OPO

$390 Find Cheap Flights from Houston to Porto

This is the cheapest one-way flight price found by a KAYAK user in the last 72 hours by searching for a flight from Houston to Porto departing on 9/28. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

KAYAK searches hundreds of travel sites at once for deals on flights to Porto

 
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Houston to Porto, as well as popular online travel agencies
These are the airlines KAYAK users have selected most often from within our search results in flight searches from Houston to Porto, as well as popular online travel agencies
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Everything you should know

Cheapest round-trip
$712
Typical prices: $935-$706
Turkish Airlines
tir. 9/15tor. 9/24
IAH - OPO • 1 stop
Cheapest one-way
$390
Typical prices: $628-$769
KLM
man. 9/28
HOU - OPO • 2 stops
Top airlines
Cheapest • from $712 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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We hope you love your trip to Porto!
Flight Deals
Booking Insights
Flight Deals

Cheap Flights from Houston to Porto

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Houston to Porto that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Houston to Porto

tir., sep. 15 - tor., sep. 24
Turkish Airlines Logo
9:05 pm - 11:30 pm
IAH
-
OPO
20h 25m
1 stop
Turkish Airlines Logo
4:40 pm - 12:45 pm
OPO
-
IAH
26h 05m
1 stop
$712Turkish Airlines
ons., okt. 14 - ons., okt. 28
Multiple Airlines Logo
3:55 pm - 3:25 pm
IAH
-
OPO
17h 30m
1 stop
Multiple Airlines Logo
11:15 am - 2:30 pm
OPO
-
IAH
32h 15m
1 stop
$766Multiple Airlines
ons., okt. 14 - ons., okt. 28
Multiple Airlines Logo
3:25 pm - 10:30 am
IAH
-
OPO
13h 05m
2 stops
Multiple Airlines Logo
11:15 am - 2:30 pm
OPO
-
IAH
32h 15m
1 stop
$771Multiple Airlines
ons., okt. 14 - ons., okt. 28
Iberia Logo
6:19 pm - 4:00 pm
HOU
-
OPO
15h 41m
2 stops
Iberia Logo
8:40 pm - 12:23 pm
OPO
-
HOU
20h 43m
2 stops
$787Iberia
ons., okt. 14 - ons., okt. 28
American Airlines Logo
6:50 pm - 4:00 pm
IAH
-
OPO
15h 10m
2 stops
American Airlines Logo
8:40 pm - 1:19 pm
OPO
-
IAH
21h 39m
2 stops
$787American Airlines
lør., okt. 17 - tor., okt. 22
British Airways Logo
7:50 pm - 8:35 pm
IAH
-
OPO
42h 45m
2 stops
British Airways Logo
8:20 am - 11:59 pm
OPO
-
IAH
21h 39m
2 stops
$814British Airways
fre., okt. 16 - man., okt. 19
KLM Logo
12:55 pm - 10:30 am
IAH
-
OPO
15h 35m
1 stop
KLM Logo
4:20 pm - 1:15 pm
OPO
-
IAH
26h 55m
1 stop
$816KLM
lør., okt. 17 - tor., okt. 22
KLM Logo
1:15 pm - 10:20 am
IAH
-
OPO
15h 05m
2 stops
KLM Logo
7:10 pm - 1:15 pm
OPO
-
IAH
24h 05m
1 stop
$821KLM
fre., okt. 16 - ons., okt. 21
Iberia Logo
6:19 pm - 4:00 pm
HOU
-
OPO
15h 41m
2 stops
Iberia Logo
12:25 pm - 11:53 pm
OPO
-
HOU
17h 28m
2 stops
$837Iberia
tir., sep. 15 - tor., sep. 24
British Airways Logo
6:19 pm - 7:30 pm
HOU
-
OPO
19h 11m
2 stops
British Airways Logo
8:20 am - 11:53 pm
OPO
-
HOU
21h 33m
2 stops
$1,008British Airways
Booking Insights

KAYAK's insights & trends for Houston to Porto flights

Get data-powered insights and trends into flights from Houston to Porto to help you find the cheapest flights, the best time to fly and much more.

How much is a round-trip flight from Houston to Porto?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Houston to Porto departing in September.

What is the cheapest month to fly from Houston to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Houston to Porto, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Houston to Porto is February, where tickets cost $550 (return) on average. On the other hand, the most expensive months are July and May, where the average cost of round-trip tickets is $1,330 and $1,312 respectively.

Good to know

Cheapest flight$390
Flight from Houston Hobby Airport to Porto

When to book flights from Houston to Porto

Are your dates flexible? Find out the best times to travel from Houston to Porto based on our flight data from the last year. Discover the cheapest month and even day to fly.
Estimated round-trip price
KAYAK looks at all historical flight data for each date to provide a predicted price for one-way trips or round-trips with a duration up to 40 days. While we try to provide actual minimum prices for each date, some prices are predictions and actual prices may differ.

FAQs for booking flights from Houston to Porto

  • What is the cheapest flight from Houston to Porto?

    In the last 3 days, the lowest price for a flight from Houston to Porto was $390 for a one-way ticket and $712 for a round-trip.

  • Do I need a passport to fly between Houston and Porto?

    A passport is required to fly from Houston to Porto.

  • Which airports will I be using when flying from Houston to Porto?

