OPO

$482 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 3/3. 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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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

Mon, Oct 27 - Wed, Nov 12
Multiple Airlines Logo
5:05 pm - 10:30 amIAH-OPO
12h 25m1 stop
Multiple Airlines Logo
11:15 am - 1:30 pmOPO-IAH
32h 15m1 stop
$585Multiple Airlines
Find Deal
Mon, Oct 27 - Wed, Nov 12
United Airlines Logo
1:31 pm - 9:30 amIAH-OPO
14h 59m1 stop
United Airlines Logo
12:35 pm - 12:29 amOPO-IAH
17h 54m2 stops
$586United Airlines
Find Deal
Wed, Oct 29 - Mon, Nov 3
Air France Logo
5:05 pm - 10:30 amIAH-OPO
12h 25m1 stop
Air France Logo
11:25 am - 1:55 pmOPO-IAH
32h 30m1 stop
$596Air France
Find Deal
Wed, Nov 12 - Sun, Nov 16
Delta Logo
3:30 pm - 10:25 pmIAH-OPO
24h 55m1 stop
Delta Logo
5:00 am - 1:30 pmOPO-IAH
14h 30m1 stop
$645Delta
Find Deal
Wed, Nov 12 - Sun, Nov 16
Delta Logo
12:35 pm - 10:30 amIAH-OPO
15h 55m2 stops
Delta Logo
11:15 am - 1:30 pmOPO-IAH
32h 15m1 stop
$650Delta
Find Deal
Fri, Oct 31 - Wed, Nov 5
KLM Logo
4:30 pm - 10:20 pmIAH-OPO
24h 50m1 stop
KLM Logo
11:15 am - 11:59 pmOPO-IAH
18h 44m2 stops
$655KLM
Find Deal
Fri, Mar 20 - Thu, Mar 26
Lufthansa Logo
8:06 pm - 10:25 pmIAH-OPO
21h 19m2 stops
Lufthansa Logo
6:00 am - 12:12 amOPO-IAH
23h 12m2 stops
$658Lufthansa
Find Deal
Fri, Oct 31 - Wed, Nov 5
Lufthansa Logo
6:36 pm - 11:40 pmIAH-OPO
24h 04m2 stops
Lufthansa Logo
1:45 pm - 2:35 pmOPO-IAH
30h 50m2 stops
$683Lufthansa
Find Deal
Thu, Feb 19 - Sun, Feb 22
KLM Logo
11:30 am - 10:25 amIAH-OPO
16h 55m2 stops
KLM Logo
11:15 am - 1:30 pmOPO-IAH
32h 15m1 stop
$688KLM
Find Deal
Tue, Oct 28 - Sun, Nov 2
Air France Logo
5:05 pm - 10:30 amIAH-OPO
12h 25m1 stop
Air France Logo
11:25 am - 1:55 pmOPO-IAH
32h 30m1 stop
$708Air France
Find Deal

Everything you should know

Top airlines
United Airlines
Cheapest • from $586 (round-trip)
KLM
Best reviews • 7.8 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
Cheapest round-trip
$585
Overall average: $701
Multiple Airlines
Mon 10/27Wed 11/12
IAH - OPO • 1 stop
Cheapest one-way
$482
American Airlines
Tue 3/3
HOU - OPO • 2 stops
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KAYAK searches 100s of sites at once to find you the best travel deals.
We hope you love your trip to Porto!
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.

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 $654 (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$482
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 $482 for a one-way ticket and $585 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?

    oneworld, 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 1387 reviews
8.4Crew
7.7Comfort
7.2Entertainment
7.3Food
7.8Boarding
Airline reviews

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.

10.0 ExcellentCameron, Sep 2025YYJ - YYC
Read more KLM reviews

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.

Over 1 Hr delay. No APU so no AC on ground. Plane was hot during boarding and then they closed the doors over 20 minutes before engine start so interior of plane was steamy hot and stuffy. Could have been helped by opening doors until ready to depart.

First of all we couldn’t check in online, then we learn at the airport we were on stand by for KLM’s mistake of overbooking. The seats were not comfy at all. Our luggage got lost.

Short flight so it was okay. Nice crew, all very pleasant and professional. We were near the back in row 27 so just as we got our drinks, we started our descent so had to drink very quickly!

KLM remains a quality flag carrier airline which maintains its standards whilst all their competitors are lowering theirs.

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

The newer screen was super cool and had the option to watch many different shows or movies. Crew was polite and helpful. However again, many children screaming bloody murder and kicking my seat, and parents doing nothing about it as usual.

Plane was crowded and even when we hit altitude, the plane was hot, not enough air flow.

Flight was delayed and missed my connection Lufthansa didn’t respond.

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.

Everything went smoothly and the staff was very kind. I’m glad I purchased the extra leg room for my long flight; it was totally worth it. We were served 2 meals for a 9 hour flight which I was not expecting and they were very tasty. I appreciated them being vegetarian. Customs line in Munich was long; I had a choice to have a 1 hr 40 min layover or 2 hr 40 min layover; I took the longer layover which I was thankful for because my flight was delayed 30 minutes and there’s a good chance I would have missed my connecting flight. This was my very first international flight and I would fly Discover again without hesitation. Thank you for taking good care of me!

I liked everything BUT the temperature. It was freezing and now I am sick.

I liked Quiet people around me. Crew could have helped people with overhead luggage so they aren't moving other peoples bags around and causing problems for people that had there bags there first

The flight and crew were good. The customer experience on the ground could have been better. We had to reschedule our flight because of a delay on the previous flight. The attendants working the desk in Washington DC were not helpful. They told us to scan a QR code and that would get us rebooked. Why couldn't two people standing at their computers do this? We had to chat with someone to get everything figured out. It was extremely confusing.

The plane was delayed by two hours in Chicago which led to us missing the next flight. Lufthansa rebooked the flight and booked us a hotel for the night in Frankfurt. The level of customer service and getting us taken care of was superb. The flight crew and the service on the ground was superb.

It was a short flight, everything was good with it.

Flight was delayed over one hour and I had to pay to select my seat, even though my booking supposedly had free selection (I paid extra for this at time of booking)

Stop charging for alcohol overseas flights and start taking cash again not everyone wants to pay with card if the person is bigger give him seat on the outside seats not the middle in between the people is common sense and mainly if you fly for Lufthansa provides the sam service and experience...

good entertainment package but rather small seats for business class

The male attendant has zero personality. It seemed like he was over worked or hated his job, not once did he smile or made any contact with the people on the plane. Strictly business and call it a day!

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

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