$672 Find Cheap Flights from Seattle to Saint Lucia - Compare and Save

This is the cheapest round-trip flight price found by a KAYAK user in the last 72 hours by searching for a flight from Seattle to Saint Lucia departing on 12/1. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
1 adult
1 adult, Economy, 0 bags

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Book Cheap Seattle to Saint Lucia Plane Tickets

 
Here are some of the best deals found on KAYAK recently from the most popular airlines for round-trip flights from Seattle to Saint Lucia that are departing in the next months. While these flights were available on KAYAK in the last 72 hours, prices and availability are subject to change and deals may expire.
Discover the best prices for you by selecting your travel dates on KAYAK.

Recent round-trip flight deals from Seattle to Saint Lucia

Tue, Dec 1 - Sun, Dec 6
Air Canada Logo
7:45 am - 4:40 pm
SEA
-
UVF
28h 55m
1 stop
Air Canada Logo
5:40 pm - 8:59 pm
UVF
-
SEA
31h 19m
1 stop
$672Air Canada
Tue, Dec 1 - Sun, Dec 6
Air Canada Logo
3:15 pm - 4:40 pm
SEA
-
UVF
21h 25m
2 stops
Air Canada Logo
5:40 pm - 2:37 pm
UVF
-
SEA
24h 57m
2 stops
$672Air Canada
Tue, Dec 1 - Sun, Dec 6
Air Canada Logo
7:45 am - 4:40 pm
SEA
-
UVF
28h 55m
1 stop
Air Canada Logo
5:40 pm - 6:22 pm
UVF
-
SEA
28h 42m
2 stops
$754Air Canada
Wed, Oct 7 - Wed, Oct 14
Multiple Airlines Logo
7:20 pm - 2:15 pm
SEA
-
UVF
39h 55m
2 stops
Multiple Airlines Logo
4:25 pm - 10:38 pm
UVF
-
SEA
33h 13m
2 stops
$770Multiple Airlines
Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
10:30 am - 2:15 pm
SEA
-
UVF
24h 45m
2 stops
Multiple Airlines Logo
4:25 pm - 10:38 pm
UVF
-
SEA
33h 13m
2 stops
$770Multiple Airlines
Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
8:00 am - 2:15 pm
SEA
-
UVF
27h 15m
1 stop
Multiple Airlines Logo
4:25 pm - 10:38 pm
UVF
-
SEA
33h 13m
2 stops
$770Multiple Airlines
Thu, Oct 15 - Thu, Oct 22
Multiple Airlines Logo
8:00 am - 2:15 pm
SEA
-
UVF
27h 15m
1 stop
Multiple Airlines Logo
4:25 pm - 9:15 pm
UVF
-
SEA
31h 50m
1 stop
$779Multiple Airlines
Wed, Oct 7 - Wed, Oct 14
Multiple Airlines Logo
7:20 pm - 2:15 pm
SEA
-
UVF
39h 55m
2 stops
Multiple Airlines Logo
4:25 pm - 9:15 pm
UVF
-
SEA
31h 50m
1 stop
$779Multiple Airlines
Sat, Oct 17 - Sat, Oct 31
American Airlines Logo
5:38 pm - 3:03 pm
SEA
-
UVF
18h 25m
2 stops
American Airlines Logo
4:04 pm - 12:12 pm
UVF
-
SEA
23h 08m
2 stops
$914American Airlines
Tue, Dec 1 - Sun, Dec 6
American Airlines Logo
9:14 pm - 3:53 pm
SEA
-
UVF
14h 39m
1 stop
American Airlines Logo
2:23 pm - 11:16 pm
UVF
-
SEA
12h 53m
1 stop
$914American Airlines
Booking Insights

KAYAK's insights & trends for Seattle to Saint Lucia flights

Get data-powered insights and trends into flights from Seattle to Saint Lucia to help you find the cheapest flights, the best time to fly and much more.

What is the cheapest month to fly from Seattle to Saint Lucia?

To calculate monthly average prices, KAYAK takes all prices for each month over the last year for round-trip flights from Seattle to Saint Lucia, removes the top 0.1% to account for outliers, and then takes the median of all values for each month.

The cheapest month for flights from Seattle to Saint Lucia is February, when tickets cost $0 (return) on average. On the other hand, the most expensive months are December and June, when the average cost of round-trip tickets is $1,852 and $1,573 respectively.

