Cheap flights from Portsmouth to Houston from £341

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 2/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — HOU
16 Oct — 23 Oct1
1 adult
1 adult, Economy

Cheap flight deals from Portsmouth to Houston

Keep the following information in mind while searching for Portsmouth to Houston flight deals. Data was last updated 16 September 2025.

Round-trip from

£715

One-way from

£341

Popular in

July

Cheapest in

March

Average price

£639
KLM
  • KLM
  • 1/10-23/10
  • 2 total stops
  • 53h 25m total
  • Portsmouth to Houston
2/10
  • 2/10
  • 2 total stops
  • 32h 43m total
  • Portsmouth to Houston
Highest demand for flights based on searches. 14% potential increase in price (£91 potential increase over avg. return price).
Cheapest flight prices on average. 2% potential price decrease (£15 potential savings vs. average return price).
Average for round-trip flights in September 2025

Find flight deals from Portsmouth to Houston

Cheapest flights from Portsmouth to Houston
Explore the most affordable flight options available from Portsmouth to Houston. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 16 September 2025.

Wed 1/1009:20SOU - IAH
1 stop33h 55mKLM
Thu 23/1015:30IAH - SOU
1 stop19h 30mKLM
Deal found 14/9£715
Wed 1/1017:35SOU - IAH
1 stop25h 40mDelta
Thu 23/1012:55IAH - SOU
2 stops22h 05mDelta
Deal found 14/9£716
Thu 2/1017:35SOU - IAH
1 stop25h 40mKLM
Thu 23/1009:42IAH - SOU
2 stops17h 03mKLM
Deal found 14/9£718
Wed 1/1009:20SOU - HOU
2 stops19h 17mDelta
Thu 23/1006:00HOU - SOU
2 stops20h 45mDelta
Deal found 14/9£720
Thu 2/1009:20SOU - HOU
2 stops19h 17mKLM
Thu 23/1010:13HOU - SOU
2 stops16h 32mKLM
Deal found 14/9£726
Mon 29/917:35SOU - IAH
1 stop25h 40mDelta
Wed 22/1015:30IAH - SOU
1 stop19h 30mDelta
Deal found 14/9£745
Mon 29/917:35SOU - IAH
1 stop25h 40mDelta
Thu 23/1013:29IAH - SOU
2 stops21h 31mDelta
Deal found 14/9£745
Wed 1/1017:35SOU - IAH
1 stop25h 40mKLM
Sat 25/1015:30IAH - SOU
1 stop12h 20mKLM
Deal found 14/9£748
Thu 2/1017:35SOU - IAH
1 stop25h 40mDelta
Fri 24/1010:50IAH - SOU
2 stops15h 55mDelta
Deal found 14/9£748
Tue 30/909:20SOU - IAH
2 stops16h 46mDelta
Wed 22/1011:49IAH - SOU
2 stops14h 56mDelta
Deal found 14/9£750
Wed 1/1009:20SOU - IAH
1 stop33h 55mKLM
Fri 24/1010:50IAH - SOU
2 stops15h 55mKLM
Deal found 14/9£751
Thu 2/1009:20SOU - HOU
2 stops19h 17mDelta
Fri 24/1006:00HOU - SOU
2 stops20h 45mDelta
Deal found 14/9£753

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Houston that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 September 2025.
Use the filters below to find and compare flights from Portsmouth to Houston that are best for you.