    There are 2 airports in Houston (Houston Hobby and Houston George Bush Intcntl.) and only 1 airport in Porto (Porto). The cheapest flights are generally found on the Houston Hobby Airport to Porto flight route.

  • Which aircraft models fly most regularly from Houston to Porto?

    We unfortunately don’t have that data for this specific route.

  • Which airline alliances offer flights from Houston to Porto?

    SkyTeam, and Star Alliance are the airline alliances operating flights between Houston and Porto, with SkyTeam being the most commonly used for this route.

  • How does KAYAK find such low prices on flights from Houston to Porto?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Houston to Porto.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Houston to Porto?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Houston is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Houston to Porto?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly to Porto with an airline and back to Houston with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Houston to Porto?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying to Porto from Houston up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top 3 airlines serving from Houston to Porto

 
See real verified KAYAK customer reviews for airlines flying from Houston to Porto. Airline scores are aggregated from all reviews left by passengers on KAYAK after flying with an airline. KAYAK doesn’t show reviews that are older than 5 years. Learn how KAYAK collects reviews.
Need help choosing which airline to fly with from Houston to Porto? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.8
KLMOverall score based on 1508 reviews
8.4Crew
7.8Boarding
7.7Comfort
7.3Food
7.1Entertainment
Airline reviews

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

10.0 ExcellentDiane, Apr 2026
AMS - HUY
Read more KLM reviews

As per usual when you Hit the UK it's a slow process through customs Not as efficient at Thailand for sure

It was really nice experience by flying this klm flight.I personally recommend everyone to please try this klm flight

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

Terrible last row seats many seats available but no offer to move to better seat

Delay on my previous leg, had to run to catch my flight. But that happens. Overall ok.

Delay and had to run between flight to get my connection due to this delay but besides that the overall experience was ok. I arrived with just an hour of delay.

At the airport, terrible, I do not want to even remember it. It was too humiliating for a business class passenger.

Flight was ok but lack of communication cost me to literally beg to be put on another flight as connecting flight had departed

They forgot to serve food and the crew was very unfriendly. Never experienced such a bad KLM flight. Usually fly from Toronto. New York was different.

The immigration hall in Amsterdam was understaffed, so passport checking was slower than it should be for a major airport. They need to get the automatic readers up and running for non EU passport holders. Waiting in line after a long flight feels a bit abusive.

It's a long flight and I would have liked better snacks between lunch and the arrival meal. It's fine to have fruit and nuts but I really don't like ramen because it's salty junk soup. I'd suggest sandwiches. They're not expensive nor are they hard to store for a long flight. The FA's had a couple of big services and they were super busy preparing, executing and then cleaning up. Then they disappeared.

Great flight. Got to watch a movie. Smooth flight and early arrival at ORD.

I've been flying American mostly, and it's been very frustrating. This united flight makes me realize maybe the issue isn't flying, but the airline. United was a significantly better experience. The plane was more comfortable, with a normal amount of leg room (vs the ridiculous reductions AA has made), more comfortable seats, screens to watch movies. It was a much better experience!

We had excellent customer service despite the chaos at George Bush airport in Houston!

It isvvery small flight. No leg room . No space to put my personal item at feet.

Didn't make the flight because the first leg of my flight was canceled and the next leg was already booked.

Terrible because it was cancelled due to volcanic ash clouds in Guatemala while all other airlines kept flying. Had to pay for a hotel to stay overnight in Houston and try to fly next day.

Overall we had a good experience during our flight from San Francisco to Houston.

Airport terminal was outdated, flight was on a small jet with no wifi

The crew made our experience extremely bad. They were rude and didn’t have anything for kids.

Boarding was disorganized. The door to one to the toilets wouldn’t lock. The plane was shockingly cramped, and clearly used for domestic flights due to the menus for items to sell domestic travelers. United should be ashamed of its small seats, tiny unclean toilets, and money grubbing stance toward services, compared to Lufthansa, Emirates, and most international carriers United is awful.

Was never allowed on and not refunded the full amount of the ticket plus charged a $300 processing fee.

Terrible. Lost our luggage for 4 days. Did not advise passengers there was a strike in Barcelona Airport and had zero personnel on hand at airport to advise passengers on where to go to file claims. We had to fend for ourselves. No assistance at all other than an online claims submission process that we had to find out about on our own.

Lufthansa cancelled our flight from Los Angeles to Naples Italy on March 10 for scheduled flight on March 12 Very stressful experience trying to arrange alternatives. Will never fly again with Lufthansa

Everything could have been better. What needed to be wrong with United went wrong

The staff was bit rude when I asked for an extra drink after one beer, asked for one wine glass.

Very good, i got two seats for myself, and was comfortable with the blanket i got

I hated the FRA Airport. Confusing signage, including the path to Immigration and Security It seems that the airport grew haphazardly over the years. I have been through multiple WW Hubs with much better experiences.

Economy Priority seats are extremely uncomfortable. There is no way to escape the boxed in feeling, particularely because the distance between to rows are too short, the hard edge of the front row is keeping legs confined. There is no elevated place to put your feet. I am of average, European size.

Terrible. Both flights were significantly delayed, no luggage, made me check my small bag when many, many others had much larger carry-ons, not even a bottle of water . . . I will not fly Discover Airlines again.

Everything you need to know for your flight from Houston to Porto

Information on your arrival and departure airports