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$143+ 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 3/2. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SEA
Feb 28 — Mar 71
Sat 2/28
Sat 3/7
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Seattle/Tacoma Intl are usually found in October or February, booked 87 days in advance, depart on a Wednesday or Friday and return on a Thursday

Cheap 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 January 29, 2026.

This CheapOair deal was found by Cheapflights users on 1/27. 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.
Tue 4/147:50 am
MIA
-
SEA
1 stop28h 37m
Frontier
Mon 5/184:20 pm
SEA
-
MIA
1 stop9h 45m
Frontier
Deal found 1/27$191
This Delta deal was found by Cheapflights users on 1/27. 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.
Fri 2/276:24 pm
MIA
-
SEA
Nonstop6h 51m
Delta
Mon 3/28:30 am
SEA
-
MIA
Nonstop5h 44m
Delta
Deal found 1/27$199
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 2/276:25 am
MIA
-
SEA
1 stop32h 36m
Frontier
Mon 3/210:06 am
SEA
-
MIA
2 stops16h 08m
Frontier
Deal found 1/27$203
This Kiwi.com deal was found by Cheapflights users on 1/27. 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.
Wed 4/86:04 pm
MIA
-
SEA
Nonstop6h 56m
Hawaiian Airlines
Wed 4/158:00 am
SEA
-
MIA
Nonstop6h 07m
Hawaiian Airlines
Deal found 1/27$209
This CheapOair deal was found by Cheapflights users on 1/27. 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 4/275:50 am
MIA
-
SEA
1 stop30h 37m
Frontier
Mon 5/119:35 pm
SEA
-
MIA
1 stop30h 57m
Frontier
Deal found 1/27$212
This Kiwi.com deal was found by Cheapflights users on 1/29. 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 2/2611:28 am
MIA
-
SEA
2 stops51h 33m
Frontier
Thu 3/51:16 pm
SEA
-
MIA
1 stop12h 58m
Frontier
Deal found 1/29$218
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 3/66:05 pm
MIA
-
SEA
1 stop9h 25m
Southwest
Mon 3/911:55 pm
SEA
-
MIA
1 stop8h 45m
Southwest
Deal found 1/28$219
This Kiwi.com deal was found by Cheapflights users on 1/27. 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 3/78:08 pm
MIA
-
SEA
1 stop17h 11m
Frontier
Sun 3/1512:24 pm
SEA
-
MIA
2 stops33h 47m
Frontier
Deal found 1/27$220
This Southwest deal was found by Cheapflights users on 1/28. 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 Southwest is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 2/252:00 pm
MIA
-
SEA
1 stop11h 30m
Southwest
Wed 3/46:45 am
SEA
-
MIA
1 stop11h 45m
Southwest
Deal found 1/28$224

Find 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 January 29, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

FlightHub
3 stars

Round-trip from

$191
(CheapOair)

One-way from

$143
(Kiwi.com)

Popular in

November

Cheapest in

October

Average price

$341
Provider with most accurate pricing for Miami-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Miami-Seattle/Tacoma Intl flights.
Search Deals
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. 3% potential increase in price ($12 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 2% potential price decrease ($8 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

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 January 29, 2026.
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

Thu 3/19

1:00 pm-7:25 pm

1 stop9h 25m

Seattle/Tacoma Intl

Tue 3/24

11:59 pm-10:55 am

1 stop7h 56m

$258

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 5/7

4:15 pm-10:42 pm

1 stop9h 27m

Seattle/Tacoma Intl

Sat 5/16

11:59 pm-11:02 am

1 stop8h 03m

$267

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 3/27

5:56 pm-9:48 pm

Nonstop6h 52m

Seattle/Tacoma Intl

Tue 3/31

8:00 am-4:46 pm

Nonstop5h 46m

$279

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 4/2

12:50 pm-7:42 pm

1 stop9h 52m

Seattle/Tacoma Intl

Mon 4/6

11:35 pm-11:09 am

1 stop8h 34m

$290

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 4/3

6:04 pm-10:00 pm

Nonstop6h 56m

Seattle/Tacoma Intl

Mon 4/6

11:30 am-3:44 pm

1 stop25h 14m

$301

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 5/8

10:50 am-7:48 pm

2 stops11h 58m

Seattle/Tacoma Intl

Sun 5/17

11:59 pm-11:07 am

1 stop8h 08m

$308

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 4/9

4:44 pm-7:02 am

1 stop17h 18m

Seattle/Tacoma Intl

Tue 4/14

8:00 am-5:07 pm

Nonstop6h 07m

$310

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 6/17

6:05 pm-9:59 pm

Nonstop6h 54m

Seattle/Tacoma Intl

Mon 6/29

8:25 am-5:32 pm

Nonstop6h 07m

$317

MiamiSeattle

MIA - SEA

MIASEA

Miami

Tue 6/23

6:08 pm-9:51 pm

Nonstop6h 43m

Seattle/Tacoma Intl

Wed 7/1

8:00 am-5:08 pm

Nonstop6h 08m

$317

MiamiSeattle

MIA - SEA

MIASEA

Miami

Tue 4/14

5:25 pm-9:05 pm

Nonstop6h 40m

$149

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/28

Showing 1-10 of 19 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 January 23, 2026.

To ensure you get the cheapest price possible for a flight from Key Largo to Seattle, you should look to book at least 87 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, April is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $128). Flying from Key Largo to Seattle in November is currently the most expensive (average of $208). 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 January 29, 2026.

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.

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 January 29, 2026.

The most flights from KE9 to SEA are scheduled on a Wednesday (10 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (6 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 January 29, 2026.
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
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Alaska Airlines
8.0
Very good
11,808 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Delta
7.9
Good
8,127 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Hawaiian Airlines
7.8
Good
2,830 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
American Airlines
7.2
Good
11,206 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.
Frontier
5.7
Fair
3,056 reviews
Alaska Airlines
8.0
Very good
11,808 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Crew

8.5

Entertainment

7.0

Reviews

1 / 20
10.0
Excellent

Anonymous,Dec 2025

SJC - SEA

The flight was great. Don’t have to make it better. Everything was OK.

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, 31 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 United Airlines fly from Key Largo to Seattle in about 9h 25m. The time it takes to get you to your destination can typically vary by up to . Airlines will cover a distance of 2719 mi.

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

    $93 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on United Airlines and Hawaiian Airlines, with prices starting from $118 and $118, 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 Qatar Airways (70%), Hawaiian Airlines (70%) or LATAM Airlines (68%) 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 $814, our data indicates the cheapest price to be $130. The most popular route (Miami - Seattle/Tacoma Intl), is priced around $180.

  • 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, April is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $128). Flying from Key Largo to Seattle in November is currently the most expensive (average of $208). 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
Tacoma
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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 January 29, 2026.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$98Average$288FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$101Average$215FlexibilityNo cancel feeOn-time65%
Hawaiian AirlinesCheapest$108Average$252FlexibilityNo cancel feeOn-time85%
DeltaCheapest$157Average$339FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$178Average$357FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$192Average$433FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$197Average$356FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$214Average$307FlexibilityNo cancel feeOn-time63%

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