HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Key Largo

$117+ Cheap flights from Seattle (SEA) to Key Largo, FL

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 4/23. Fares are subject to change and may not be available on all flights or dates of travel.
SEA — MIA
Apr 21 — Apr 281
Mon 4/21
Mon 4/28
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Seattle to Key Largo 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.

Cheapflights Tip: The best prices from Seattle/Tacoma Intl to Key Largo are usually found in January or September, booked 58 days in advance, depart on a Wednesday or Monday and return on a Wednesday

Cheap flight deals from Seattle to Key Largo

Keep the following information in mind while searching for Seattle to Key Largo flight deals. Data was last updated April 16, 2025.

Most accurate provider

FlightHub
3 stars

Most trusted provider

eDreams
3 stars

Round-trip from

$191
(CheapOair)

One-way from

$117
(CheapOair)

Popular in

December

Cheapest in

January

Average price

$447
Provider with most accurate pricing for Seattle/Tacoma Intl-Miami flight deals.
Search Deals
Provider most trusted by Cheapflights users for Seattle/Tacoma Intl-Miami flights.
Search Deals
From Seattle/Tacoma Intl to Key Largo
Search Deals
One-way flight from Seattle/Tacoma Intl to Key Largo
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($23 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in April 2025
Search Deals

Find flight deals from Seattle to Key Largo

Cheapest flights from Seattle to Key Largo
Explore the most affordable flight options available from Seattle to Key Largo. Find the lowest fares from popular airlines and budget airlines, with prices last updated on April 16, 2025.

This CheapOair deal was found by Cheapflights users on 4/15. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/76:24 amSEA - MIA
1 stop19h 58mFrontier
Tue 5/136:00 amMIA - SEA
1 stop20h 49mFrontier
Deal found 4/15$188
This Gotogate deal was found by Cheapflights users on 4/15. 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 Gotogate is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 5/52:30 pmSEA - MIA
2 stops16h 30mMultiple Airlines
Wed 5/146:00 amMIA - SEA
1 stop20h 49mMultiple Airlines
Deal found 4/15$213
This Delta deal was found by Cheapflights users on 4/16. 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.
Wed 5/78:00 amSEA - MIA
Nonstop6h 04mDelta
Tue 5/136:15 pmMIA - SEA
Nonstop6h 41mDelta
Deal found 4/16$237
This Mytrip deal was found by Cheapflights users on 4/15. 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 Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 5/76:00 amSEA - MIA
2 stops36h 15mSpirit Airlines
Tue 5/138:55 pmMIA - SEA
1 stop30h 15mSpirit Airlines
Deal found 4/15$250
This Hawaiian Airlines deal was found by Cheapflights users on 4/16. 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 Hawaiian Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 5/258:25 amSEA - MIA
Nonstop5h 56mHawaiian Airlines
Tue 5/276:21 pmMIA - SEA
Nonstop6h 39mHawaiian Airlines
Deal found 4/16$257
This American Airlines deal was found by Cheapflights users on 4/16. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/612:24 amSEA - MIA
Nonstop5h 46mAmerican Airlines
Tue 5/137:34 pmMIA - SEA
Nonstop6h 33mAmerican Airlines
Deal found 4/16$280
This United Airlines deal was found by Cheapflights users on 4/15. 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 United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 5/1311:35 pmSEA - MIA
1 stop10h 16mUnited Airlines
Tue 5/201:05 pmMIA - SEA
2 stops11h 26mUnited Airlines
Deal found 4/15$362
This Sun Country Air deal was found by Cheapflights users on 4/16. 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 Sun Country Air is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 7/46:42 pmSEA - MIA
1 stop13h 28mSun Country Air
Sat 7/1212:20 pmMIA - SEA
1 stop13h 30mSun Country Air
Deal found 4/16$365
This Alaska Airlines deal was found by Cheapflights users on 4/15. 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 Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 8/277:55 amSEA - MIA
Nonstop6h 11mAlaska Airlines
Sun 8/316:07 pmMIA - SEA
Nonstop6h 34mAlaska Airlines
Deal found 4/15$372

Cheapflights Fare Finder

Customize your flight search to find flights from Seattle 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 2,558,603 searches. Data last updated April 16, 2025.
Use the filters below to find and compare flights from Seattle to Key Largo that are best for you.

