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$354+ Cheap flights from George Bush Intcntl (IAH) 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 8/24. Fares are subject to change and may not be available on all flights or dates of travel.
IAH — OPO
Aug 25 — Sep 11
Tue 8/25
Tue 9/1
1 adult, Economy
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Cheap flight deals from George Bush Intcntl to Porto

Cheapest flights from George Bush Intcntl to Porto
Explore the most affordable flight options available from George Bush Intcntl to Porto. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 26, 2026.

This Delta deal was found by Cheapflights users on 7/22. 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 10/203:55 pm
IAH
-
OPO
1 stop17h 30m
Delta
Fri 10/305:00 am
OPO
-
IAH
1 stop14h 05m
Delta
Deal found 7/22$769
This Delta deal was found by Cheapflights users on 7/22. 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 10/2512:55 pm
IAH
-
OPO
1 stop14h 10m
Delta
Tue 10/2711:15 am
OPO
-
IAH
1 stop31h 55m
Delta
Deal found 7/22$770
This Delta deal was found by Cheapflights users on 7/22. 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 10/213:25 pm
IAH
-
OPO
1 stop18h 05m
Delta
Fri 10/305:00 am
OPO
-
IAH
1 stop14h 05m
Delta
Deal found 7/22$773
This United deal was found by Cheapflights users on 7/22. 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 is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 12/274:10 pm
IAH
-
OPO
1 stop24h 15m
Multiple Airlines
Fri 1/86:00 am
OPO
-
IAH
1 stop18h 15m
Multiple Airlines
Deal found 7/22$783
This United Airlines deal was found by Cheapflights users on 7/22. 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 10/248:20 pm
IAH
-
OPO
1 stop32h 10m
United Airlines
Thu 10/296:00 am
OPO
-
IAH
2 stops23h 30m
United Airlines
Deal found 7/22$784
This KLM deal was found by Cheapflights users on 7/22. 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 10/215:50 pm
IAH
-
OPO
2 stops15h 40m
KLM
Tue 10/279:55 am
OPO
-
IAH
2 stops17h 20m
KLM
Deal found 7/22$788
This Expedia deal was found by Cheapflights users on 7/22. 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.
Sun 12/2712:00 pm
IAH
-
OPO
2 stops24h 30m
Air Canada
Fri 1/86:00 am
OPO
-
IAH
2 stops33h 05m
Air Canada
Deal found 7/22$789
This Delta deal was found by Cheapflights users on 7/22. 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 10/2112:10 pm
IAH
-
OPO
2 stops16h 20m
Delta
Thu 10/2910:00 am
OPO
-
IAH
2 stops18h 57m
Delta
Deal found 7/22$792
This KLM deal was found by Cheapflights users on 7/22. 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 10/215:50 pm
IAH
-
OPO
2 stops15h 40m
Multiple Airlines
Wed 10/285:55 am
OPO
-
IAH
2 stops20h 22m
Multiple Airlines
Deal found 7/22$795

Find flight deals from George Bush Intcntl to Porto

Discover tips and strategies to find the most affordable flight options for your journey from George Bush Intcntl (IAH) 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 July 26, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$713
(KLM)

One-way from

$354
(Kiwi.com)

Popular in

December

Cheapest in

March

Average price

$1,082
Provider with most accurate pricing for Houston George Bush Intcntl-Porto flight deals.
Search Deals
Provider most trusted by Cheapflights users for Houston George Bush Intcntl-Porto flights.
Search Deals
From Houston George Bush Intcntl to Porto
Search Deals
One-way flight from Houston George Bush Intcntl to Porto
Search Deals
Highest demand for flights based on searches. 17% potential increase in price ($234 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 8% potential price decrease ($86 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from George Bush Intcntl 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 July 26, 2026.
Use the filters below to find and compare flights from Houston George Bush Intcntl Airport to Porto that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sun 12/27

