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$337+ 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 5/3. Fares are subject to change and may not be available on all flights or dates of travel.
HOU — OPO
Mar 30 — Apr 61
Mon 3/30
Mon 4/6
1 adult, Economy
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Cheap 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 February 28, 2026.

This Delta deal was found by Cheapflights users on 2/24. 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 10/133:55 pm
IAH
-
OPO
1 stop17h 30m
Delta
Fri 10/305:00 am
OPO
-
IAH
1 stop14h 30m
Delta
Deal found 2/24$546
This KLM deal was found by Cheapflights users on 2/25. 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 4/123:50 pm
IAH
-
OPO
1 stop17h 35m
KLM
Mon 4/2711:25 am
OPO
-
IAH
1 stop31h 50m
KLM
Deal found 2/25$549
This Delta deal was found by Cheapflights users on 2/24. 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 10/1412:55 pm
IAH
-
OPO
2 stops20h 30m
Delta
Tue 10/275:00 am
OPO
-
IAH
1 stop14h 30m
Delta
Deal found 2/24$550
This Air France deal was found by Cheapflights users on 2/24. 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.
Sun 4/123:50 pm
IAH
-
OPO
1 stop17h 35m
Multiple Airlines
Mon 4/2711:25 am
OPO
-
IAH
1 stop31h 50m
Multiple Airlines
Deal found 2/24$552
This Delta deal was found by Cheapflights users on 2/24. 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 10/133:25 pm
IAH
-
OPO
2 stops18h 05m
Delta
Wed 10/285:00 am
OPO
-
IAH
1 stop14h 30m
Delta
Deal found 2/24$556
This Delta deal was found by Cheapflights users on 2/24. 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 10/1411:30 am
IAH
-
OPO
2 stops22h 00m
Delta
Fri 10/305:00 am
OPO
-
IAH
2 stops22h 04m
Delta
Deal found 2/24$565
This KLM deal was found by Cheapflights users on 2/24. 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.
Tue 10/133:55 pm
IAH
-
OPO
1 stop17h 30m
KLM
Mon 10/2611:25 am
OPO
-
IAH
1 stop32h 30m
KLM
Deal found 2/24$566
This Expedia deal was found by Cheapflights users on 2/24. 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.
Wed 10/146:20 pm
IAH
-
OPO
2 stops15h 40m
Iberia
Tue 10/278:20 am
OPO
-
IAH
2 stops19h 58m
Iberia
Deal found 2/24$567
This United Airlines deal was found by Cheapflights users on 2/25. 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 10/136:00 am
IAH
-
OPO
2 stops19h 00m
United Airlines
Thu 10/296:00 am
OPO
-
IAH
2 stops23h 30m
United Airlines
Deal found 2/25$569
This Delta deal was found by Cheapflights users on 2/24. 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 10/142:10 pm
IAH
-
OPO
2 stops19h 15m
Delta
Mon 10/2611:25 am
OPO
-
IAH
1 stop32h 30m
Delta
Deal found 2/24$570
This American Airlines deal was found by Cheapflights users on 2/25. 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.
Mon 4/64:20 pm
HOU
-
OPO
2 stops17h 40m
American Airlines
Wed 4/1512:25 pm
OPO
-
HOU
2 stops17h 22m
American Airlines
Deal found 2/25$620
This Gotogate deal was found by Cheapflights users on 2/24. 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.
Sun 4/128:21 pm
HOU
-
OPO
2 stops17h 59m
British Airways
Mon 4/2711:45 am
OPO
-
HOU
2 stops38h 06m
British Airways
Deal found 2/24$624

Find 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 February 28, 2026.

