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$119+ 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 10/8. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SEA
Aug 19 — Aug 261
Tue 8/19
Tue 8/26
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 78 days in advance, depart on a Wednesday or Thursday and return on a Tuesday

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 August 14, 2025.

Round-trip from

$190
(Kiwi.com)

One-way from

$119
(Southwest)

Popular in

March

Cheapest in

January

Average price

$322
From Key Largo to Seattle/Tacoma Intl
Search Deals
One-way flight from Key Largo to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 5% potential increase in price ($19 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 August 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 August 14, 2025.

This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/156:00 amMIA - SEA
1 stop21h 30mFrontier
Thu 9/256:12 amSEA - MIA
1 stop15h 32mFrontier
Deal found 8/14$190
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:45 amMIA - SEA
1 stop16h 54mFrontier
Wed 9/107:00 amSEA - MIA
1 stop14h 44mFrontier
Deal found 8/14$193
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/236:00 amMIA - SEA
1 stop9h 07mFrontier
Mon 10/2710:16 amSEA - MIA
1 stop11h 34mFrontier
Deal found 8/14$195
This FlightHub deal was found by Cheapflights users on 8/14. 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 FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/66:45 amMIA - SEA
1 stop16h 54mFrontier
Sun 9/146:12 amSEA - MIA
1 stop15h 32mFrontier
Deal found 8/14$196
This Mytrip deal was found by Cheapflights users on 8/14. 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.
Fri 9/56:00 amMIA - SEA
1 stop21h 30mFrontier
Thu 9/116:12 amSEA - MIA
1 stop15h 32mFrontier
Deal found 8/14$199
This CheapOair deal was found by Cheapflights users on 8/14. 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.
Thu 8/216:00 amMIA - SEA
1 stop30h 34mFrontier
Wed 10/17:00 amSEA - MIA
1 stop14h 44mFrontier
Deal found 8/14$203
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/116:00 amMIA - SEA
1 stop21h 30mFrontier
Fri 9/196:12 amSEA - MIA
1 stop15h 32mFrontier
Deal found 8/14$206
This Frontier deal was found by Cheapflights users on 8/14. 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 10/306:00 amMIA - SEA
1 stop9h 13mFrontier
Sun 11/212:58 pmSEA - MIA
2 stops14h 21mFrontier
Deal found 8/14$209
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/57:54 pmMIA - SEA
2 stops27h 45mMultiple Airlines
Thu 9/116:12 amSEA - MIA
1 stop15h 32mMultiple Airlines
Deal found 8/14$215
This Kiwi.com deal was found by Cheapflights users on 8/14. 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 Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 9/41:27 pmMIA - SEA
2 stops14h 03mMultiple Airlines
Wed 9/107:00 amSEA - MIA
1 stop14h 44mMultiple Airlines
Deal found 8/14$216

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 August 14, 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

Sat 9/6

6:45 am-8:39 pm

1 stop16h 54m

Seattle/Tacoma Intl

Sun 9/14

6:12 am-12:44 am

1 stop15h 32m

$196

MiamiSeattle

MIA - SEA

MIASEA

Miami

Sun 9/7

6:00 am-12:30 am

1 stop21h 30m

Seattle/Tacoma Intl

Sun 9/14

6:12 am-12:44 am

1 stop15h 32m

$196

MiamiSeattle

MIA - SEA

MIASEA

Miami

Sat 10/4

6:45 am-8:39 pm

1 stop16h 54m

Seattle/Tacoma Intl

Wed 10/22

8:43 pm-6:19 am

1 stop30h 36m

$196

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 9/5

6:00 am-12:30 am

1 stop21h 30m

Seattle/Tacoma Intl

Thu 9/11

6:12 am-12:44 am

1 stop15h 32m

$199

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 8/22

6:00 am-12:34 am

1 stop21h 34m

Seattle/Tacoma Intl

Wed 8/27

6:41 am-6:30 am

1 stop20h 49m

$203

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 9/11

6:00 am-12:30 am

1 stop21h 30m

Seattle/Tacoma Intl

Fri 9/19

6:12 am-12:44 am

1 stop15h 32m

$206

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 10/30

6:00 am-12:13 pm

1 stop9h 13m

Seattle/Tacoma Intl

Sun 11/2

12:58 pm-6:19 am

2 stops14h 21m

$209

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 9/5

7:54 pm-8:39 pm

2 stops27h 45m

Seattle/Tacoma Intl

Thu 9/11

6:12 am-12:44 am

1 stop15h 32m

$215

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 9/4

1:27 pm-12:30 am

2 stops14h 03m

Seattle/Tacoma Intl

Wed 9/10

7:00 am-12:44 am

1 stop14h 44m

$216

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 9/4

6:00 am-12:30 am

1 stop21h 30m

Seattle/Tacoma Intl

Tue 9/16

7:00 am-6:04 pm

2 stops32h 04m

$223

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/12

Showing 1-10 of 20 results
1
2

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 August 8, 2025.

To ensure you get the cheapest price possible for a flight from Key Largo to Seattle, you should look to book at least 78 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 $389). 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 August 14, 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 August 14, 2025.

The most flights from KE9 to SEA are scheduled on a Thursday (8 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (7 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 August 14, 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

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Delta
8.0
Very good
7,980 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Hawaiian Airlines
7.8
Good
2,656 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
American Airlines
7.2
Good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.
Frontier
5.8
Fair
3,217 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Boarding

8.1

Overall

8.0

Entertainment

7.0

Comfort

7.8

Crew

8.5

Food

7.1

Reviews

1 / 20
10.0
Excellent

Anonymous,Jul 2025

EUG - SEA

Mobility support was fabulous No flight entertainment that I was aware of.

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, 39 users have taken a look at flights from Key Largo to Seattle/Tacoma Intl.

  • 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 LATAM Airlines (72%), Air Tahiti Nui (70%) or Delta (69%) 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 $1,081, our data indicates the cheapest price to be $138. The most popular route (Miami - Seattle/Tacoma Intl), is priced around $237.

  • 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 $389). 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?

Book flights to Seattle if you plan to visit one of these locations
SeaTac
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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 August 14, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$297FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$118Average$284FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$119Average$228FlexibilityNo cancel feeOn-time65%
DeltaCheapest$193Average$349FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$199Average$420FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$214Average$353FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$214Average$458FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$225Average$387FlexibilityNo cancel feeOn-time75%

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