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Cheap flights from Portsmouth to Key Largo from £326

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 15/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
27 Feb — 6 Mar1
1 adult
1 adult, Economy, 0 bags

Cheap flight deals from Portsmouth to Key Largo

Enter your travel dates to find the best prices.

Cheapest flights from Portsmouth to Key Largo
Explore the most affordable flight options available from Portsmouth to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 28 January 2026.

Thu 12/318:05
SOU
-
MIA
1 stop25h 45m
KLM
Thu 19/311:23
MIA
-
SOU
2 stops16h 57m
KLM
Deal found 26/1£529
Wed 11/209:25
SOU
-
MIA
2 stops18h 21m
Delta
Thu 26/211:34
MIA
-
SOU
2 stops15h 46m
Delta
Deal found 27/1£533
Sun 15/217:45
SOU
-
MIA
2 stops36h 08m
Delta
Thu 26/216:50
MIA
-
SOU
1 stop19h 10m
Delta
Deal found 27/1£537
Wed 11/217:35
SOU
-
MIA
1 stop26h 15m
Delta
Mon 2/311:33
MIA
-
SOU
2 stops15h 47m
Delta
Deal found 27/1£558
Thu 12/209:00
SOU
-
MIA
2 stops29h 24m
Delta
Thu 26/207:40
MIA
-
SOU
2 stops19h 40m
Delta
Deal found 27/1£563
Wed 4/208:55
SOU
-
MIA
2 stops15h 35m
British Airways
Sun 8/219:55
MIA
-
SOU
1 stop14h 40m
British Airways
Deal found 25/1£566
Wed 11/208:55
SOU
-
MIA
2 stops15h 35m
British Airways
Fri 27/219:55
MIA
-
SOU
1 stop31h 50m
British Airways
Deal found 27/1£567
Thu 15/1008:55
SOU
-
MIA
2 stops16h 15m
British Airways
Wed 21/1017:00
MIA
-
SOU
2 stops18h 15m
British Airways
Deal found 26/1£590
Thu 15/1008:55
SOU
-
MIA
2 stops16h 15m
British Airways
Thu 22/1017:00
MIA
-
SOU
2 stops18h 15m
British Airways
Deal found 26/1£594
Mon 2/1117:30
SOU
-
MIA
1 stop26h 30m
Delta
Mon 9/1112:01
MIA
-
SOU
2 stops23h 59m
Delta
Deal found 26/1£610

Find flight deals from Portsmouth to Key Largo

Keep the following information in mind while searching for Portsmouth to Key Largo flight deals. Data was last updated 28 January 2026.

Round-trip from

£529

One-way from

£326

Popular in

October

Cheapest in

June

Average price

£673
KLM
  • KLM
  • 12/3-19/3
  • 3 total stops
  • 42h 42m total
  • Portsmouth to Key Largo
Search Deals
15/6
  • 15/6
  • 2 total stops
  • 53h 25m total
  • Portsmouth to Key Largo
Search Deals
Highest demand for flights based on searches. 29% potential increase in price (£287 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 10% potential price decrease (£68 potential savings vs. average return price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customise your flight search to find flights from Portsmouth to Key Largo 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 28 January 2026.
Use the filters below to find and compare flights from Portsmouth to Key Largo that are best for you.

