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Cheap flights from Portsmouth to Key Largo from £530

This is the cheapest retur flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/10. Fares are subject to change and may not be available on all flights or dates of travel.
LHR — MIA
3 Sep — 10 Sep1
1 adult

Cheap 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 August 2025.

Round-trip from

£530

Popular in

December

Cheapest in

September

Average price

£565
9/10-16/10
  • 9/10-16/10
  • 3 total stops
  • 68h 40m total
  • Portsmouth to Key Largo
Search Deals
Highest demand for flights based on searches. 2% potential increase in price (£7 potential increase over avg. return price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease (£9 potential savings vs. average return price).
Search Deals
Average for round-trip flights in August 2025
Search Deals

Find flight deals from Portsmouth to Key Largo

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 August 2025.

Thu 9/1020:00SOU - MIA
2 stops52h 20mMultiple Airlines
Thu 16/1021:35MIA - SOU
1 stop16h 20mMultiple Airlines
Deal found 27/8£530
Mon 13/1009:20SOU - MIA
2 stops20h 09mDelta
Mon 20/1007:10MIA - SOU
2 stops20h 35mDelta
Deal found 29/8£531
Fri 10/1019:25SOU - MIA
1 stop28h 55mMultiple Airlines
Fri 17/1009:49MIA - SOU
2 stops17h 51mMultiple Airlines
Deal found 28/8£591
Mon 29/909:20SOU - MIA
2 stops18h 18mDelta
Mon 6/1011:16MIA - SOU
2 stops16h 29mDelta
Deal found 27/8£597
Mon 13/1009:40SOU - MIA
2 stops34h 05mMultiple Airlines
Sun 19/1000:35MIA - SOU
3 stops37h 55mMultiple Airlines
Deal found 29/8£632
Sat 11/1009:20SOU - MIA
2 stops17h 07mDelta
Sat 18/1007:05MIA - SOU
2 stops20h 40mDelta
Deal found 27/8£649
Thu 9/1009:20SOU - MIA
2 stops20h 09mVirgin Atlantic
Thu 16/1006:00MIA - SOU
2 stops21h 45mVirgin Atlantic
Deal found 27/8£676
Sat 11/1016:25SOU - MIA
2 stops27h 20mMultiple Airlines
Fri 17/1000:25MIA - SOU
2 stops27h 10mMultiple Airlines
Deal found 27/8£701

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 August 2025.
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 9/10

20:00-19:20

2 stops52h 20m

Miami

Thu 16/10

21:35-18:55

1 stop16h 20m

£530

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 13/10

09:20-00:29

2 stops20h 09m

Miami

Mon 20/10

07:10-08:45

2 stops20h 35m

£531

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Fri 10/10

19:25-19:20

1 stop28h 55m

Miami

Fri 17/10

09:49-08:40

2 stops17h 51m

£591

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 29/9

09:20-22:38

2 stops18h 18m

Miami

Mon 6/10

11:16-08:45

2 stops16h 29m

£597

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Mon 13/10

09:40-14:45

2 stops34h 05m

Miami

Sun 19/10

00:35-19:30

3 stops37h 55m

£632

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sat 11/10

09:20-21:27

2 stops17h 07m

Miami

Sat 18/10

07:05-08:45

2 stops20h 40m

£649

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Thu 9/10

09:20-00:29

2 stops20h 09m

Miami

Thu 16/10

06:00-08:45

2 stops21h 45m

£676

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sat 11/10

16:25-14:45

2 stops27h 20m

Miami

Fri 17/10

00:25-08:35

2 stops27h 10m

£701

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Tue 6/1

20:10-18:00

1 stop26h 50m

£785

SouthamptonMiami

SOU - MIA

SOUMIA

Southampton Eastleigh

Sun 4/1

16:00-19:30

2 stops32h 30m

£795

Flights are sorted by cheapest return flights first.

Deals found on 27/8

Showing 1-10 of 16 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, January is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £559). Flying from Portsmouth to Key Largo in July is currently the most expensive (average of £760). 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 29 August 2025.

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.

What is the cheapest day to fly from Portsmouth to Key Largo?

Use this chart to determine the cheapest time to fly return from Portsmouth to Key Largo. Price data was last updated on 16 December 2024.

Travellers seeking maximum savings on their Portsmouth to Key Largo flight should consider departing on Saturday mornings when fares are most often at their lowest. Monday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

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 August 2025.

The most flights from P0R to KE9 are scheduled on a Wednesday (24 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (22 on average).

Reviews of airlines servicing Key Largo

Get insights into the airlines that provide service to Key Largo. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Key Largo. Reviews last updated 29 August 2025.
Get a feel of what it's like to fly with KLM from Portsmouth to Key Largo by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
KLM
7.8
Good
1,383 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.
KLM
7.8
Good
1,383 reviews
KLM
7.8
Good
1,383 reviews
Check prices

Comfort

7.7

Boarding

7.8

Food

7.3

Entertainment

7.1

Crew

8.4

Overall

7.8

Reviews

1 / 20
4.0
Okay

Anonymous,Jun 2025

AMS - BOS

A two and half hour delay caused havoc with all connections. Otherwise on board service was great.

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 20h 09m. 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 (92%), Aeromexico (91%) and Gulf Air (91%).

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

    Looking at all options, your cheapest flight can be booked for £415. While the most popular route (Southampton Eastleigh - Miami) can be booked for £530 on average our data indicates £1,471 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, January is the cheapest month in which you can book a flight from Portsmouth to Key Largo (average of £559). Flying from Portsmouth to Key Largo in July is currently the most expensive (average of £760). 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

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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 August 2025.
AirlineCheapestAverageFlexibilityOn-time
Norse Atlantic UKCheapest£270Average£407FlexibilityNo cancel feeOn-timeN/A
Search Norse Atlantic UK flights
SWISSCheapest£297Average£467FlexibilityNo cancel feeOn-time79%
Search SWISS flights
Scandinavian AirlinesCheapest£316Average£397FlexibilityNo cancel feeOn-time77%
Search Scandinavian Airlines flights
TAP AIR PORTUGALCheapest£325Average£474FlexibilityNo cancel feeOn-timeN/A
Search TAP AIR PORTUGAL flights
A.P.G.Cheapest£340Average£543FlexibilityNo cancel feeOn-timeN/A
Search A.P.G. flights
IcelandairCheapest£343Average£440FlexibilityNo cancel feeOn-time76%
Search Icelandair flights
LufthansaCheapest£343Average£470FlexibilityNo cancel feeOn-time76%
Search Lufthansa flights
Air EuropaCheapest£352Average£448FlexibilityNo cancel feeOn-time83%
Search Air Europa flights
FinnairCheapest£356Average£514FlexibilityNo cancel feeOn-time76%
Search Finnair flights
British AirwaysCheapest£359Average£485FlexibilityNo cancel feeOn-time70%
Search British Airways 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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