HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Portsmouth

$1,130+ Cheap flights from Detroit (DTT) to Portsmouth, England

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
DTT — LHR
Jan 19 — Jan 261
Mon 1/19
Mon 1/26
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Detroit to Portsmouth with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Detroit to Portsmouth

Cheapest flights from Detroit to Portsmouth
Explore the most affordable flight options available from Detroit to Portsmouth. Find the lowest fares from popular airlines and budget airlines, with prices last updated on December 20, 2025.

This Delta deal was found by Cheapflights users on 12/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:25 pmDTW - SOU
1 stop17h 35mDelta
Sun 12/286:05 pmSOU - DTW
1 stop28h 50mDelta
Deal found 12/19$1,130
This Air Canada deal was found by Cheapflights users on 12/19. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Air Canada is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 12/236:15 pmDTW - SOU
2 stops17h 45mMultiple Airlines
Sun 12/288:10 pmSOU - DTW
2 stops26h 25mMultiple Airlines
Deal found 12/19$6,575

Find flight deals from Detroit to Portsmouth

Keep the following information in mind while searching for Detroit to Portsmouth flight deals. Data was last updated December 20, 2025.

Most accurate provider

eDreams
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$6,403
(Air Canada)

Popular in

December

Cheapest in

October

Average price

$1,156
Provider with most accurate pricing for Detroit (DTT)-London (LON) flight deals.
Search Deals
Provider most trusted by Cheapflights users for Detroit (DTT)-London (LON) flights.
Search Deals
From Detroit (DTT) to Portsmouth
Search Deals
Highest demand for flights based on searches. 7% potential increase in price ($79 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($22 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in December 2025
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Detroit to Portsmouth 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 2,558,603 searches. Data last updated December 20, 2025.
Use the filters below to find and compare flights from Detroit to Portsmouth that are best for you.

Fly from

Detroit

Fly to

Portsmouth

Route

Depart

Return

Price

DetroitSouthampton

DTW - SOU

DTWSOU

Detroit Metropolitan Wayne County

Tue 12/23

6:25 pm-5:00 pm

1 stop17h 35m

Southampton Eastleigh

Sun 12/28

6:05 pm-5:55 pm

1 stop28h 50m

$1,130

DetroitSouthampton

DTW - SOU

DTWSOU

Detroit Metropolitan Wayne County

Tue 12/23

6:15 pm-5:00 pm

2 stops17h 45m

Southampton Eastleigh

Sun 12/28

8:10 pm-5:35 pm

2 stops26h 25m

$6,575

Flights are sorted by cheapest round-trip flights first.

Deals found on 12/19

Best time to book a flight from Detroit to Portsmouth

Have a flexible travel schedule? Discover the best time to fly to Portsmouth from Detroit with our price prediction graph.
Estimated round-trip 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 Detroit to Portsmouth

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

Currently, August is the cheapest month in which you can book a flight from Detroit to Portsmouth (average of $128). Flying from Detroit to Portsmouth in June is currently the most expensive (average of $670). 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 DTT to P0R?

Find hourly flight availability from Detroit to Portsmouth. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated December 20, 2025.

It’s optimal to fly from Detroit to Portsmouth in the morning. By choosing this option you can save up to 6% on the cost of your flight, compared to a flight in the afternoon.

What is the cheapest day to fly from Detroit to Portsmouth?

Use this chart to determine the cheapest time to fly round-trip from Detroit to Portsmouth. Price data was last updated on December 16, 2024.

Travelers seeking maximum savings on their Detroit to Portsmouth flight should consider departing on Friday evenings when fares are most often at their lowest. Thursday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Detroit to Portsmouth

Explore weekly flight availability from Detroit to Portsmouth. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated December 20, 2025.

The most flights from DTT to P0R are scheduled on a Monday (5 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

Related info for your journey

Find useful and relevant information for your journey from Detroit to Portsmouth. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Detroit to Portsmouth?