Fly from

Portsmouth

Fly to

Key Largo

Route

Depart

Return

Price

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 12/3

08:50-22:26

2 stops17h 36m

Miami

Thu 19/3

11:23-08:20

2 stops16h 57m

£532

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Wed 11/2

09:25-00:51

2 stops20h 26m

Miami

Mon 2/3

11:33-08:20

2 stops15h 47m

£533

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Wed 11/2

09:25-22:46

2 stops18h 21m

Miami

Thu 26/2

11:34-08:20

2 stops15h 46m

£533

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 15/2

17:45-00:53

2 stops36h 08m

Miami

Mon 2/3

11:33-08:20

2 stops15h 47m

£533

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 15/2

17:45-00:53

2 stops36h 08m

Miami

Thu 26/2

11:34-08:20

2 stops15h 46m

£533

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 12/3

18:05-18:54

2 stops28h 49m

Miami

Thu 19/3

11:23-08:20

2 stops16h 57m

£537

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 12/2

09:00-09:24

2 stops29h 24m

Miami

Mon 2/3

11:34-08:20

2 stops15h 46m

£563

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sat 7/3

09:25-23:20

2 stops18h 55m

Miami

Sat 14/3

17:40-08:20

2 stops34h 40m

£613

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 27/4

19:55-14:30

2 stops23h 35m

Miami

Mon 18/5

22:40-19:25

2 stops15h 45m

£646

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 15/6

19:20-19:45

2 stops53h 25m

£326

Flights are sorted by cheapest return flights first.

Deals found on 27/1

Showing 1-10 of 15 results
1
2

Best time to book a flight from Portsmouth to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo 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 Key Largo

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

Currently, May is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £224). Flying from Portsmouth to Key Largo in July is currently the most expensive (average of £343). 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 KE9?

Find hourly flight availability from Portsmouth to Key Largo. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 28 January 2026.

When flying from Portsmouth to Key Largo, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Portsmouth to Key Largo

Explore weekly flight availability from Portsmouth to Key Largo. 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 28 January 2026.

The most flights from P0R to KE9 are scheduled on a Monday (23 on average). You will have fewer flight options on Wednesday, which is when the least amount of flights are scheduled (14 on average).

How much does it cost for a return flight from Portsmouth to Key Largo?

Related info for your journey

Find useful and relevant information for your journey from Portsmouth to Key Largo. 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 Key Largo?

    There are many flights that can get you from Portsmouth to Key Largo in 17h 36m. Fly via KLM or Delta to get the fastest option. The distance from Portsmouth to Key Largo is about 4381 mi. Both multi-stop and direct flights can be found to your destination and back.

  • What are the most reliable airlines from Portsmouth to Key Largo?

    The top 3 most reliable airlines when flying from Portsmouth to Key Largo are Malaysia Airlines (89%), KLM (81%) and Air France (81%).

  • What are the cheapest flights from Portsmouth to Key Largo?

    Looking at all options, your cheapest flight can be booked for £346. While the most popular route (Southampton Eastleigh - Miami) can be booked for £529 on average, our data indicates £1,567 when flying from Portsmouth to Key Largo.

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

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

  • How can I find direct flights from Portsmouth to Key Largo?

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

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

    Yes. Cheapflights offers flight deals from Portsmouth to Key Largo 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 Key Largo?

    Currently, May is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £224). Flying from Portsmouth to Key Largo in July is currently the most expensive (average of £343). 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 Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
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Top 10 airlines flying from Portsmouth to Key Largo

Discover the top 10 airlines that operate flights from Portsmouth to Key Largo. 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 28 January 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£268Average£401FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
DeltaCheapest£289Average£606FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
IcelandairCheapest£290Average£368FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
SWISSCheapest£292Average£425FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£304Average£357FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£319Average£490FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
A.P.G.Cheapest£335Average£532FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
LufthansaCheapest£337Average£463FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
United AirlinesCheapest£342Average£486FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air EuropaCheapest£346Average£449FlexibilityNo cancel feeOn-time83%
Search Air Europa flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travellers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Portsmouth to Key Largo?

Cheapflights helps you search for flights from Portsmouth to Key Largo via 900+ travel sites so you don’t have to. After performing a flight search, users can also filter their flight selection by filtering for price, number of stops, airlines, and so on.

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

By finding flights from multiple airlines and providers at completely no cost, Cheapflights helps millions of users like you annually find the best flights to Key Largo from Portsmouth.

Can Cheapflights find flights from Portsmouth to Key Largo with no change fees?

Certainly. Search results for flights to Key Largo from Portsmouth shown to you on Cheapflights can be narrowed down with different useful search filters, which includes flexible booking options.

Can Cheapflights notify me if prices for flights from Portsmouth to Key Largo become cheaper?

Yes! Start tracking prices for Portsmouth to Key Largo flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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