IAH - OPO

$226 Find Cheap Flights from Houston George Bush Airport 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 George Bush Intcntl to Porto departing on 5/4. 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
$533
Multiple Airlines
Mon 3/2Wed 3/11
IAH - OPO • 1 stop
Cheapest one-way
$226
British Airways
Mon 5/4
IAH - OPO • 1 stop
Top airlines
Lufthansa
Cheapest • from $542 (round-trip)
KLM
Best reviews • 7.7 score
Airline reviews
Airline reviews
+1
+1
Airline reviews
Airline reviews
+1
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Flight Deals
Booking Insights
Flight Deals

Cheap Flights from George Bush Intcntl to Porto (IAH-OPO)

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from George Bush Intcntl 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 George Bush Intcntl to Porto

Mon, Mar 2 - Wed, Mar 11
Multiple Airlines Logo
4:30 pm - 2:55 pm
IAH
-
OPO
16h 25m
1 stop
Multiple Airlines Logo
6:00 am - 11:09 am
OPO
-
IAH
34h 09m
2 stops
$533Multiple Airlines
Mon, Mar 2 - Wed, Mar 11
Lufthansa Logo
4:30 pm - 11:40 am
IAH
-
OPO
13h 10m
1 stop
Lufthansa Logo
4:15 pm - 3:10 pm
OPO
-
IAH
27h 55m
1 stop
$542Lufthansa
Mon, Feb 23 - Wed, Mar 4
Multiple Airlines Logo
12:10 pm - 12:05 pm
IAH
-
OPO
17h 55m
2 stops
Multiple Airlines Logo
4:15 pm - 2:10 pm
OPO
-
IAH
27h 55m
1 stop
$546Multiple Airlines
Mon, Feb 23 - Wed, Mar 4
United Airlines Logo
1:25 pm - 9:30 am
IAH
-
OPO
14h 05m
1 stop
United Airlines Logo
6:00 am - 6:15 pm
OPO
-
IAH
18h 15m
1 stop
$548United Airlines
Tue, Feb 24 - Tue, Mar 3
Delta Logo
9:54 am - 10:30 am
IAH
-
OPO
18h 36m
2 stops
Delta Logo
5:00 am - 1:30 pm
OPO
-
IAH
14h 30m
1 stop
$555Delta
Mon, Mar 2 - Mon, Mar 9
KLM Logo
3:30 pm - 6:50 pm
IAH
-
OPO
21h 20m
1 stop
KLM Logo
4:10 pm - 2:30 pm
OPO
-
IAH
27h 20m
1 stop
$556KLM
Mon, Feb 23 - Wed, Mar 4
United Airlines Logo
8:30 am - 9:30 am
IAH
-
OPO
19h 00m
2 stops
United Airlines Logo
6:00 am - 7:08 pm
OPO
-
IAH
19h 08m
2 stops
$563United Airlines
Tue, Feb 24 - Tue, Mar 3
Delta Logo
12:15 pm - 10:30 am
IAH
-
OPO
16h 15m
2 stops
Delta Logo
5:00 am - 9:13 pm
OPO
-
IAH
22h 13m
2 stops
$565Delta
Tue, Feb 24 - Tue, Mar 3
United Airlines Logo
2:35 pm - 9:30 am
IAH
-
OPO
12h 55m
1 stop
United Airlines Logo
12:35 pm - 8:40 pm
OPO
-
IAH
14h 05m
1 stop
$567United Airlines
Tue, Mar 10 - Thu, Mar 26
KLM Logo
6:54 pm - 3:25 pm
IAH
-
OPO
15h 31m
2 stops
KLM Logo
11:20 am - 2:55 pm
OPO
-
IAH
32h 35m
1 stop
$579KLM
Booking Insights

KAYAK's insights & trends for George Bush Intcntl to Porto flights

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

Which airlines provide the cheapest flights from Houston George Bush Airport to Porto?

The cheapest round-trip price for the route for each airline clicked by KAYAK users in the last 72 hours.

In the past 3 days, the cheapest round-trip tickets from Houston George Bush Airport to Porto were found on Lufthansa ($542) and United Airlines ($548).

Good to know

Low seasonMarch
Cheapest flight$226
Best time to beat the crowds with an average 37% drop in price.
Most popular time to fly with an average 4% increase in price.
Flight from Houston George Bush Airport to Porto

When to book flights from George Bush Intcntl to Porto

Are your dates flexible? Find out the best times to travel from George Bush Intcntl 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 Houston George Bush Airport to Porto flights

  • What is the cheapest flight from Houston George Bush Intcntl Airport to Porto?

    In the last 3 days, the lowest price for a flight from Houston George Bush Intcntl Airport to Porto was $226 for a one-way ticket and $533 for a round-trip.

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

    A passport is required to fly from Houston George Bush Airport to Porto.

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

    Houston George Bush Airport and Porto are both served by 1 main airport. You will leave Houston George Bush Airport from Houston George Bush Intcntl and will be arriving at Porto.

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

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

  • Which airline alliances offer flights from Houston George Bush Airport to Porto?

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

  • Which is the best airline for flights from Houston to Porto, KLM or United Airlines?

    The two airlines most popular with KAYAK users for flights from Houston to Porto are KLM and United Airlines. With an average price for the route of $700 and an overall rating of 7.7, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,116 and an overall rating of 7.4.

  • How does KAYAK find such low prices on flights from Houston George Bush Airport 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 George Bush Airport to Porto.

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

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight to Porto from Houston George Bush Airport 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 George Bush Airport 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 George Bush Airport with another airline. Booking your flights between Houston George Bush Airport and OPO can sometimes prove cheaper using this method.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Houston George Bush Airport 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 George Bush Airport 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 George Bush Intcntl 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 George Bush Intcntl 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 1443 reviews
7.6Comfort
8.4Crew
7.8Boarding
7.1Entertainment
7.3Food
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.

Flight was on time, staff are friendly and helpful onboard.

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.

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.

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.

Ad experience - been flying many years with them but they are losing out to other carriers with their service and bagage / seating policy. My 2 12-yo kids were not placed with the parent. Absurdity.

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

I like flying first class, and United has a nice one

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.

Service and food were excellent. Incredibly friendly and competent staff. Flight was delayed over and hour and I had to run between terminals to get my connecting flight.

Missed it by a couple minutes and couldn’t find an alternative flight so had to spend the night in DC and after much shuffling from 1 airline to another managed to get a United to Frankfurt.

There were only 2 toilets and one of them did not work in business class. We are not allowed to cross classes so had to wait in line to use the toilets!! The entertainment touch display was finicky and did not work all the time.

We missed our flight. There was not enough time built into the layover to get through immigration, customs, bagclaim, bag rechecking, and the long trip to another terminal and gate. Kayak really screwed up. We took the bus up to Wisconsin and then were picked up in Brookfield by private car. It was lucky we didnt miss the last bus out.

I tried both on line and by calling the Customer Service line to arrange for a special meal as i have food intolerances. I was under the impression from your service representative that I was successful. I was not. I cannot eat spicy foods and get very ill if i eat bell peppers. I could not eat either menu choice and no special meal was actually ordered. ( your representative tried to order it for a flight that did not have meal service!!! - found this out later). Your wonderful cabin crew managed to put together a fruit, salad, roll and cheese tray for me so I had something to eat. WHY WOULD YOU SERVE SPICY FOOD, WITH NO MILDER OPTION,ON AN INTERNATIONAL FLIGHT???

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.

Everything you need to know for your flight from George Bush Intcntl to Porto

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