OPO

$238 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 9/22. 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

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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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

Wed, Nov 19 - Sun, Nov 23
United Airlines Logo
1:31 pm - 9:30 amIAH-OPO
13h 59m1 stop
United Airlines Logo
6:00 am - 8:36 pmOPO-IAH
20h 36m2 stops
$640United Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
United Airlines Logo
2:38 pm - 9:30 amIAH-OPO
12h 52m1 stop
United Airlines Logo
12:35 pm - 10:31 pmOPO-IAH
15h 56m1 stop
$643United Airlines
Find Deal
Wed, Nov 19 - Sun, Nov 23
United Airlines Logo
9:35 am - 9:30 amIAH-OPO
17h 55m2 stops
United Airlines Logo
6:00 am - 8:36 pmOPO-IAH
20h 36m2 stops
$644United Airlines
Find Deal
Wed, Nov 12 - Sun, Nov 16
Air Canada Logo
11:50 am - 12:05 pmIAH-OPO
18h 15m2 stops
Air Canada Logo
6:00 am - 6:38 pmOPO-IAH
42h 38m2 stops
$659Air Canada
Find Deal
Wed, Nov 12 - Sun, Nov 16
Air Canada Logo
11:50 am - 12:05 pmIAH-OPO
18h 15m2 stops
Air Canada Logo
6:00 am - 6:38 pmOPO-IAH
42h 38m2 stops
$660Air Canada
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Wed, Sep 17 - Mon, Sep 22
 Logo
12:00 pm - 10:00 amIAH-OPO
16h 00m2 stops
 Logo
9:20 am - 1:35 pmOPO-IAH
34h 15m3 stops
Wed, Nov 19 - Sun, Nov 23
Lufthansa Logo
4:30 pm - 3:25 pmIAH-OPO
16h 55m1 stop
Lufthansa Logo
6:00 am - 10:57 pmOPO-IAH
22h 57m2 stops
$696Lufthansa
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Wed, Sep 17 - Mon, Sep 22
 Logo
5:25 am - 3:45 pmIAH-OPO
28h 20m3 stops
 Logo
7:25 pm - 9:07 pmOPO-IAH
31h 42m3 stops
Wed, Nov 19 - Sun, Nov 23
Lufthansa Logo
6:36 pm - 10:25 pmIAH-OPO
21h 49m2 stops
Lufthansa Logo
6:00 am - 10:57 pmOPO-IAH
22h 57m2 stops
$700Lufthansa
Find Deal
Tue, Sep 30 - Wed, Oct 15
KLM Logo
6:37 pm - 3:35 pmHOU-OPO
14h 58m2 stops
KLM Logo
11:35 am - 11:00 pmOPO-HOU
17h 25m2 stops
$1,037KLM
Find Deal
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?

What’s the cheapest day of the week to fly from Houston to Porto?

The average price of all round-trip flights from Houston to Porto clicked on KAYAK for each day over the last 12 months.

When flying from Houston to Porto, you should consider leaving on a Tuesday and avoid Saturdays if you are looking for the best rates. For your return to Houston, you’ll find the best rates on Mondays and the most expensive ones on Tuesdays.

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 November, where tickets cost $718 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $1,752 and $1,545 respectively.

Good to know

Cheapest flight$238
Flight from Houston George Bush 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 $238 for a one-way ticket and $640 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 George Bush 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?

    Star Alliance, SkyTeam, and oneworld are the airline alliances operating flights between Houston and Porto, with Star Alliance 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 1383 reviews
7.7Comfort
7.8Boarding
7.3Food
8.4Crew
7.1Entertainment
Airline reviews

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

6.0 GoodSimon, Jul 2025STR - AMS
Read more KLM reviews

The baggage drop-off in Stuttgart is bad: after online check-in you cannot use the automated baggage drop off as indicated on the website. You can use the terminals but have to cue to 1 of three open and slowly working counters to drop the bags. took about 45 minutes wait time.

My flight was delayed by 6 hours then I missed BOTH of my connecting flights, I then had to stay in the AIRPORT at JFK because soooooo many people also suffered from missing flights and there was no hotels available. I would like to be compensated for this experience! I had to stay in the airport for over 16 hours!

The service was great. However the lounge only gets passing grade

I appreciate that KLM was proactive in informing me of the 2 hour delay which enabled me to replan my travel. It was a bit stressful not knowing whether my connection from Montreal to Ottawa was happening. But the ground and air crew did a good job at comforting and assuring me.

