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Cheap flights from Portsmouth to Key Largo from £659

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 18/6. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
29 May — 5 Jun1
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 29 April 2026.

Wed 13/509:20
SOU
-
MIA
2 stops20h 39m
Multiple Airlines
Wed 20/521:15
MIA
-
SOU
2 stops17h 15m
Multiple Airlines
Deal found 28/4£723
Tue 14/709:15
SOU
-
MIA
2 stops30h 20m
Delta
Mon 5/1007:00
MIA
-
SOU
2 stops20h 35m
Delta
Deal found 24/4£741
Wed 18/1109:20
SOU
-
MIA
1 stop12h 50m
British Airways
Wed 2/1219:05
MIA
-
SOU
1 stop19h 25m
British Airways
Deal found 28/4£742
Tue 14/709:15
SOU
-
MIA
2 stops30h 20m
Delta
Sat 3/1011:15
MIA
-
SOU
2 stops16h 30m
Delta
Deal found 24/4£770
Mon 13/718:05
SOU
-
MIA
2 stops29h 48m
Delta
Thu 1/1011:35
MIA
-
SOU
2 stops16h 00m
Delta
Deal found 24/4£781
Mon 8/609:05
SOU
-
MIA
1 stop34h 40m
KLM
Mon 15/611:22
MIA
-
SOU
2 stops16h 13m
KLM
Deal found 24/4£786
Tue 27/1019:55
SOU
-
MIA
2 stops23h 45m
British Airways
Tue 17/1122:00
MIA
-
SOU
2 stops14h 40m
British Airways
Deal found 28/4£789
Mon 25/509:05
SOU
-
MIA
1 stop34h 40m
Delta
Mon 1/607:12
MIA
-
SOU
2 stops20h 23m
Delta
Deal found 26/4£800
Tue 9/609:20
SOU
-
MIA
2 stops20h 29m
Aer Lingus
Tue 16/615:00
MIA
-
SOU
2 stops20h 50m
Aer Lingus
Deal found 25/4£801

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 29 April 2026.

Round-trip from

£723

One-way from

£659

Popular in

December

Cheapest in

September

Average price

£528
13/5-20/5
  • 13/5-20/5
  • 4 total stops
  • 37h 54m total
  • Portsmouth to Key Largo
Search Deals
British Airways
  • British Airways
  • 18/6
  • 2 total stops
  • 18h 25m total
  • Portsmouth to Key Largo
Search Deals
Highest demand for flights based on searches. 0% potential increase in price (£3 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (£8 potential savings vs. average return price).
Search Deals
Average for round-trip flights in April 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 29 April 2026.
Use the filters below to find and compare flights from Portsmouth to Key Largo that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest return flight

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 13/7

18:05-18:53

2 stops29h 48m

Miami

Wed 30/9

11:35-08:35

2 stops16h 00m

£781

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 25/5

09:05-14:45

1 stop34h 40m

Miami

Thu 4/6

07:12-08:35

2 stops20h 23m

£800

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Wed 27/5

09:05-22:51

2 stops18h 46m

Miami

Wed 3/6

15:40-16:50

2 stops20h 10m

£804

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 25/5

17:20-16:46

2 stops28h 26m

Miami

Mon 1/6

07:12-08:35

2 stops20h 23m

£804

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 25/5

17:20-16:46

2 stops28h 26m

Miami

Tue 2/6

15:35-16:50

2 stops20h 15m

£804

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 13/7

18:05-18:53

2 stops29h 48m

Miami

Sun 4/10

11:35-08:35

2 stops16h 00m

£812

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 28/5

17:20-16:46

2 stops28h 26m

Miami

Wed 3/6

15:40-16:50

2 stops20h 10m

£834

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Fri 17/7

19:55-20:15

2 stops29h 20m

Miami

Tue 6/10

22:45-21:05

2 stops17h 20m

£855

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Wed 10/6

09:05-14:45

1 stop34h 40m

Miami

Wed 17/6

11:23-08:35

2 stops16h 12m

£865

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sat 18/7

07:50-14:30

2 stops35h 40m

Miami

Sun 4/10

22:45-20:55

2 stops17h 10m

£884

Flights are sorted by cheapest return flights first.

Deals found on 27/4

Showing 1-10 of 24 resultsSorted by cheapest first
1
2
3

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 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 29 April 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 29 April 2026.

The most flights from P0R to KE9 are scheduled on a Tuesday (28 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (10 on average).

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 29h 48m. Fly via Delta to get the fastest option. The distance from Portsmouth to Key Largo is about 4381 mi.

  • 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 (91%), Gulf Air (88%) and SriLankan Airlines (84%).

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

    Looking at all options, your cheapest flight can be booked for £434. While the most popular route (Southampton Eastleigh - Miami) can be booked for £723 on average, our data indicates £1,605 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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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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 29 April 2026.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£272Average£415FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
IcelandairCheapest£295Average£375FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
SWISSCheapest£297Average£424FlexibilityNo cancel feeOn-time79%
Search SWISS flights
DeltaCheapest£306Average£638FlexibilityNo cancel feeOn-timeN/A
Search Delta flights
Scandinavian AirlinesCheapest£308Average£364FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
A.P.G.Cheapest£321Average£467FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
Air EuropaCheapest£352Average£467FlexibilityNo cancel feeOn-time83%
Search Air Europa flights
United AirlinesCheapest£354Average£527FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
British AirwaysCheapest£355Average£524FlexibilityNo cancel feeOn-time70%
Search British Airways flights
Air CanadaCheapest£356Average£536FlexibilityNo cancel feeOn-time67%
Search Air Canada 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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