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Cheap flights from Houston to Porto from $518

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Houston to Porto departing on 10/31. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Find the cheapest flights from Houston to Porto

Cheap round-trip flights

Logo
4:50 pm - 1:15 pmIAH-OPO
14h 25m1 stop
Logo
6:00 am - 6:15 pmOPO-IAH
18h 15m1 stop
$597
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Wed, Dec 3 - Tue, Jan 20
Logo
6:02 am - 9:30 amIAH-OPO
21h 28m1 stop
Logo
12:30 pm - 2:35 pmOPO-IAH
32h 05m1 stop
$599
Find Deal
Sun, Nov 9 - Mon, Nov 17
United Airlines Logo
12:18 pm - 11:40 amIAH-OPO
17h 22m2 stops
United Airlines Logo
6:00 am - 6:15 pmOPO-IAH
18h 15m1 stop
$606United Airlines
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Wed, Dec 3 - Tue, Jan 20
Iberia Logo
12:15 pm - 11:45 amIAH-OPO
17h 30m2 stops
Iberia Logo
8:40 pm - 11:34 pmOPO-IAH
32h 54m2 stops
$608Iberia
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Wed, Dec 3 - Tue, Jan 20
United Airlines Logo
7:30 am - 9:30 amIAH-OPO
20h 00m2 stops
United Airlines Logo
12:30 pm - 6:43 pmOPO-IAH
36h 13m2 stops
$613United Airlines
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Sun, Nov 9 - Mon, Nov 17
Iberia Logo
7:25 am - 7:35 amIAH-OPO
18h 10m2 stops
Iberia Logo
8:15 am - 11:43 pmOPO-IAH
21h 28m2 stops
$688Iberia
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Tue, Oct 14 - Fri, Oct 24
Lufthansa Logo
5:00 pm - 11:40 amIAH-OPO
36h 40m2 stops
Lufthansa Logo
12:30 pm - 2:10 pmOPO-IAH
31h 40m1 stop
$709Lufthansa
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Sat, Jan 10 - Sun, Feb 15
Lufthansa Logo
4:30 pm - 10:25 pmIAH-OPO
23h 55m1 stop
Lufthansa Logo
6:15 am - 2:35 pmOPO-IAH
38h 20m2 stops
$728Lufthansa
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Thu, Nov 6 - Sun, Nov 9
KLM Logo
3:30 pm - 8:00 pmIAH-OPO
22h 30m1 stop
KLM Logo
6:30 am - 1:15 pmOPO-IAH
36h 45m1 stop
$787KLM
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Thu, Oct 9 - Thu, Oct 16
KLM Logo
3:30 pm - 8:00 pmIAH-OPO
22h 30m1 stop
KLM Logo
6:30 am - 9:09 pmOPO-IAH
20h 39m2 stops
$797KLM
Find Deal
Thu, Oct 9 - Thu, Oct 16

United Airlines flights from Houston to Porto

Our best United Airlines deals on Houston to Porto flight tickets
United Airlines
Dec 3
IAH12:18 pmHouston George Bush Intcntl
17h 22m
2 stops
OPO11:40 amPorto
Jan 20
OPO6:00 amPorto
18h 15m
1 stop
IAH6:15 pmHouston George Bush Intcntl
$606
Find similar
United Airlines
Nov 9
IAH7:30 amHouston George Bush Intcntl
20h 00m
2 stops
OPO9:30 amPorto
Nov 17
OPO12:30 pmPorto
36h 13m
2 stops
IAH6:43 pmHouston George Bush Intcntl
$613
Find similar
United Airlines
Nov 19
IAH2:38 pmHouston George Bush Intcntl
12h 52m
1 stop
OPO9:30 amPorto
Nov 23
OPO6:00 amPorto
20h 36m
2 stops
IAH8:36 pmHouston George Bush Intcntl
$639
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Turkish Airlines flights from Houston to Porto

Our best Turkish Airlines deals on Houston to Porto flight tickets
Turkish Airlines
Oct 14
IAH9:00 pmHouston George Bush Intcntl
36h 50m
1 stop
OPO3:50 pmPorto
Oct 24
OPO4:50 pmPorto
32h 15m
1 stop
IAH7:05 pmHouston George Bush Intcntl
$718
Find similar
Turkish Airlines
Oct 6
IAH2:25 pmHouston George Bush Intcntl
19h 25m
1 stop
OPO3:50 pmPorto
Oct 21
OPO4:50 pmPorto
32h 15m
1 stop
IAH7:05 pmHouston George Bush Intcntl
$720
Find similar
Turkish Airlines
Sep 25
IAH9:00 pmHouston George Bush Intcntl
36h 50m
1 stop
OPO3:50 pmPorto
Sep 30
OPO10:50 amPorto
38h 15m
1 stop
IAH7:05 pmHouston George Bush Intcntl
$724
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momondo 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, momondo users made 832,500 searches. Data last updated August 26, 2025.
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

