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$277+ 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 3/17. Fares are subject to change and may not be available on all flights or dates of travel.
HOU — OPO
Jan 28 — Feb 41
Wed 1/28
Wed 2/4
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 December 29, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 12/29. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2912:20 pmIAH - OPO
2 stops16h 55mSWISS
Tue 1/611:25 amOPO - IAH
2 stops33h 15mSWISS
Deal found 12/29$1,258
This KLM deal was found by Cheapflights users on 12/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/293:30 pmIAH - OPO
1 stop21h 10mKLM
Tue 1/65:00 amOPO - IAH
1 stop14h 30mKLM
Deal found 12/29$1,280
This KAYAK deal was found by Cheapflights users on 12/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/294:30 pmIAH - OPO
1 stop16h 25mMultiple Airlines
Tue 1/611:25 amOPO - IAH
2 stops33h 15mMultiple Airlines
Deal found 12/28$1,294
This KAYAK deal was found by Cheapflights users on 12/28. 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 KAYAK is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/299:05 pmIAH - OPO
1 stop30h 50mTurkish Airlines
Tue 1/64:10 pmOPO - IAH
1 stop33h 00mTurkish Airlines
Deal found 12/28$1,596
This Expedia deal was found by Cheapflights users on 12/29. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/309:52 amIAH - OPO
2 stops15h 48mMultiple Airlines
Thu 1/111:05 amOPO - IAH
2 stops33h 35mMultiple Airlines
Deal found 12/29$1,770
This Rumbo deal was found by Cheapflights users on 12/29. 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 Rumbo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/293:50 pmIAH - OPO
1 stop19h 45mMultiple Airlines
Fri 1/26:00 amOPO - IAH
2 stops43h 08mMultiple Airlines
Deal found 12/29$1,982
This oojo deal was found by Cheapflights users on 12/29. 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 oojo is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/301:35 pmIAH - OPO
1 stop16h 15mTAP AIR PORTUGAL
Thu 1/16:35 pmOPO - IAH
1 stop20h 13mTAP AIR PORTUGAL
Deal found 12/29$2,166
This KLM deal was found by Cheapflights users on 12/29. 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 KLM is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/306:40 pmHOU - OPO
2 stops14h 45mKLM
Thu 1/16:35 amOPO - HOU
2 stops19h 49mKLM
Deal found 12/29$2,264
This Delta deal was found by Cheapflights users on 12/29. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/2910:46 amHOU - OPO
2 stops17h 44mDelta
Fri 1/26:30 amOPO - HOU
2 stops22h 41mDelta
Deal found 12/29$2,888
This Air France deal was found by Cheapflights users on 12/28. 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.
Mon 12/2910:46 amHOU - OPO
2 stops17h 44mMultiple Airlines
Sun 1/45:00 amOPO - HOU
2 stops18h 50mMultiple Airlines
Deal found 12/28$12,899

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 December 29, 2025.

Round-trip from

$489
(KLM)

One-way from

$277
(Kiwi.com)

Popular in

June

Cheapest in

November

Average price

$981
From Houston to Porto
Search Deals
One-way flight from Houston to Porto
Search Deals
Highest demand for flights based on searches. 26% potential increase in price ($372 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($39 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
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 December 29, 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 4/22

3:50 pm-3:25 pm

1 stop17h 35m

Porto

Mon 4/27

7:00 pm-1:15 pm

1 stop24h 15m

$489

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 1/26

6:55 pm-2:55 pm

1 stop14h 00m

Porto

Tue 2/10

6:00 am-6:15 pm

1 stop18h 15m

$510

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 1/26

7:05 pm-11:15 am

2 stops34h 10m

Porto

Tue 2/10

6:00 am-6:15 pm

1 stop18h 15m

$518

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 1/26

12:10 pm-12:05 pm

2 stops17h 55m

Porto

Tue 2/10

6:00 am-9:44 pm

2 stops21h 44m

$530

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 5/5

3:50 pm-3:25 pm

1 stop17h 35m

Porto

Mon 5/18

7:00 pm-1:15 pm

1 stop24h 15m

$545

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 5/4

3:50 pm-10:30 pm

1 stop24h 40m

Porto

Mon 5/18

7:00 pm-1:15 pm

1 stop24h 15m

$546

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 2/11

4:05 pm-10:30 am

1 stop12h 25m

Porto

Mon 2/16

11:15 am-1:30 pm

1 stop32h 15m

$550

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Mon 1/26

4:05 pm-10:30 am

1 stop12h 25m

Porto

Tue 2/10

5:00 am-1:30 pm

1 stop14h 30m

$550

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 2/11

4:05 pm-10:30 am

1 stop12h 25m

Porto

Tue 2/17

5:00 am-1:30 pm

1 stop14h 30m

$550

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 2/11

4:05 pm-10:30 am

1 stop12h 25m

Porto

Mon 2/16

4:10 pm-1:30 pm

1 stop27h 20m

$550

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/28

Showing 1-10 of 38 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, November is the cheapest month in which you can book a flight from Houston to Porto (average of $562). Flying from Houston to Porto in February is currently the most expensive (average of $1,419). 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 December 29, 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
7.7
Good
1,435 reviews

Boarding

7.7

Crew

8.4

Food

7.2

Comfort

7.6

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
KLM
7.7
Good
1,435 reviews
KLM
7.7
Good
1,435 reviews

Boarding

7.7

Crew

8.4

Food

7.2

Comfort

7.6

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
United Airlines
7.4
Good
9,118 reviews
KLM
7.7
Good
1,435 reviews

Boarding

7.7

Crew

8.4

Food

7.2

Comfort

7.6

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle
Lufthansa
6.8
Okay
7,659 reviews
KLM
7.7
Good
1,435 reviews

Boarding

7.7

Crew

8.4

Food

7.2

Comfort

7.6

Entertainment

7.1

Overall

7.7

Reviews

1 / 20
8.0
Excellent

Anonymous,Dec 2025

YYC - AMS

Not literally sitting in the very last row in the middle

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, Lufthansa, and Air Canada fly from Houston to Porto in about 14h. The time it takes to get you to your destination can typically vary by up to 3h 55m. 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 $536. Additional round-trip tickets that might be worth considering are offered by United Airlines and Lufthansa, with the lowest prices starting at $642 and $679, respectively. These flights start at 47% 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, November is the cheapest month in which you can book a flight from Houston to Porto (average of $562). Flying from Houston to Porto in February is currently the most expensive (average of $1,419). 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
Vila Nova de Gaia

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 December 29, 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$536Average$868FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$642Average$1,014FlexibilityNo cancel feeOn-time69%
LufthansaCheapest$679Average$1,336FlexibilityNo cancel feeOn-time76%

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