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$139+ Cheap flights from Key Largo, FL to Seattle (SEA)

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 12/23. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SEA
Oct 17 — Oct 241
Fri 10/17
Fri 10/24
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Seattle/Tacoma Intl are usually found in January or February, booked 60 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Key Largo to Seattle

Keep the following information in mind while searching for Key Largo to Seattle flight deals. Data was last updated September 17, 2025.

Round-trip from

$213
(Frontier)

One-way from

$139
(Alaska Airlines)

Popular in

March

Cheapest in

January

Average price

$317
From Key Largo to Seattle/Tacoma Intl
Search Deals
One-way flight from Key Largo to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 4% potential increase in price ($16 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Find flight deals from Key Largo to Seattle

Cheapest flights from Key Largo to Seattle
Explore the most affordable flight options available from Key Largo to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 17, 2025.

This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/319:24 pmMIA - SEA
2 stops17h 49mFrontier
Sat 11/812:58 pmSEA - MIA
1 stop14h 21mFrontier
Deal found 9/15$213
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/107:50 pmMIA - SEA
Nonstop6h 45mAmerican Airlines
Wed 10/158:49 pmSEA - MIA
Nonstop5h 41mAmerican Airlines
Deal found 9/15$217
This American Airlines deal was found by Cheapflights users on 9/15. 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 American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/97:50 pmMIA - SEA
Nonstop6h 45mAmerican Airlines
Wed 10/158:49 pmSEA - MIA
Nonstop5h 41mAmerican Airlines
Deal found 9/15$218
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/96:00 amMIA - SEA
1 stop9h 13mFrontier
Sun 11/162:22 pmSEA - MIA
1 stop12h 57mFrontier
Deal found 9/15$219
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:43 pmMIA - SEA
2 stops15h 50mFrontier
Thu 11/61:08 pmSEA - MIA
1 stop14h 11mFrontier
Deal found 9/15$220
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 11/106:00 amMIA - SEA
1 stop9h 13mFrontier
Fri 11/142:22 pmSEA - MIA
1 stop12h 57mFrontier
Deal found 9/15$222
This CheapOair deal was found by Cheapflights users on 9/16. 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 CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/46:45 amMIA - SEA
1 stop16h 54mFrontier
Fri 10/102:31 pmSEA - MIA
1 stop12h 48mFrontier
Deal found 9/16$223
This Frontier deal was found by Cheapflights users on 9/15. 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 Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 10/316:00 amMIA - SEA
1 stop9h 13mFrontier
Fri 11/72:22 pmSEA - MIA
1 stop12h 57mFrontier
Deal found 9/15$224
This Vliegwinkel deal was found by Cheapflights users on 9/16. 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 Vliegwinkel is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/96:43 pmMIA - SEA
Nonstop6h 47mHawaiian Airlines
Wed 10/158:30 amSEA - MIA
Nonstop5h 59mHawaiian Airlines
Deal found 9/16$230
This Cheapflightsfares deal was found by Cheapflights users on 9/17. 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 Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/156:43 pmMIA - SEA
Nonstop6h 47mAlaska Airlines
Wed 10/228:30 amSEA - MIA
Nonstop5h 59mAlaska Airlines
Deal found 9/17$232
This CheapOair deal was found by Cheapflights users on 9/15. 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.
Mon 10/136:00 amMIA - SEA
1 stop9h 07mFrontier
Fri 10/178:43 pmSEA - MIA
1 stop30h 36mFrontier
Deal found 9/15$234

Cheapflights Fare Finder

 
Customize your flight search to find flights from Key Largo to Seattle 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 September 17, 2025.
Use the filters below to find and compare flights from Key Largo to Seattle that are best for you.