4:10 pm-10:25 pm

1 stop24h 15m

Porto

Fri 1/8

6:00 am-11:35 pm

2 stops23h 35m

$793

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 9/8

9:15 pm-3:40 pm

1 stop36h 25m

Porto

Tue 9/15

4:50 pm-7:20 pm

1 stop32h 30m

$836

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Fri 10/16

10:00 am-7:10 am

1 stop15h 10m

Porto

Tue 10/20

11:15 am-1:28 pm

2 stops32h 13m

$869

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Fri 10/16

10:00 am-7:10 am

1 stop15h 10m

Porto

Wed 10/21

11:20 am-11:41 am

2 stops30h 21m

$869

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 9/9

10:00 am-7:00 am

1 stop15h 00m

Porto

Wed 9/16

6:00 am-5:50 pm

1 stop17h 50m

$919

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 9/8

12:02 pm-6:15 am

1 stop12h 13m

Porto

Tue 9/15

12:15 pm-1:18 pm

2 stops31h 03m

$919

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 9/15

10:19 pm-7:00 am

2 stops26h 41m

Porto

Thu 9/24

11:50 am-2:53 pm

2 stops33h 03m

$922
Quickest round-trip

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 9/15

3:20 pm-3:25 pm

2 stops18h 05m

Porto

Thu 9/24

5:00 am-1:20 pm

1 stop14h 20m

$925
Cheapest one-way

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 9/23

8:44 pm-7:00 pm

3 stops40h 16m

$381

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 8/20

8:57 am-7:05 pm

2 stops28h 08m

$422

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/24

Showing 1-10 of 15 resultsSorted by cheapest first
1
2

Compare providers for flights from George Bush Intcntl 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 George Bush Intcntl to Porto in July.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy1 starTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*3 stars

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Houston George Bush Intcntl Airport-Porto flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Houston George Bush Intcntl Airport-Porto flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Houston George Bush Intcntl Airport-Porto flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Houston George Bush Intcntl Airport-Porto flights, Cheapflights users trust FlightHub the most. FlightHub 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 Houston George Bush Intcntl Airport-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 George Bush Intcntl to Porto

Have a flexible travel schedule? Discover the best time to fly to Porto from George Bush Intcntl 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 George Bush Intcntl Airport to Porto

How much does it cost to fly round-trip from Houston George Bush Intcntl Airport to Porto?

Airfare is below average for this route at the moment.

Houston George Bush Intcntl Airport to Porto flights typically cost between $956 and $1,332 in January.
The cheapest round-trip price found within the last 5 days was $713 on KLM (Jan 12-Jan 19).

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 July 26, 2026.
Read reviews from past customers who have flown KLM and United Airlines from Houston George Bush Intcntl Airport to Porto. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,547 reviews

Comfort

7.7

Boarding

7.8

Entertainment

7.2

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
KLM
7.8
Good
1,547 reviews
KLM
7.8
Good
1,547 reviews

Comfort

7.7

Boarding

7.8

Entertainment

7.2

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful
United Airlines
7.4
Good
10,041 reviews
KLM
7.8
Good
1,547 reviews

Comfort

7.7

Boarding

7.8

Entertainment

7.2

Food

7.3

Overall

7.8

Crew

8.4

Reviews

1 / 20
6.0
Good

Anonymous,Apr 2026

OKC - ATL

Flight was ok - difficult as I had seat next to bathroom.. Food awful

Related info for your journey

Find useful and relevant information for your journey from George Bush Intcntl 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 George Bush Intcntl?

    Most people fly into Porto (OPO) if they book a flight to Porto from Houston George Bush Intcntl. On average, Porto has 0 inbound flights from Houston George Bush Intcntl per day from 2 airlines. Porto is conveniently located just 6.8 mi from Porto’s city center.

  • How long is the flight from Houston George Bush Intcntl Airport to Porto?

    Departing from Houston George Bush Intcntl Airport to Porto will take you 15h 10m. There are 4726 mi between Houston George Bush Intcntl Airport and Porto. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from Houston George Bush Intcntl Airport to Porto round-trip?

    According to our current data, KLM ($476), and United Airlines ($661) offers the cheapest pricing from Houston George Bush Intcntl Airport to Porto. You may be able to fly from Houston George Bush Intcntl Airport to Porto for 56% less than the average price by searching for these airlines.

  • Can I find deals for flights from George Bush Intcntl to Porto that include hotel bookings?

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

  • How can I find direct flights from George Bush Intcntl to Porto?

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

  • Can I find deals for business class flights from George Bush Intcntl to Porto?

    Yes. Cheapflights offers flight deals from George Bush Intcntl 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.

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
Arcos de Valdevez
Coimbra
Aveiro

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Alternative routes for George Bush Intcntl to Porto

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Top 2 airlines flying from George Bush Intcntl to Porto

Discover the top 2 airlines that operate flights from George Bush Intcntl 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 July 26, 2026.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest$476Average$700FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$661Average$1,224FlexibilityNo cancel feeOn-time69%

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