Fly from

Seattle

Fly to

Key Largo

Route

Depart

Return

Price

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 5/7

6:24 am-5:22 am

1 stop19h 58m

Miami

Tue 5/13

6:00 am-11:49 pm

1 stop20h 49m

$188

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Mon 5/5

2:30 pm-10:00 am

2 stops16h 30m

Miami

Wed 5/14

6:00 am-11:49 pm

1 stop20h 49m

$213

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 5/7

8:00 am-5:04 pm

Nonstop6h 04m

Miami

Tue 5/13

6:15 pm-9:56 pm

Nonstop6h 41m

$237

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 5/7

6:00 am-9:15 pm

2 stops36h 15m

Miami

Tue 5/13

8:55 pm-12:10 am

1 stop30h 15m

$250

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Sun 5/25

8:25 am-5:21 pm

Nonstop5h 56m

Miami

Tue 5/27

6:21 pm-10:00 pm

Nonstop6h 39m

$257

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 5/6

12:24 am-9:10 am

Nonstop5h 46m

Miami

Tue 5/13

7:34 pm-11:07 pm

Nonstop6h 33m

$280

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 5/13

11:35 pm-12:51 pm

1 stop10h 16m

Miami

Tue 5/20

1:05 pm-9:31 pm

2 stops11h 26m

$362

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Fri 7/4

6:42 pm-11:10 am

1 stop13h 28m

Miami

Sat 7/12

12:20 pm-10:50 pm

1 stop13h 30m

$365

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Wed 4/23

6:00 am-5:21 am

1 stop20h 21m

$117

SeattleMiami

SEA - MIA

SEAMIA

Seattle/Tacoma Intl

Tue 6/10

8:00 am-5:03 pm

Nonstop6h 03m

$119

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/15

Showing 1-10 of 17 results
1
2

Best time to book a flight from Seattle to Key Largo

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

How far ahead should I book a flight from Seattle to Key Largo?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Key Largo. Price data was last updated on April 11, 2025.

The price you pay for your flight from Seattle to Key Largo may vary depending on when you book. For the best chance of a lower fare, look to book 58 days in advance of your trip. Fares are likely to increase a fortnight or so before your departure date.

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

Currently, September is the cheapest month in which you can book a flight from Seattle to Key Largo (average of $229). Flying from Seattle to Key Largo in March is currently the most expensive (average of $289). 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 SEA to KE9?

Find hourly flight availability from Seattle 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 April 16, 2025.

When flying from Seattle 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 Seattle to Key Largo?

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

Travelers seeking maximum savings on their Seattle to Key Largo flight should consider departing on Tuesday afternoons 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 Seattle to Key Largo

Explore weekly flight availability from Seattle 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 April 16, 2025.

The most flights from SEA to KE9 are scheduled on a Tuesday (6 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (5 on average).

Rainfall in Key Largo by month

Plan your trip to Key Largo by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Key Largo ranges from 1.6 - 9.9 inches per month. September is typically the wettest month, when rainfall can reach 9.9 in. January is typically the driest time to visit Key Largo when rainfall is around 1.6 in.

Temperature in Key Largo by month

Plan your trip to Key Largo by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Key Largo, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 68.0 F).