Fly from

Key Largo

Fly to

Seattle

Route

Depart

Return

Price

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 10/10

6:43 pm-10:30 pm

Nonstop6h 47m

Seattle/Tacoma Intl

Mon 10/13

8:30 am-5:29 pm

Nonstop5h 59m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 10/9

6:05 pm-9:47 pm

Nonstop6h 42m

Seattle/Tacoma Intl

Wed 10/15

8:00 am-4:54 pm

Nonstop5h 54m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 12/24

7:25 am-11:22 am

Nonstop6h 57m

Seattle/Tacoma Intl

Mon 1/5

9:20 pm-6:05 am

Nonstop5h 45m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Tue 10/14

6:45 am-12:51 pm

1 stop9h 06m

Seattle/Tacoma Intl

Tue 10/21

10:54 pm-12:18 pm

1 stop10h 24m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 1/8

5:55 pm-9:25 pm

Nonstop6h 30m

Seattle/Tacoma Intl

Tue 1/13

7:55 am-4:55 pm

Nonstop6h 00m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 12/24

6:00 pm-9:54 pm

Nonstop6h 54m

Seattle/Tacoma Intl

Tue 1/6

9:20 pm-6:05 am

Nonstop5h 45m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 12/24

5:00 pm-8:50 pm

Nonstop6h 50m

Seattle/Tacoma Intl

Mon 1/5

8:00 am-5:05 pm

Nonstop6h 05m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 10/9

6:43 pm-10:30 pm

Nonstop6h 47m

Seattle/Tacoma Intl

Wed 10/15

8:30 am-5:29 pm

Nonstop5h 59m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/4

6:34 pm-10:30 pm

Nonstop6h 56m

Seattle/Tacoma Intl

Wed 12/10

8:45 am-5:34 pm

Nonstop5h 49m

$237

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 12/24

6:00 pm-9:54 pm

Nonstop6h 54m

Seattle/Tacoma Intl

Thu 1/1

8:05 am-5:00 pm

Nonstop5h 55m

$257

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/16

Showing 1-10 of 22 results
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Best time to book a flight from Key Largo to Seattle

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

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

Use this chart to determine the optimal time to book a round-trip flight from Key Largo to Seattle. Price data was last updated on September 12, 2025.

To ensure you get the cheapest price possible for a flight from Key Largo to Seattle, you should look to book at least 60 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

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

Currently, January is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $238). Flying from Key Largo to Seattle in June is currently the most expensive (average of $387). 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 KE9 to SEA?

Find hourly flight availability from Key Largo to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 17, 2025.

When flying from Key Largo to Seattle, 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 Key Largo to Seattle?

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

Travelers seeking maximum savings on their Key Largo to Seattle flight should consider departing on Tuesday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Key Largo to Seattle

Explore weekly flight availability from Key Largo to Seattle. 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 September 17, 2025.

The most flights from KE9 to SEA are scheduled on a Tuesday (8 on average). You will have fewer flight options on Friday, which is when the least amount of flights are scheduled (5 on average).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated September 17, 2025.
Read reviews from past customers who have flown Alaska Airlines, Delta, and Hawaiian Airlines from Key Largo to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Delta
8.0
Very good
7,961 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Hawaiian Airlines
7.8
Good
2,729 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why
Frontier
5.8
Fair
3,173 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Comfort

7.8

Crew

8.5

Food

7.1

Boarding

8.1

Entertainment

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Aug 2025

MFR - SEA

Great smooth flight. Was hour and half late though. Don't know why

Related info for your journey

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

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Key Largo to Seattle. 8 airlines have flights to Seattle/Tacoma Intl from Key Largo on a regular basis. Booking flights from Key Largo to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 7 inbound flights from Key Largo per day.

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

    Within the past month, 44 users have taken a look at flights from Key Largo to Seattle/Tacoma Intl.

  • How long is the flight from Key Largo to Seattle?

    Airlines like Hawaiian Airlines, Delta, and Alaska Airlines fly from Key Largo to Seattle in about 6h 42m. The time it takes to get you to your destination is usually consistent. Airlines will cover a distance of 2719 mi. Generally, flights for this route are nonstop.

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

    $139 is the cheapest one-way deal found within the past few days, from Delta. You may also be able to find cheap deals on United Airlines and Alaska Airlines, with prices starting from $139 and $139, respectively.

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

    No one likes to see their flight delayed. When booking a flight from Key Largo to Seattle consider choosing American Airlines (65%), GOL (65%) or Qatar Airways (56%) as they are the most reliable in getting you off to your destination on time.

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

    Looking for the cheapest flight from Key Largo to Seattle? While on average our users pay $664, our data indicates the cheapest price to be $133. The most popular route (Miami - Seattle/Tacoma Intl), is priced around $197.

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

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

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

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

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

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

    Currently, January is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $238). Flying from Key Largo to Seattle in June is currently the most expensive (average of $387). 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

Traveling to a place near Seattle?

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Top 8 airlines flying from Key Largo to Seattle

Discover the top 8 airlines that operate flights from Key Largo to Seattle. 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 September 17, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$307FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$118Average$274FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$123Average$245FlexibilityNo cancel feeOn-time65%
DeltaCheapest$191Average$350FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$199Average$411FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$214Average$330FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$214Average$441FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$221Average$393FlexibilityNo cancel feeOn-time75%

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