Cabin crew professional, polite and friendly, boarding was seemless, but come on KLM surely you can do better than a pack of cheesy biscuits as an inflight snack

Cabin crew were excellent, very proffesional, polite and friendly, in flight snack was underwhelming, a packet of cheese biscuits, im sure KLM could run to a sandwich!

Legroom not all it could be, especially when the seat in front is reclined. Otherwise it was good, food and beverage were nice.

This portion of the flight was through Indigo. A local carrier. So all economy seating. No real service some refreshments for purchase standard economy stuff.

You should not have to pay for WiFi in business class

Transfer at Amsterdam airport is very convenient and the airport is easy to navigate. Boarding was also quick and easy. Cabin crew were excellent and the meals were good, although lacking in options.

the delay for 3 hours was understandable due to weather conditions but the flight should’ve provided some on flight compensations or at least provide more food.

United could have one single once of customer service. No human United employee would help me with the invalid mileage plus number, they said I had to speak with the computer.

Overall it was good. I missed my connection but I was put on another flight.

Although the flight was delayed the crew and the flight itself were very good. Couldn't fault anything and after the disappointment of being abandoned in the US by BA it was a welcome relief to travel with United

Boarding experience was smooth. Flight attendants were friendly and helpful. Entertainment system on the Houston-Edmonton flight did not function for passengers on the left side of the aisle. On the bird's eye flight from Quito to Houston, they should not serve a meal. No one needs to eat after midnight and it is disturbing for those passengers trying to sleep.

Smooth flight. Boarding was chaotic. Could not hear the gate agent over the intercom. People were lined up in the wrong lines. Groups one and two were told to board through line one and group 3 through line 2. All very confusing. Once in the air, the flight was smooth. There was no entertainment option on this aircraft, even though it was a larger aircraft.

My suitcase was completed destroyed. The top part is broken and unusable now.

We boarded but then sat there waiting on some missed connection people to get on so we sat for about 15 minutes for that. Then we sat again because the passenger manifest was wrong and they had to figure it out before we could leave. That took about another 20 minutes or so. The crew was working hard to figure it out so it’s not their fault. It ended up being a system glitch where someone was upgraded to first class while another person was also in the same seat and it just created a mess that took a little while to figure out. They literally went to every person on the plane asking their names to see who was sitting in the wrong seat. I also hate the entertainment that must be watched on your phone or tablet. Just give us setback screens. It’s so much better. Almost every Delta flight has this now and it is so nice to have them. The crew did a great job. I have no complaints from them. They were very hard working, even with the mishap and a disgruntled passenger.

My priority checked bag was not loaded on the flight. I had to sit in baggage claim in Las Vegas for 2 1/2 hours waiting for the next flight. All baggage staff were very helpful, tracking showed it as scanned for loading. Nobody told me why it wasn't on my flight.

All male crew was just too woke for me. I felt like a sardine. I will never take a window seat or the rearmost seat again. I booked early and did not pay for seat selection and that was a mistake. The security at IAH was atrocious. I was violated and radiated as I was in a hurry to connect to my other flight. I may have lost items under the seat in front of me that I couldn't see nor bend over to look.

Insulting. Lufthansa flight from Munich to EWR had us getting our luggage when we were told in Florence that it would follow us to Indianapolis. It did not. Then very slow security in EWR caused me and three other passengers from Lufthansa flight from Munich to miss the boarding closure. Behind me were two elderly grandparents and their ten year old grandson. We were all refused entry on a plane to Indy that was still at the gate. The doors had not even closed inside the terminal yet. No apologies or compensation offered. Not even a meal voucher let alone a free hotel stay for our inconvenience. I m not sure what the other three passengers behind me did ( they were elderly with a grandson, recall), but I stated 12 hours overnight in a chilly EWR airport until next flight to Indy at 850 next morning.

The food could be better, more snacks. And have some plugs to chargue the phone.

The pasta in the evening meal was tasteless. Otherwise, the flight was okay.

Everything was really great just The aircraft was too old and sounded it will break during takeoff

Seating was average for a first class seat. It very modern. I expected better.

Flight was a little late. The crew was courteous, food ok

Bad! Disaster!! The LH419 was cancelled after 4 hrs on board with no AC and no toilets

Poor food on flight between Toronto and Stockholm Airport Toronto too crowded

Extremely pleased with the crew. Best flight attendants ever! Very friendly, genuinely caring and attentive.

Best flight attendants ever! Very customer and service oriented, courteous, professional and helpful.

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

Information on your arrival and departure airports

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