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$135+ 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 12/18. Fares are subject to change and may not be available on all flights or dates of travel.
MIA — SEA
Dec 3 — Dec 101
Wed 12/3
Wed 12/10
1 adult, Economy
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Cheapflights Tip: The best prices from Key Largo to Seattle/Tacoma Intl are usually found in February or September, booked 78 days in advance, depart on a Wednesday or Friday and return on a Tuesday

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 November 3, 2025.

This Delta deal was found by Cheapflights users on 11/3. 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.
Thu 12/46:39 pmMIA - SEA
1 stop8h 46mDelta
Wed 12/106:00 amSEA - MIA
1 stop9h 26mDelta
Deal found 11/3$219
This Cheapflightsfares deal was found by Cheapflights users on 11/1. 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.
Thu 12/257:25 amMIA - SEA
Nonstop6h 57mAlaska Airlines
Tue 12/309:20 pmSEA - MIA
Nonstop5h 45mAlaska Airlines
Deal found 11/1$221
This Kiwi.com deal was found by Cheapflights users on 11/2. 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 12/176:00 amMIA - SEA
1 stop21h 10mFrontier
Wed 12/242:46 pmSEA - MIA
1 stop11h 49mFrontier
Deal found 11/2$223
This Expedia deal was found by Cheapflights users on 10/31. 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 Expedia is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:34 pmMIA - SEA
Nonstop6h 56mMultiple Airlines
Mon 12/159:45 amSEA - MIA
1 stop10h 33mMultiple Airlines
Deal found 10/31$224
This Priceline deal was found by Cheapflights users on 10/31. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/126:00 amMIA - SEA
1 stop8h 53mFrontier
Mon 12/159:45 amSEA - MIA
1 stop10h 33mFrontier
Deal found 10/31$226
This Delta deal was found by Cheapflights users on 11/2. 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 12/244:50 pmMIA - SEA
Nonstop6h 53mDelta
Tue 1/67:45 amSEA - MIA
Nonstop5h 52mDelta
Deal found 11/2$228
This Priceline deal was found by Cheapflights users on 11/1. 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 Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 12/86:00 amMIA - SEA
1 stop8h 53mFrontier
Fri 12/123:40 pmSEA - MIA
1 stop10h 39mFrontier
Deal found 11/1$234
This Delta deal was found by Cheapflights users on 11/2. 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 12/176:05 pmMIA - SEA
Nonstop6h 58mDelta
Tue 1/137:45 amSEA - MIA
Nonstop5h 52mDelta
Deal found 11/2$238
This eDestinos deal was found by Cheapflights users on 11/1. 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 eDestinos is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 11/147:07 pmMIA - SEA
2 stops20h 06mMultiple Airlines
Tue 12/92:19 pmSEA - MIA
1 stop12h 00mMultiple Airlines
Deal found 11/1$242

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 November 3, 2025.

Most accurate provider

CheapOair
3 stars

Most trusted provider

CheapOair
3 stars

Round-trip from

$219
(Delta)

One-way from

$135
(CheapOair)

Popular in

March

Cheapest in

February

Average price

$396
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. 4% potential increase in price ($16 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 November 2025
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 November 3, 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

