How popular is this Seattle to Key Largo flight route?

The Seattle/Tacoma Intl to Key Largo flight path was viewed by 49 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?

$105 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from $119 and $119, respectively.

Weekly flight availability from Seattle to Key Largo

The most flights from SEA to KE9 are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

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.

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).

What are the cheapest flights from Seattle to Key Largo?

The cheapest flight price from Seattle to Key Largo is $213. On average you can expect to pay $557. The most popular route, (Seattle/Tacoma Intl - Miami), can usually be booked for $297.

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: Alaska Airlines (87%), LATAM Airlines (87%), Delta( 87%).

What are the most popular airlines that fly from Seattle to Key Largo?

Delta, American Airlines and Alaska Airlines are the most popular airlines when flying from Seattle to Key Largo.

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 3 outbound flights to Key Largo per day. You should also have plenty of airline options to choose from since 7 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.

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.

Find Cheap Flights from Seattle to Key Largo

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

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 March or February, booked 47 days in advance, depart on a Tuesday or Thursday and return on a Wednesday

Find flight deals from Seattle to Key Largo

Most accurate provider	FlightHub 3 stars
Most trusted provider	FlightHub 3 stars
Popular in	December
Cheapest in	March
Average price	$487

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

Highest demand for flights based on searches. 9% potential increase in price ($43 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 2% potential price decrease ($10 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in November 2026

Search Deals

Cheapflights Insights

Everything you need to know about your flight from Seattle to Key Largo

Prices

Airlines

What is the cheapest time of day to fly from SEA to KE9?

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.

Reviews of airlines servicing Key Largo

See what other customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Seattle to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Alaska Airlines

7.9

Good

13,139 reviews

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Delta

7.8

Good

8,697 reviews

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

United Airlines

7.3

Good

10,460 reviews

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

American Airlines

7.0

Good

12,230 reviews

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Frontier

5.5

Fair

2,511 reviews

Alaska Airlines

7.9

Good

13,139 reviews

Reviews

1 / 20

4.0

Okay

Anonymous,Jun 2026

SEA - RNO

There was a delay and my husband needs a wheelchair and we were moved from 1 gate to another.

Related info for your journey

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 3 outbound flights to Key Largo per day. You should also have plenty of airline options to choose from since 7 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 49 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?
$105 is the cheapest one-way deal found within the past few days, from Frontier. You may also be able to find cheap deals on Alaska Airlines and Delta, with prices starting from $119 and $119, 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: Alaska Airlines (87%), LATAM Airlines (87%), Delta( 87%).
What are the cheapest flights from Seattle to Key Largo?
The cheapest flight price from Seattle to Key Largo is $213. On average you can expect to pay $557. The most popular route, (Seattle/Tacoma Intl - Miami), can usually be booked for $297.
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.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

Alternative routes

Complete your trip

Flights by cabin class

Other flight options

Other flights from Seattle

Popular flights

Top destinations

Alternative routes for Seattle to Key Largo

Seattle to Orlando flights

Seattle to Miami flights

Seattle to Fort Lauderdale flights

Seattle to Tampa flights

Portland to Orlando flights

Portland to Miami flights

Seattle to Jacksonville flights

Seattle to Fort Myers flights

Portland to Tampa flights

Portland to Fort Lauderdale flights

Seattle to Pensacola flights

Spokane to Orlando flights

Seattle to Panama City flights

Spokane to Tampa flights

Spokane to Miami flights

Portland to Jacksonville flights

Seattle to Sarasota flights

Portland to Fort Myers flights

Seattle to Key West flights

Spokane to Fort Lauderdale flights

Seattle to Tallahassee flights

Portland to Sarasota flights

Portland to Pensacola flights

Seattle to Valparaiso flights

Spokane to Pensacola flights

Seattle to Daytona Beach flights

Pasco to Orlando flights

Pasco to Miami flights

Seattle to Melbourne flights

Pasco to Fort Lauderdale flights

Spokane to Fort Myers flights

Spokane to Sarasota flights

Spokane to Key West flights

Portland to Daytona Beach flights

Spokane to Jacksonville flights

Pasco to Pensacola flights

Pasco to Tampa flights

Portland to Gainesville flights

Pasco to Fort Myers flights

Spokane to Tallahassee flights

Pasco to Jacksonville flights

Top 7 airlines flying from Seattle to Key Largo

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$143	Average$322	FlexibilityNo cancel fee	On-time62%
Delta	Cheapest$160	Average$496	FlexibilityNo cancel fee	On-timeN/A
Alaska Airlines	Cheapest$202	Average$497	FlexibilityNo cancel fee	On-time75%
United Airlines	Cheapest$205	Average$434	FlexibilityNo cancel fee	On-time69%
JetBlue	Cheapest$258	Average$355	FlexibilityNo cancel fee	On-time62%
American Airlines	Cheapest$336	Average$527	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$336	Average$488	FlexibilityNo cancel fee	On-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.

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

Find cheap flights from Seattle to Key Largo with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Find flight deals from Seattle to Key Largo

Most accurate provider

Most trusted provider

Popular in

Cheapest in

Average price

Cheapflights Insights

What is the cheapest time of day to fly from SEA to KE9?

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.

Weekly flight availability from Seattle to Key Largo

The most flights from SEA to KE9 are scheduled on a Monday (5 on average). You will have fewer flight options on Tuesday, which is when the least amount of flights are scheduled (2 on average).

Reviews of airlines servicing Key Largo

See what other customers who have flown with Alaska Airlines,Delta, andUnited Airlines from Seattle to Key Largo have to say. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

What airport do you fly from for flights from Seattle to Key Largo?

How popular is this Seattle to Key Largo flight route?

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

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

What are the cheapest flights from Seattle to Key Largo?

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

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

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

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.

Complete your trip

Complete your trip to Key Largo by adding a car rental and/or hotel reservation to your travel itinerary.

Search flights from Seattle to Key Largo by cabin class

Find flights from Seattle to Key Largo, based on your preferred cabin class, be it economy, premium economy, business, or first class.

Seattle and Key Largo flights

Browse other Seattle and Key Largo flight options. Last updated on November 4, 2026.

Other flights from Seattle

Browse through other flights departing from Seattle. Flights are based on user searches made on Cheapflights and were last updated on November 4, 2026.

Popular flight searches

Check out other popular destinations found by fellow travelers in 2026

Seattle to Key Largo flights

Consider these flights traveling from Seattle to Key Largo.

Top 7 airlines flying from Seattle to Key Largo

100% Free

Book with Flexibility

Travel Smart