OPO

$470 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, 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
$544
United Airlines
Mon 2/23Wed 3/11
IAH - OPO • 2 stops
Cheapest one-way
$470
United Airlines
Tue 3/3
IAH - OPO • 2 stops
Top airlines
United Airlines
Cheapest • from $544 (round-trip)
KLM
Best reviews • 7.7 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

Mon, Feb 23 - Wed, Mar 11
United Airlines Logo
11:55 am - 9:30 am
IAH
-
OPO
15h 35m2 stops
United Airlines Logo
6:00 am - 7:15 pm
OPO
-
IAH
18h 15m1 stop
$544United Airlines
Tue, Feb 10 - Mon, Feb 16
KLM Logo
4:05 pm - 10:30 am
IAH
-
OPO
12h 25m1 stop
KLM Logo
4:10 pm - 1:30 pm
OPO
-
IAH
27h 20m1 stop
$550KLM
Tue, Mar 3 - Thu, Mar 12
Delta Logo
9:54 am - 10:30 am
IAH
-
OPO
18h 36m2 stops
Delta Logo
5:00 am - 2:30 pm
OPO
-
IAH
14h 30m1 stop
$555Delta
Tue, Mar 3 - Thu, Mar 12
KLM Logo
3:30 pm - 10:30 am
IAH
-
OPO
13h 00m1 stop
KLM Logo
5:00 am - 2:30 pm
OPO
-
IAH
14h 30m1 stop
$556KLM
Tue, Mar 3 - Thu, Mar 12
United Airlines Logo
9:49 am - 9:30 am
IAH
-
OPO
17h 41m2 stops
United Airlines Logo
6:00 am - 9:22 pm
OPO
-
IAH
20h 22m2 stops
$563United Airlines
Mon, Feb 23 - Wed, Mar 11
Delta Logo
10:50 am - 10:30 am
HOU
-
OPO
17h 40m2 stops
Delta Logo
11:15 am - 10:39 am
OPO
-
HOU
28h 24m2 stops
$565Delta
Tue, Feb 10 - Mon, Feb 16
American Airlines Logo
10:35 am - 7:40 am
HOU
-
OPO
15h 05m2 stops
American Airlines Logo
8:40 pm - 9:43 am
OPO
-
HOU
19h 03m2 stops
$581American Airlines
Sun, May 3 - Tue, Jun 2
American Airlines Logo
4:19 pm - 4:00 pm
HOU
-
OPO
17h 41m2 stops
American Airlines Logo
12:25 pm - 11:52 pm
OPO
-
HOU
17h 27m2 stops
$787American Airlines
Sat, Feb 14 - Sat, Feb 21
Iberia Logo
10:15 am - 7:40 am
HOU
-
OPO
15h 25m2 stops
Iberia Logo
8:40 pm - 9:43 am
OPO
-
HOU
19h 03m2 stops
$847Iberia
Mon, May 11 - Mon, Jun 1
Iberia Logo
6:31 pm - 8:00 pm
HOU
-
OPO
19h 29m2 stops
Iberia Logo
12:25 pm - 11:52 pm
OPO
-
HOU
17h 27m2 stops
$1,041Iberia
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 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 $593 (return) on average. On the other hand, the most expensive months are June and February, where the average cost of round-trip tickets is $1,430 and $1,419 respectively.

Good to know

Cheapest flight$470
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 $470 for a one-way ticket and $544 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?

    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.
7.7
KLMOverall score based on 1435 reviews
8.4Crew
7.6Comfort
7.2Food
7.7Boarding
7.1Entertainment
Airline reviews

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

4.0 OkayShereen, Dec 2025
Read more KLM reviews

I’m grateful for the KLM Air France shuttle bus service to Ottawa. However due to construction and other issues related to the chaotic Uber pickup system at YUL, it’s a challenge to find the Kelios bus service to Ottawa. The signs are not clear or even available. No staff to guide passengers. It’s a stressful experience.

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

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.

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!

Unbelievably poor service from flight attendants. They didn’t even do water service on a four hour flight. Just disrespectful.

Seats had less pitch than a regional jet. Food was OK. Have to buy alcohol on US based carriers flying international. Boarding was a mess. Did not have bags but overhead space was gone quick. Would like to see the airlines enforce the one bag over and one bag under policy

Lately I like the planes have been exceptionally filthy. There’s lines of dust and dirt all across the ceiling in the vents, and the cracks in between the seats are literally full of food. It’s definitely not the quality of service that I was used to with United. I’m also very disappointed with the Wi-Fi! All I wanna do is knock out a few work jobs while I’m trapped in my seat And it spools so bad. They did provide me with a refund, but the process of getting that refund is so complicated. It’s unfortunate.

Food was poorly timed and not good.. Hand held snacks, really. I kept asking for water and never got any. Service was rushed for a 7-hour flight.

Crew was excellent. This was a relatively long flight though and had very little leg room, and no entertainment.

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.

Crew was professional and great, flight was clean. However food was pathetic. I ordered a Hindu meal assuming no meat but they served chicken. Need to be very specific- Hindu meal should be categorize as Vegetarian - no meat or egg. Or it should be specific that we are serving meat.

Late flight Delays Poor service Poor staff Worst airline ever

Ground staff and cabin crew were excellent. Flight was perfectly on time. Zero issues.

Even after a delay, getting off the ground, thanks for keeping me safe, the airline made certain that my connecting flight was rebooked to get me to my final destination. It was actually rebooked twice, and my luggage still managed to meet me. The airline gave me a credit for food and beverage to be used at the airport vendors, regretfully, the credit did not transfer to my final boarding pass. Oh, well…

Trip was smooth, good drew, average meal, almost cold coffee. Excellent landing. Did not enjoy going down the stairs, walking to the gate, walking up the stairs, going a long walk to the exchange gate, and going down the stairs again to be bussed all the way where we originally landed to take our next flight! Over all an average experience. Thank you.

I booked extra leg room, due to seat neighbor i now consider extra shoulder and arm room as well. Seems like the seats shrink in width now The crew was very friendly and professional ( 100%). Food was good not great, breakfast was bad, a dry slice of bread would have been better. Facilities clean.

Luggage transfer in Chicago was not performed in time. I received my luggage at my destination two days later.

love the crews and my only problem was the delay at Frankfurt was very bad. I have travelled with Lufthansa for over 30 years now and this was cost me some planned business appointment

The flight delay made the connection a bit tight but that's outside the flight crew's control.

We just made it to our connecting flight. A long, long speed walk!

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

Information on your arrival and departure airports