Good to know

Cheapest flight

$672
Most popular time to fly and prices are also 18% lower on average.
Flight from Seattle to Castries

FAQs - booking Saint Lucia flights

  • How does KAYAK find such low prices on flights from Seattle to Saint Lucia?

    KAYAK is a travel search engine. That means we look across the web to find the best prices we can find for our users. With over 2 billion flight queries processed yearly, we are able to display a variety of prices and options on flights from Seattle to Saint Lucia.

  • How does KAYAK's flight Price Forecast tool help me choose the right time to buy my flight ticket from Seattle to Saint Lucia?

    KAYAK’s flight Price Forecast tool uses historical data to determine whether the price for a flight from Seattle to Saint Lucia is likely to change within 7 days, so travelers know whether to wait or book now.

  • What is the Hacker Fare option on flights from Seattle to Saint Lucia?

    Hacker Fares allow you to combine one-way tickets in order to save you money over a traditional round-trip ticket. You could then fly from Seattle to Saint Lucia with an airline and back with another airline.

  • What is KAYAK's "flexible dates" feature and why should I care when looking for a flight from Seattle to Saint Lucia?

    Sometimes travel dates aren't set in stone. If your preferred travel dates have some wiggle room, flexible dates will show you all the options when flying from Seattle to Saint Lucia up to 3 days before/after your preferred dates. You can then pick the flights that suit you best.

Reviews of the top airline flying from Seattle to Saint Lucia

 
Need help choosing which airline to fly with from Seattle to Saint Lucia? KAYAK airline reviews give an overall score for each airline based on loads of factors, including comfort, boarding, in-flight entertainment and more, to make your decision easier. See airline scores according to verified KAYAK customer reviews.
7.1
American AirlinesOverall score based on 11839 reviews
7.2Comfort
6.4Food
7.9Crew
6.8Entertainment
7.5Boarding
Airline reviews

Flight attendants and crew were great! This plane was fine. It was clean and everything worked properly. Now, the gate change was not communicated. No text or information. It wasn't far with the gate change but it still changed without any communication. Not sure if this is on American or Kayakl. Also, internet was the worst. I would never have ATT. 3+hr flight and weak internet. I think I watched the commercials to get on at least 6 times. Terrible internet!

6.0 GoodAmy, Jul 2026
SEA - DFW
Read more American Airlines reviews

Flight attendants and crew were great! This plane was fine. It was clean and everything worked properly. Now, the gate change was not communicated. No text or information. It wasn't far with the gate change but it still changed without any communication. Not sure if this is on American or Kayakl. Also, internet was the worst. I would never have ATT. 3+hr flight and weak internet. I think I watched the commercials to get on at least 6 times. Terrible internet!

We did not have enough time to make our connecting flight. As a result, we were put onto a different airline for our second leg. The different airline was NOT comparable to British Airlines, and our arrival was significantly delayed. The actual flight on BA was amazing.

So excited very proud first of all I wanna thank kayak all updates very professional and fast alart And amazing cabin crew so nice to me they deserve big salute

Great flight - friendly and attentive team! Seats in coach were comfy, but a little cramped - but that is the case with all airlines ;)

Dreadful experience. Our flight was delayed more than 8 hours due to a maintenance issue and the assistance from rebooking was poor. I was travelling with a bad knee and needed assistance waited in one place more than 3 hours before someone came with a wheelchair. The woman next to me was a 91 year old great grandmother who had waited more than 4 hours. There were moments of support from the staff but it appeared as they were going against the direction of management. It was apathy, lack of ownership and dismissive responses with small moments of kindness and understanding typically from grey haired, female, veteran staff..

Everything was great except it became so hot on the plane I couldn’t sleep on my red eye flight. It didn’t really cool down till we started descending.

The only thing is if Wi-Fi is available after you land and taxi to the gate. It takes forever to get to the gate, and having the Wi-Fi continue would be great to bide the time at least 5 minutes before you arrive at the entrance. That is my only comment; otherwise, everything was good.

Airplane was cold. Flight attendants were rude. Phone charger did not work. No food available.

Experience was fine. Seats were cramped, and we had to wait for repairs before we could take of. Even though the door remained open, we were warned that leaving the plane could cause difficulty trying to fly out later. Staff was pleasant, and climate control was fortunately working. We had trouble at the DFW terminal, but I don't think that was AA's fault.

This flight was fine but had no time to breathe as the connection was late from Sea to ORD.. Super stressful. If we checked bags, the trip would have been very distressed.

Everything you need to know for your flight from Seattle to Saint Lucia

Information on your arrival and departure airports