OPO

$275 Find Cheap Flights from Houston to Porto - Compare and Save

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 10/20. 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

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Everything you should know

Cheapest round-trip
$721
Typical prices: $642-$961
United Airlines
Mon 11/2Fri 11/6
IAH - OPO • 2 stops
Cheapest one-way
$275
Multiple Airlines
Tue 10/20
IAH - OPO • 3 stops
Top airlines
Cheapest • from $721 (round-trip)
Best reviews • 7.8 score
Airline reviews
Airline reviews
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Airline reviews
Airline reviews
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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, Nov 2 - Fri, Nov 6
United Airlines Logo
7:59 pm - 9:30 am
IAH
-
OPO
31h 31m
2 stops
United Airlines Logo
6:00 am - 9:27 pm
OPO
-
IAH
21h 27m
2 stops
$721United Airlines
Mon, Nov 2 - Fri, Nov 6
United Airlines Logo
4:10 pm - 11:45 am
IAH
-
OPO
13h 35m
1 stop
United Airlines Logo
6:00 am - 9:27 pm
OPO
-
IAH
21h 27m
2 stops
$731United Airlines
Tue, Oct 20 - Tue, Oct 27
Multiple Airlines Logo
10:00 am - 7:00 am
IAH
-
OPO
15h 00m
1 stop
Multiple Airlines Logo
12:35 pm - 3:00 pm
OPO
-
IAH
31h 25m
1 stop
$810Multiple Airlines
Tue, Oct 20 - Tue, Oct 27
Iberia Logo
11:18 am - 7:40 am
IAH
-
OPO
14h 22m
2 stops
Iberia Logo
8:20 am - 9:59 pm
OPO
-
IAH
18h 39m
2 stops
$813Iberia
Wed, Oct 21 - Wed, Oct 28
Iberia Logo
7:02 pm - 8:00 pm
IAH
-
OPO
18h 58m
2 stops
Iberia Logo
8:20 am - 11:47 pm
OPO
-
IAH
20h 27m
2 stops
$813Iberia
Fri, Oct 16 - Tue, Oct 20
United Airlines Logo
10:00 am - 7:10 am
IAH
-
OPO
15h 10m
1 stop
United Airlines Logo
11:15 am - 5:18 pm
OPO
-
IAH
36h 03m
2 stops
$864United Airlines
Fri, Oct 16 - Tue, Oct 20
United Airlines Logo
10:00 am - 7:10 am
IAH
-
OPO
15h 10m
1 stop
United Airlines Logo
11:15 am - 1:28 pm
OPO
-
IAH
32h 13m
2 stops
$864United Airlines
Fri, Oct 16 - Tue, Oct 20
KLM Logo
3:55 pm - 3:25 pm
IAH
-
OPO
17h 30m
1 stop
KLM Logo
5:00 am - 1:20 pm
OPO
-
IAH
14h 20m
1 stop
$867KLM
Fri, Oct 16 - Tue, Oct 20
KLM Logo
3:55 pm - 3:25 pm
IAH
-
OPO
17h 30m
1 stop
KLM Logo
5:00 am - 1:20 pm
OPO
-
IAH
14h 20m
1 stop
$872KLM
Sun, Sep 13 - Fri, Sep 25
KLM Logo
5:46 pm - 3:30 pm
IAH
-
OPO
15h 44m
2 stops
KLM Logo
5:00 am - 1:20 pm
OPO
-
IAH
14h 20m
1 stop
$930KLM
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?

This analysis is based on the cheapest round-trip price found on KAYAK in the last 12 months by searching for a flight from Houston to Porto departing in November.

Flight prices are below average for this route right now.

Flights to Porto from Houston usually cost between $760 and $1,439 in November.
The lowest price found in the past 5 days was $721 on United Airlines (Nov 2-Nov 6).

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 January, where tickets cost $682 (return) on average. On the other hand, the most expensive months are December and May, where the average cost of round-trip tickets is $1,345 and $1,302 respectively.

Good to know

Cheapest flight

$275
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 5 days, the lowest price for a flight from Houston to Porto was $275 for a one-way ticket and $721 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 airlines flying 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 1551 reviews
7.7Comfort
8.4Crew
7.3Food
7.8Boarding
7.2Entertainment
Airline reviews

I think I previously submitted my feedback about flight lead Katherine in a different field by mistake. Please see those comments. Comments for Hyd to AMS are it was good. The flight lead and service met expectations for satisfactory high quality service but the flight lead did not stand out as exceptional as did the leads on the other two flights so I don’t remember anything specific one way or the other besides the fact I was satisfied.

10.0 ExcellentEmily, Jul 2026
ORD - MSP
Read more KLM reviews

I think I previously submitted my feedback about flight lead Katherine in a different field by mistake. Please see those comments. Comments for Hyd to AMS are it was good. The flight lead and service met expectations for satisfactory high quality service but the flight lead did not stand out as exceptional as did the leads on the other two flights so I don’t remember anything specific one way or the other besides the fact I was satisfied.

Had to cancel and rebook, KLM connection was cancelled prior to departure, ended up flying to Munich on non-Delta carrier.

The crew were unprofessional with a racist element. I was physically abused as well from one of the crew members

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.

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!

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!

Overall very positive. Boarding was quick and organized. Cabin was clean and seats were reasonably comfortable. Cabin crew was excellent and the meals provided were also of good quality

This fight left ahead of time which meant it arrived early which was great. Staff were very professional, but as with all these Short hop Flights the food was a disappointing snack There was no entertainment on this flight, but I did not expect any

Seats were comfortable crew members support was very good but AVML ordered or selected by us needs a lot of improvement.

I’m an EP on AA every year for more than a decade but this was a very pleasant and surprising experience. Clean and sizable plane for HOU to CHI. 5 row first class. And excellent food in first class the steak option was really good. Your flight attendants even better. Seat 5A

The experience with United Airlines was excellent; however, the experience with Houston Intercontinental Airport (IAH) was horrible. Although our flight departed from Terminal B, we had to go through security in Terminal C and then get on a train for travel to Terminal B. Additionally, there was significant walking required to get to the boarding location.

Unbelievably smooth boarding at IAH and the flight attendants were top notch.

We flew business fares. Was amazing. However, the check in didn't offer business fares preboarding which is less hectic. 8/10 due to this. Staff compared to Canadian carriers go above and beyond. Would gladly fly United again.

Comfortable seating POS to IAH. Food options were satisfactory. Good seat from IAH to ANC. Food options could be better.

Always pretty good as far as I see it. Staff was friendly and process was quick to get on and off.

There could have been better food options in economy on the long 7hr trip from IAH to AM.

For the expense of first class, the seats could have been nicer and higher tier snacks would have been nice.

They delayed the flight 3 hours because it wasn't full they moved us to 5 different gates probably the worst airline ever not even spirit is this bad.

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.

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

Information on your arrival and departure airports