IAH - OPO

$518 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 10/31. 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 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

Wed, Dec 3 - Tue, Jan 20
 Logo
4:50 pm - 1:15 pmIAH-OPO
14h 25m1 stop
 Logo
6:00 am - 6:15 pmOPO-IAH
18h 15m1 stop
Sun, Nov 9 - Mon, Nov 17
 Logo
6:02 am - 9:30 amIAH-OPO
21h 28m1 stop
 Logo
12:30 pm - 2:35 pmOPO-IAH
32h 05m1 stop
Wed, Dec 3 - Tue, Jan 20
United Airlines Logo
12:18 pm - 11:40 amIAH-OPO
17h 22m2 stops
United Airlines Logo
6:00 am - 6:15 pmOPO-IAH
18h 15m1 stop
$606United Airlines
Find Deal
Wed, Dec 3 - Tue, Jan 20
Iberia Logo
12:15 pm - 11:45 amIAH-OPO
17h 30m2 stops
Iberia Logo
8:40 pm - 11:34 pmOPO-IAH
32h 54m2 stops
$608Iberia
Find Deal
Sun, Nov 9 - Mon, Nov 17
United Airlines Logo
7:30 am - 9:30 amIAH-OPO
20h 00m2 stops
United Airlines Logo
12:30 pm - 6:43 pmOPO-IAH
36h 13m2 stops
$613United Airlines
Find Deal
Tue, Oct 14 - Fri, Oct 24
Iberia Logo
7:25 am - 7:35 amIAH-OPO
18h 10m2 stops
Iberia Logo
8:15 am - 11:43 pmOPO-IAH
21h 28m2 stops
$688Iberia
Find Deal
Sat, Jan 10 - Sun, Feb 15
Lufthansa Logo
5:00 pm - 11:40 amIAH-OPO
36h 40m2 stops
Lufthansa Logo
12:30 pm - 2:10 pmOPO-IAH
31h 40m1 stop
$709Lufthansa
Find Deal
Thu, Nov 6 - Sun, Nov 9
Lufthansa Logo
4:30 pm - 10:25 pmIAH-OPO
23h 55m1 stop
Lufthansa Logo
6:15 am - 2:35 pmOPO-IAH
38h 20m2 stops
$728Lufthansa
Find Deal
Thu, Oct 9 - Thu, Oct 16
KLM Logo
3:30 pm - 8:00 pmIAH-OPO
22h 30m1 stop
KLM Logo
6:30 am - 1:15 pmOPO-IAH
36h 45m1 stop
$787KLM
Find Deal
Thu, Oct 9 - Thu, Oct 16
KLM Logo
3:30 pm - 8:00 pmIAH-OPO
22h 30m1 stop
KLM Logo
6:30 am - 9:09 pmOPO-IAH
20h 39m2 stops
$797KLM
Find Deal
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.

What is the cheapest month to fly from Houston George Bush Intcntl Airport to Porto?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Houston George Bush Intcntl Airport 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 George Bush Intcntl Airport to Porto is March, where tickets cost $717 (return) on average. On the other hand, the most expensive months are June and December, where the average cost of round-trip tickets is $1,404 and $1,314 respectively.

Good to know

Low seasonFebruary
Cheapest flight$518
Best time to beat the crowds with an average 20% drop in price.
Most popular time to fly with an average 16% 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 $518 for a one-way ticket and $597 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?

    Star Alliance, oneworld, and SkyTeam are the airline alliances operating flights between Houston George Bush Airport and Porto, with Star Alliance 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 $1,005 and an overall rating of 7.8, KLM is the most popular choice. United Airlines is also a great choice for the route, with an average price of $1,174 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.
7.8
KLMOverall score based on 1387 reviews
7.7Comfort
8.4Crew
7.1Entertainment
7.3Food
7.8Boarding
Airline reviews

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.

2.0 MediocrePeter, Aug 2025SAN - AMS
Read more KLM reviews

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.

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.

Our first flight was delayed so we missed our connecting flight. However it was easy to book a later flight on their app.

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!

Klm start boarding while somw air issue in the plan

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 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!

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.

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.

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!

Booked Economy but it translated to economy light for Lufthansa so now we are stuck paying an extra $75 per person both ways for our checked bags. If I had known that, I would have never booked these tickets because it came out to be more than other options. The booking in the kayak side clearly says Economy and has a link to the inormation for Lufthansa which states Economy included a checked bag. Super annoyed about that.

The flight from Dulles to Munich was just okay. The seats were comfortable and extra foot room was noticeable in comfort plus. Disappointed in the booking in so much I requested an aisle seat and then was assigned a middle seat. The food was inedible. Movie choices were moderate. I usually fly Delta, but this WA flight was cheaper. Next time, I'll happily pay the extra to fly Delta.

Flight was late arriving. So, we left 25 min late. Pilot made some time up during the flight. Therefore, we arrived alittle past original time.

Food is too little (in volume) and too spicy.. There are no snacks in the back of the plane in between meals.

The seat I was stuck in was so unimaginably uncomfortable. I have never had that tight of a seat in my 20 years of flying. Even budget airlines give you more space.

We were upgraded to economy plus and everything was awesome!

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

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