Fly from

Portsmouth

Fly to

Houston

Route

Depart

Return

Price

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Wed 1/10

09:20-13:15

1 stop33h 55m

Houston George Bush Intcntl

Thu 23/10

15:30-17:00

1 stop19h 30m

£715

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Wed 1/10

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Thu 23/10

12:55-17:00

2 stops22h 05m

£716

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Thu 2/10

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Thu 23/10

09:42-08:45

2 stops17h 03m

£718

SouthamptonHouston

SOU - HOU

SOUHOU

Southampton Eastleigh

Wed 1/10

09:20-22:37

2 stops19h 17m

Houston Hobby

Thu 23/10

06:00-08:45

2 stops20h 45m

£720

SouthamptonHouston

SOU - HOU

SOUHOU

Southampton Eastleigh

Thu 2/10

09:20-22:37

2 stops19h 17m

Houston Hobby

Thu 23/10

10:13-08:45

2 stops16h 32m

£726

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Thu 2/10

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Wed 22/10

15:30-17:00

1 stop19h 30m

£745

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Mon 29/9

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Wed 22/10

15:30-17:00

1 stop19h 30m

£745

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Mon 29/9

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Thu 23/10

15:30-17:00

1 stop19h 30m

£745

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Mon 29/9

17:35-13:15

1 stop25h 40m

Houston George Bush Intcntl

Tue 21/10

15:30-17:00

1 stop19h 30m

£745

SouthamptonHouston

SOU - IAH

SOUIAH

Southampton Eastleigh

Sun 5/10

18:25-13:15

1 stop24h 50m

Houston George Bush Intcntl

Wed 22/10

15:30-17:00

1 stop19h 30m

£745

Flights are sorted by cheapest return flights first.

Deals found on 14/9

Showing 1-10 of 37 results
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Best time to book a flight from Portsmouth to Houston

Have a flexible travel schedule? Discover the best time to fly to Houston from Portsmouth with our price prediction graph.
Estimated return price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Portsmouth to Houston

What is the cheapest month to book a flight from Portsmouth to Houston?

Currently, January is the cheapest month in which you can book a flight from Portsmouth to Houston (average of £765). Flying from Portsmouth to Houston in July is currently the most expensive (average of £1,114). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from P0R to HOU?

Find hourly flight availability from Portsmouth to Houston. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 16 September 2025.

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Portsmouth to Houston as you normally would.

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Houston. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.
  • How long is the flight from Portsmouth to Houston?

    A quick flight from Portsmouth to Houston can take about 25h 40m. KLM provides one of the quickest options available for as low as £716. Airlines will cover a distance of 4799 mi. This flight may include one or multiple stops.

  • Can I find deals for flights from Portsmouth to Houston that include hotel bookings?

    Yes. In addition to deals on Portsmouth to Houston flights, Cheapflights offers holiday packages that include both flights and hotel.

  • How can I find direct flights from Portsmouth to Houston?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Portsmouth to Houston.

  • Can I find deals for business class flights from Portsmouth to Houston?

    Yes. Cheapflights offers flight deals from Portsmouth to Houston by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Portsmouth to Houston?

    Currently, January is the cheapest month in which you can book a flight from Portsmouth to Houston (average of £765). Flying from Portsmouth to Houston in July is currently the most expensive (average of £1,114). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Portsmouth to Houston

See prices for flight routes from nearby airports that may be better suited for you.

Top 10 airlines flying from Portsmouth to Houston

Discover the top 10 airlines that operate flights from Portsmouth to Houston. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 858,174 searches. Data last updated 16 September 2025.
AirlineCheapestAverageFlexibilityOn-time
KLMCheapest£313Average£700FlexibilityNo cancel feeOn-time75%
Search KLM flights
WestJetCheapest£378Average£549FlexibilityNo cancel feeOn-time60%
Search WestJet flights
Virgin AtlanticCheapest£378Average£736FlexibilityNo cancel feeOn-time72%
Search Virgin Atlantic flights
IcelandairCheapest£440Average£638FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
JetBlueCheapest£450Average£572FlexibilityNo cancel feeOn-time62%
Search JetBlue flights
Scandinavian AirlinesCheapest£475Average£634FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
LufthansaCheapest£494Average£741FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
FinnairCheapest£500Average£628FlexibilityNo cancel feeOn-time76%
Search Finnair flights
Austrian AirlinesCheapest£508Average£792FlexibilityNo cancel feeOn-time78%
Search Austrian Airlines flights
IberiaCheapest£518Average£766FlexibilityNo cancel feeOn-time77%
Search Iberia flights

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How does Cheapflights help users find flights from Portsmouth to Houston?

Deals for Portsmouth to Houston flights are sourced from 900+ travel sites when you use Cheapflights. When all flight results come back, Cheapflights lets you sort and filter flights using different criteria to choose better, like price, airport, cabin class, and plenty of other options.

Why should you use Cheapflights to find cheap flight tickets from Portsmouth to Houston?

It’s simple! Cheapflights, which is free to use for everyone, saves millions of users time and money every year by helping them find the cheapest and most suitable flights from Portsmouth to Houston.

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Users can book flights with no change fees policies with our dedicated filters. Book flights from Portsmouth to Houston flexibly with Cheapflights today.

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