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Cheap flights from Saint John to Key Largo from C$ 342

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 13/9. Fares are subject to change and may not be available on all flights or dates of travel.
YSJ — MIA
4 Aug — 11 Aug1
1 adult

Cheap flight deals from St John to Key Largo

Keep the following information in mind while searching for St John to Key Largo flight deals. Data was last updated 30 July 2025.

Round-trip from

C$ 668

One-way from

C$ 342

Popular in

December

Cheapest in

July

Average price

C$ 309
United Airlines
  • United Airlines
  • 13/9-20/9
  • 4 total stops
  • 28h 57m total
  • Saint John to Key Largo
Search Deals
Air Canada
  • Air Canada
  • 13/9
  • 2 total stops
  • 10h 59m total
  • Saint John to Key Largo
Search Deals
Highest demand for flights based on searches. 12% potential increase in price (C$ 161 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 5% potential price decrease (C$ 62 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from St John to Key Largo

Cheapest flights from St John to Key Largo
Explore the most affordable flight options available from St John to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 30 July 2025.

Sat 13/95:55 a.m.YSJ - MIA
2 stops14h 16mUnited Airlines
Sat 20/98:30 a.m.MIA - YSJ
2 stops14h 41mUnited Airlines
Deal found 30/7C$ 668
Sat 13/911:35 a.m.YSJ - MIA
2 stops10h 59mAir Canada
Sat 20/911:50 a.m.MIA - YSJ
1 stop11h 21mAir Canada
Deal found 30/7C$ 701

Cheapflights Fare Finder

 
Customize your flight search to find flights from St John 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 629,999 searches. Data last updated 30 July 2025.
Use the filters below to find and compare flights from Saint John to Key Largo that are best for you.

Fly from

St John

Fly to

Key Largo

Route

Depart

Return

Price

Saint JohnMiami

YSJ - MIA

YSJMIA

Saint John

Sat 13/9

5:55 a.m.-7:11 p.m.

2 stops14h 16m

Miami

Sat 20/9

8:30 a.m.-12:11 a.m.

2 stops14h 41m

C$ 668

Saint JohnMiami

YSJ - MIA

YSJMIA

Saint John

Sat 13/9

11:35 a.m.-9:34 p.m.

2 stops10h 59m

Miami

Sat 20/9

11:50 a.m.-12:11 a.m.

1 stop11h 21m

C$ 701

Saint JohnMiami

YSJ - MIA

YSJMIA

Saint John

Sat 13/9

11:35 a.m.-9:34 p.m.

2 stops10h 59m

C$ 342

Saint JohnMiami

YSJ - MIA

YSJMIA

Saint John

Sat 13/9

5:55 a.m.-7:11 p.m.

3 stops14h 16m

C$ 779

Flights are sorted by cheapest round-trip flights first.

Deals found on 30/7

Best time to book a flight from St John to Key Largo

Have a flexible travel schedule? Discover the best time to fly to Key Largo from St John 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 Saint John to Key Largo

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

Currently, April is the cheapest month in which you can book a flight from Saint John to Key Largo (average of C$ 251). Flying from Saint John to Key Largo in August is currently the most expensive (average of C$ 369). 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.

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 30 July 2025.
See what other customers who have flown with United Airlines and Air Canada from Saint John to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
United Airlines
7.4
Good
8,896 reviews
Check prices

Food

6.6

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
United Airlines
7.4
Good
8,896 reviews
United Airlines
7.4
Good
8,896 reviews
Check prices

Food

6.6

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.
Air Canada
7.1
Good
9,837 reviews
United Airlines
7.4
Good
8,896 reviews
Check prices

Food

6.6

Comfort

7.3

Entertainment

7.1

Boarding

7.7

Crew

8.1

Overall

7.4

Reviews

1 / 20
4.0
Okay

Thomas,Apr 2025

TPE - SFO

The boarding experience was okay. The dietary food choices were limited, the midway snacks were hard and dry. The seat was uncomfortable - stiff seat cushion, seat back kept springing back to the upright position, narrow seat width. Love the app and the ability to track my luggage. Flight crew was efficient.

Related info for your journey

Find useful and relevant information for your journey from St John to Key Largo. 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 Saint John to Key Largo?

    Most people fly from Saint John (YSJ) if they book a flight from Saint John to Key Largo. On average, Saint John has 0 outbound flights to Key Largo per day from 1 airline. Saint John is conveniently located just 15.1 km from Saint John’s city centre.

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

    Yes. In addition to deals on St John to Key Largo flights, Cheapflights offers vacation packages that include both flights and hotel.

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

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

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

    Yes. Cheapflights offers flight deals from St John 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 Saint John to Key Largo?

    Currently, April is the cheapest month in which you can book a flight from Saint John to Key Largo (average of C$ 251). Flying from Saint John to Key Largo in August is currently the most expensive (average of C$ 369). 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

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Top airline flying from St John to Key Largo

Discover the top airline that operate flights from St John 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 629,999 searches. Data last updated 30 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Air CanadaCheapestC$ 601AverageC$ 901FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

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

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

Certainly. Search results for flights to Key Largo from St John 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 St John to Key Largo become cheaper?

Yes! Start tracking prices for St John 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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