    Located just 0.6 mi from the city center, Detroit All airports is the airport most travelers will use when flying to Portsmouth from Detroit. Booking flights from All airports (DTT) to Portsmouth should be relatively easy as there are 0 daily outbound flights to Portsmouth from 13 different airlines.

  • How long is the flight from Detroit to Portsmouth?

    Departing from Detroit to Portsmouth will take you 17h 35m. There are 3733 mi between Detroit and Portsmouth.

  • What are the most reliable airlines from Detroit to Portsmouth?

    The top 3 most reliable airlines when flying from Detroit to Portsmouth are KLM (62%), Air France (62%) and Scandinavian Airlines (62%).

  • What are the cheapest flights from Detroit to Portsmouth?

    While on average a flight from Detroit to Portsmouth is generally $2,326, our data shows the cheapest flight currently is $345. When looking at the most popular route, (Detroit Metropolitan Wayne County - Southampton Eastleigh), you can expect to pay $997 for that flight.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Detroit to Portsmouth 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 Detroit to Portsmouth?

    Currently, August is the cheapest month in which you can book a flight from Detroit to Portsmouth (average of $128). Flying from Detroit to Portsmouth in June is currently the most expensive (average of $670). 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

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Detroit to Portsmouth

See prices for flight routes from nearby airports that may be better suited for you.
O'Hare Intl to Heathrow flights
O'Hare Intl to Gatwick flights
O'Hare Intl to London City flights
Detroit to Heathrow flights
O'Hare Intl to Stansted flights
Midway to Heathrow flights
O'Hare Intl to Luton flights
O'Hare Intl to Edinburgh flights
Detroit to Gatwick flights
Detroit to London City flights
O'Hare Intl to Manchester flights
Detroit to Edinburgh flights
Detroit to Stansted flights
Midway to Gatwick flights
Midway to Edinburgh flights
Midway to Manchester flights
Grand Rapids to Heathrow flights
Detroit to Manchester flights
Grand Rapids to Gatwick flights
Flint to Heathrow flights
O'Hare Intl to Leeds flights
South Bend to Heathrow flights
Grand Rapids to London City flights
Kalamazoo to Heathrow flights
Grand Rapids to Edinburgh flights
O'Hare Intl to Liverpool flights
O'Hare Intl to Southampton flights
O'Hare Intl to Birmingham flights
Midway to Stansted flights
Detroit to Luton flights
Flint to Manchester flights
O'Hare Intl to Newcastle upon Tyne flights
Detroit to Liverpool flights
O'Hare Intl to Bristol flights
Traverse City to Heathrow flights
Kalamazoo to Edinburgh flights
Bay City to Heathrow flights
Detroit to Leeds flights
Lansing to Heathrow flights
Midway to London City flights
Traverse City to London City flights
Detroit to Birmingham flights
Midway to Luton flights
Flint to London City flights
Midway to Birmingham flights
Grand Rapids to Manchester flights
Midway to Newcastle upon Tyne flights
Midway to Bristol flights
Marquette to Heathrow flights

Top 10 airlines flying from Detroit to Portsmouth

Discover the top 10 airlines that operate flights from Detroit to Portsmouth. 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 2,558,603 searches. Data last updated December 20, 2025.
AirlineCheapestAverageFlexibilityOn-time
Spirit AirlinesCheapest$60Average$130FlexibilityNo cancel feeOn-time65%
JetBlueCheapest$75Average$765FlexibilityNo cancel feeOn-time62%
IcelandairCheapest$509Average$644FlexibilityNo cancel feeOn-time76%
IberiaCheapest$510Average$807FlexibilityNo cancel feeOn-time77%
British AirwaysCheapest$525Average$795FlexibilityNo cancel feeOn-time70%
American AirlinesCheapest$543Average$796FlexibilityNo cancel feeOn-time71%
Scandinavian AirlinesCheapest$554Average$662FlexibilityNo cancel feeOn-time77%
Turkish AirlinesCheapest$581Average$716FlexibilityNo cancel feeOn-time77%
DeltaCheapest$711Average$1,148FlexibilityNo cancel feeOn-timeN/A
KLMCheapest$713Average$1,217FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.