Wed 12/3

4:50 pm-1:15 pm

1 stop14h 25m

Porto

Tue 1/20

6:00 am-6:15 pm

1 stop18h 15m

$597

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sun 11/9

6:02 am-9:30 am

1 stop21h 28m

Porto

Mon 11/17

12:30 pm-2:35 pm

1 stop32h 05m

$599

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 12/3

12:18 pm-11:40 am

2 stops17h 22m

Porto

Tue 1/20

6:00 am-6:15 pm

1 stop18h 15m

$606

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Wed 12/3

12:15 pm-11:45 am

2 stops17h 30m

Porto

Tue 1/20

8:40 pm-11:34 pm

2 stops32h 54m

$608

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sun 11/9

7:30 am-9:30 am

2 stops20h 00m

Porto

Mon 11/17

12:30 pm-6:43 pm

2 stops36h 13m

$613

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Tue 10/14

7:25 am-7:35 am

2 stops18h 10m

Porto

Fri 10/24

8:15 am-11:43 pm

2 stops21h 28m

$688

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Sat 1/10

5:00 pm-11:40 am

2 stops36h 40m

Porto

Sun 2/15

12:30 pm-2:10 pm

1 stop31h 40m

$709

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 11/6

4:30 pm-10:25 pm

1 stop23h 55m

Porto

Sun 11/9

6:15 am-2:35 pm

2 stops38h 20m

$728

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 10/9

3:30 pm-8:00 pm

1 stop22h 30m

Porto

Thu 10/16

6:30 am-1:15 pm

1 stop36h 45m

$787

HoustonPorto

IAH - OPO

IAHOPO

Houston George Bush Intcntl

Thu 10/9

3:30 pm-8:00 pm

1 stop22h 30m

Porto

Thu 10/16

6:30 am-9:09 pm

2 stops20h 39m

$797

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 19 resultsSorted by cheapest first
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See travel insights to Porto from

How to get the cheapest flight ticket from Houston to Porto

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest month to fly to Porto?

The month of November is, on average, the cheapest month to fly to Porto from Houston, with most prices found around $654. If you aren’t able to travel during the month of November, then book flights to Porto from Houston during March instead. Flights to Porto in March, while not as cheap as those in November, still average around $738.

What is the cheapest day to depart on your flight to Porto?

The cheapest day to depart on your flight to Porto is on a Wednesday when prices can be found for as low as $887. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Tuesday because tickets tend to average around $1,432. These prices are subject to change though, so be sure to set up a Price Alert for flights to Porto.

What is the cheapest time of day to depart on your flight to Porto?

In the afternoon is the cheapest time of day to fly from Houston to Porto when you can find flight prices for as low as $1,080. Flying to Porto in the afternoon is an ideal time because this is during off-peak travel hours. If you have a flexible travel schedule, then try to avoid flying at noon when prices are $1,403 on average. Flights to Porto from Houston at noon are generally more expensive because this time of day is more convenient for travelers’ schedules.

Cheap Houston to Porto flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Houston to Porto

Direct flights

None
There are no direct flights from Houston to Porto. There are no popular flight routes from Houston to Porto.
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  • How far is Houston to Porto by plane?

    A flight from Houston to Porto will travel around 4740.9 mi. A reasonable flight in good conditions will take 12h 52m.

  • When did momondo last update prices for flights from Houston to Porto Airport?

    Prices for flights from Houston to Porto Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Houston to Porto Airport?

  • How old do you have to be to fly from Houston to Porto Airport?

    Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Houston to Porto Airport.

  • What documentation or ID do you need to fly to Porto Airport?

    The travel and health documents you'll need for your trip to Porto Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Porto Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

Best airlines flying from Houston to Porto

Compare and see reviews for airlines that fly from Houston to Porto with momondo
Airline
Rating
Free Cancellation
Price
KLMPriceFrom $629Free CancellationRating
7.8
1,387 reviews
Search KLM flights
United AirlinesPriceFrom $662Free CancellationRating
7.4
8,943 reviews
Search United Airlines flights
LufthansaPriceFrom $679Free CancellationRating
6.8
7,359 reviews
Search Lufthansa flights

Traveling to a place near Porto?

Book flights to Porto if you plan to visit one of these locations
Vila Nova de Gaia
Aveiro
Coimbra
Braga
Matosinhos
Caminha
Guimarães
Lamego
Esposende
Chaves
Arcos de Valdevez
Espinho
Viseu
Ponte de Lima
Pinhao
Santa Maria da Feira
Curia
Penafiel
Mesao Frio
Baiao

Why use momondo?

Why should I use momondo to find a flight deal from Houston to Porto?

Finding the right flight to Porto from Houston is quick and easy when you have a range of options in front of you, from reputable agents and recognisable airlines. Options that can then be filtered down to find the best fit. That is what momondo does. We make finding flights to Porto quick and easy, saving you time and money.

Can I find flights from Houston to Porto with flexible booking policies on momondo?

Flights from Houston to Porto with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

How can momondo help me find flights from Houston to Porto?

momondo offers useful filters to help you find the right flight. Choose specific flight times, airports or even what payment method you prefer. We have numerous options to help you book your ideal flight from Houston to Porto.

I’m not ready to book a flight from Houston to Porto right now. Can momondo alert me if prices change?

Yes momondo offers price alerts on flights to Porto from Houston. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.

An easier way to manage your Porto trip

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