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 14, 2025.
Peruse reviews from past customers who have flown with KLM, United Airlines, and Lufthansa from Houston to Porto to help guide your decision. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Crew

8.4

Overall

7.8

Entertainment

7.1

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,381 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Crew

8.4

Overall

7.8

Entertainment

7.1

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
United Airlines
7.4
Good
8,916 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Crew

8.4

Overall

7.8

Entertainment

7.1

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
Lufthansa
6.8
Okay
7,317 reviews
KLM
7.8
Good
1,381 reviews

Boarding

7.8

Comfort

7.7

Crew

8.4

Overall

7.8

Entertainment

7.1

Food

7.3

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

Related info for your journey

Find useful and relevant information for your journey from Houston to Porto. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly into for flights to Porto from Houston?

    If you book a flight to Porto from Houston, you will be flying to Porto, which is the city’s only airport. Porto (OPO) is located 6.8 mi from the center of Porto. There are 0 flights from Houston to Porto per day from 3 different airlines.

  • What are the cheapest airlines flying from Houston to Porto round-trip?

    Flying on KLM is currently your cheapest option to Porto, with prices starting at $629. Additional round-trip tickets that might be worth considering are offered by United Airlines and Lufthansa, with the lowest prices starting at $662 and $679, respectively. These flights start at 44% lower than the current average price 3 months from now.

  • Can I find deals for flights from Houston to Porto that include hotel bookings?

    Yes. In addition to deals on Houston to Porto flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Houston to Porto?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Houston to Porto.

  • Can I find deals for business class flights from Houston to Porto?

    Yes. Cheapflights offers flight deals from Houston to Porto by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Houston to Porto?

    Currently, January is the cheapest month in which you can book a flight from Houston to Porto (average of $523). Flying from Houston to Porto in June is currently the most expensive (average of $1,029). 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.

See more FAQs

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Aveiro
Arcos de Valdevez
Coimbra

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Top 3 airlines flying from Houston to Porto

Discover the top 3 airlines that operate flights from Houston 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 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$629Average$1,158FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$662Average$1,032FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$679Average$1,404FlexibilityNo cancel feeOn-time76%

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