Round-trip from

$549
(KLM)

One-way from

$337
(Kiwi.com)

Popular in

May

Cheapest in

November

Average price

$984
From Houston to Porto
Search Deals
One-way flight from Houston to Porto
Search Deals
Highest demand for flights based on searches. 18% potential increase in price ($222 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($35 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in February 2026
Search Deals

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 February 28, 2026.
Use the filters below to find and compare flights from Houston to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 5/4

3:50 pm-3:25 pm

1 stop17h 35m

Porto

Mon 5/11

7:00 pm-1:15 pm

1 stop24h 15m

$619

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Sun 4/12

8:21 pm-8:20 pm

2 stops17h 59m

Porto

Mon 4/27

8:20 am-11:47 pm

2 stops21h 27m

$620

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 8/12

3:55 pm-3:25 pm

1 stop17h 30m

Porto

Tue 8/18

11:30 am-1:15 pm

1 stop31h 45m

$648

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 3/10

4:30 pm-3:25 pm

1 stop17h 55m

Porto

Thu 3/26

5:00 am-2:30 pm

1 stop14h 30m

$667

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 3/17

6:54 pm-3:25 pm

2 stops15h 31m

Porto

Sun 5/10

9:25 am-11:54 pm

2 stops20h 29m

$761

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Mon 3/9

5:22 pm-3:25 pm

2 stops17h 03m

Porto

Tue 3/17

11:15 am-10:23 am

2 stops28h 08m

$775

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sat 3/21

5:05 pm-10:30 am

1 stop12h 25m

Porto

Sat 4/4

11:45 am-11:59 pm

2 stops18h 14m

$814

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 8/12

2:35 pm-3:30 pm

2 stops18h 55m

Porto

Tue 8/18

6:15 am-6:17 pm

2 stops18h 02m

$833

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sat 7/25

12:00 pm-6:55 am

1 stop12h 55m

Porto

Tue 8/4

12:15 pm-1:06 pm

2 stops30h 51m

$834

HoustonPorto

HOU - OPO

HOUOPO

Houston Hobby

Sat 4/11

4:18 pm-4:00 pm

2 stops17h 42m

Porto

Sat 4/18

12:25 pm-11:47 pm

2 stops17h 22m

$837

Flights are sorted by cheapest round-trip flights first.

Deals found on 2/25

Showing 1-10 of 33 resultsSorted by cheapest first
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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, March is the cheapest month in which you can book a flight from Houston to Porto (average of $477). Flying from Houston to Porto in June is currently the most expensive (average of $1,226). 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.

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 February 28, 2026.
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
7.7
Good
1,461 reviews

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Comfort

7.6

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
KLM
7.7
Good
1,461 reviews
KLM
7.7
Good
1,461 reviews

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Comfort

7.6

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
United Airlines
7.4
Good
9,362 reviews
KLM
7.7
Good
1,461 reviews

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Comfort

7.6

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas
Lufthansa
6.8
Okay
7,817 reviews
KLM
7.7
Good
1,461 reviews

Crew

8.4

Overall

7.7

Boarding

7.8

Food

7.3

Comfort

7.6

Entertainment

7.1

Reviews

1 / 20
2.0
Mediocre

Anonymous,Feb 2026

EZE - SCL

It was a short trip The aeroplane was delay I arrived in Chile late and I lost my fly with Qantas

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.

  • How long is the flight from Houston to Porto?

    Airlines like KLM, British Airways, and Delta fly from Houston to Porto in about 15h 31m. The time it takes to get you to your destination can typically vary by up to 2h 28m. There are 4726 mi between Houston and Porto. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

  • 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 $476. Additional round-trip tickets that might be worth considering are offered by United Airlines and Lufthansa, with the lowest prices starting at $642 and $831, respectively. These flights start at 51% 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, March is the cheapest month in which you can book a flight from Houston to Porto (average of $477). Flying from Houston to Porto in June is currently the most expensive (average of $1,226). 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
Vila Nova de Gaia
Aveiro
Arcos de Valdevez
Coimbra

Browse thousands of different options on Cheapflights for your next trip

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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 February 28, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$476Average$810FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$642Average$1,014FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$831Average$1,404FlexibilityNo cancel feeOn-time76%

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