Thu 12/18

6:05 pm-10:03 pm

Nonstop6h 58m

Seattle/Tacoma Intl

Mon 1/12

7:45 am-4:37 pm

Nonstop5h 52m

$238

MiamiSeattle

MIA - SEA

MIASEA

Miami

Fri 1/30

2:49 pm-11:15 pm

1 stop11h 26m

Seattle/Tacoma Intl

Tue 2/3

8:40 am-7:51 pm

1 stop8h 11m

$259

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 11/27

7:17 am-11:15 am

Nonstop6h 58m

Seattle/Tacoma Intl

Tue 12/2

8:45 am-5:34 pm

Nonstop5h 49m

$267

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/25

7:25 am-11:22 am

Nonstop6h 57m

Seattle/Tacoma Intl

Tue 12/30

8:16 am-5:11 pm

Nonstop5h 55m

$267

MiamiSeattle

MIA - SEA

MIASEA

Miami

Tue 3/10

4:45 pm-10:24 pm

1 stop8h 39m

Seattle/Tacoma Intl

Wed 3/11

7:55 am-4:55 pm

Nonstop6h 00m

$268

MiamiSeattle

MIA - SEA

MIASEA

Miami

Wed 12/17

2:11 pm-11:58 pm

1 stop12h 47m

Seattle/Tacoma Intl

Thu 1/15

7:45 am-4:37 pm

Nonstop5h 52m

$271

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/25

7:25 am-11:22 am

Nonstop6h 57m

Seattle/Tacoma Intl

Mon 12/29

9:20 pm-6:05 am

Nonstop5h 45m

$277

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/4

5:00 pm-2:39 pm

1 stop24h 39m

Seattle/Tacoma Intl

Mon 12/8

8:45 am-5:34 pm

Nonstop5h 49m

$291

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/25

7:25 am-11:22 am

Nonstop6h 57m

Seattle/Tacoma Intl

Mon 1/5

5:20 am-3:51 pm

1 stop7h 31m

$297

MiamiSeattle

MIA - SEA

MIASEA

Miami

Thu 12/4

6:00 pm-9:58 pm

Nonstop6h 58m

Seattle/Tacoma Intl

Wed 12/10

3:47 pm-9:27 am

1 stop14h 40m

$310

Flights are sorted by cheapest round-trip flights first.

Deals found on 11/1

Showing 1-10 of 21 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 October 31, 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, February is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $121). Flying from Key Largo to Seattle in November is currently the most expensive (average of $213). 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 November 3, 2025.

When flying from Key Largo to Seattle, the time of day you fly usually plays a role in the price. Save by searching for a flight in the evening, which can drop the price by up to 57% versus a flight in the morning.

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 Friday at noon when fares are most often at their lowest. Monday 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 November 3, 2025.

The most flights from KE9 to SEA are scheduled on a Monday (8 on average). You will have fewer flight options on Tuesday, 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 November 3, 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
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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
11,235 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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
7.9
Good
8,001 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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
2,799 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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
11,036 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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
3,117 reviews
Alaska Airlines
8.0
Very good
11,235 reviews

Entertainment

7.0

Crew

8.5

Boarding

8.1

Food

7.1

Comfort

7.8

Overall

8.0

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, 40 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 Delta, United Airlines, and Alaska Airlines fly from Key Largo to Seattle in about 6h 58m. The time it takes to get you to your destination can typically vary by up to 4h 28m. Airlines will cover a distance of 2719 mi. Both multi-stop and nonstop flights can be found to your destination and back.

  • 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 Alaska Airlines (75%), Hawaiian Airlines (75%) or Air Tahiti Nui (75%) 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 $485, our data indicates the cheapest price to be $133. The most popular route (Miami - Seattle/Tacoma Intl), is priced around $192.

  • 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, February is the cheapest month in which you can book a flight from Key Largo to Seattle (average of $121). Flying from Key Largo to Seattle in November is currently the most expensive (average of $213). 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
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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 November 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$108Average$305FlexibilityNo cancel feeOn-time62%
Hawaiian AirlinesCheapest$118Average$281FlexibilityNo cancel feeOn-time85%
Spirit AirlinesCheapest$119Average$254FlexibilityNo cancel feeOn-time65%
DeltaCheapest$196Average$351FlexibilityNo cancel feeOn-timeN/A
United AirlinesCheapest$199Average$384FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$214Average$330FlexibilityNo cancel feeOn-time63%
American AirlinesCheapest$214Average$437FlexibilityNo cancel feeOn-time71%
Alaska AirlinesCheapest$217Average$383FlexibilityNo cancel feeOn-time75%

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