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 April 16, 2025.
Read reviews from past customers who have flown Alaska Airlines, Southwest and Delta from Seattle to Key Largo. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Alaska Airlines
8.0
Very good
9,876 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Southwest
8.0
Very good
4,282 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Delta
8.0
Very good
7,916 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
Hawaiian Airlines
7.9
Good
2,380 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥
United Airlines
7.4
Good
8,665 reviews
Alaska Airlines
8.0
Very good
9,876 reviews

Crew

8.5

Entertainment

7.1

Boarding

8.2

Comfort

7.9

Food

7.1

Overall

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Aug 2024

SEA - LAS

Seats were not that comfy especially for someone with big hips 😥

Related info for your journey

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

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Key Largo. You should not have trouble finding flights to Key Largo from Seattle/Tacoma Intl; the airport handles an average of 5 outbound flights to Key Largo per day. You should also have plenty of airline options to choose from since 10 airlines have flights from the Seattle airport to Key Largo. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

  • How popular is this Seattle to Key Largo flight route?

    The Seattle/Tacoma Intl to Key Largo flight path was viewed by 39 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • What are the cheapest airlines to fly from Seattle to Key Largo one-way?

    $117 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Delta and Spirit Airlines, with prices starting from $119 and $124, respectively.

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

    Before booking your flight to Key Largo from Seattle, check out the most reliable airlines to get you to your destination on time: Delta (89%), GOL (88%), LATAM Airlines( 87%).

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

    The cheapest flight price from Seattle to Key Largo is $118. On average you can expect to pay $856. The most popular route, (Seattle/Tacoma Intl - Miami), can usually be booked for $211.

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

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

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

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

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

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

    Currently, September is the cheapest month in which you can book a flight from Seattle to Key Largo (average of $229). Flying from Seattle to Key Largo in March is currently the most expensive (average of $289). 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 Seattle to Key Largo

See prices for flight routes from nearby airports that may be better suited for you.
Seattle to Orlando flights
Seattle to Miami flights
Seattle to Tampa flights
Portland to Orlando flights
Seattle to Fort Lauderdale flights
Portland to Miami flights
Seattle to Pensacola flights
Seattle to Jacksonville flights
Seattle to Panama City flights
Portland to Fort Lauderdale flights
Portland to Tampa flights
Seattle to West Palm Beach flights
Portland to Key West flights
Seattle to Fort Myers flights
Seattle to Sarasota flights
Portland to Sarasota flights
Spokane to Orlando flights
Portland to Jacksonville flights
Seattle to Key West flights
Seattle to Valparaiso flights
Portland to Pensacola flights
Portland to Valparaiso flights
Portland to Fort Myers flights
Pasco to Orlando flights
Spokane to Miami flights
Spokane to Tampa flights
Portland to Panama City flights
Spokane to Fort Lauderdale flights
Portland to West Palm Beach flights
Pasco to Tampa flights
Seattle to Melbourne flights
Seattle to Daytona Beach flights
Spokane to Valparaiso flights
Spokane to Pensacola flights
Seattle to Tallahassee flights
Pasco to Valparaiso flights
Portland to Daytona Beach flights
Spokane to Fort Myers flights
Spokane to Panama City flights
Pasco to Miami flights
Spokane to West Palm Beach flights
Bellingham to Miami flights
Portland to Tallahassee flights
Pasco to Pensacola flights
Spokane to Daytona Beach flights
Spokane to Sarasota flights
Pasco to Jacksonville flights
Pasco to Fort Lauderdale flights
Walla Walla to Orlando flights
Yakima to Orlando flights

Top 10 airlines flying from Seattle to Key Largo

Discover the top 10 airlines that operate flights from Seattle 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 2,558,603 searches. Data last updated April 16, 2025.
AirlineCheapestAverageFlexibilityOn-time
Hawaiian AirlinesCheapest$118Average$317FlexibilityNo cancel feeOn-time85%
JetBlueCheapest$121Average$253FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$127Average$278FlexibilityNo cancel feeOn-time65%
FrontierCheapest$128Average$283FlexibilityNo cancel feeOn-time62%
Sun Country AirCheapest$174Average$355FlexibilityNo cancel feeOn-time83%
DeltaCheapest$209Average$553FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$237Average$490FlexibilityNo cancel feeOn-time75%
American AirlinesCheapest$246Average$549FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$256Average$457FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$286Average$537FlexibilityNo cancel feeOn-time63%

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.