$358 Find Cheap Flights from Seattle to Saint Lucia - Compare and Save

1 adult
1 adult, Economy, 0 bags

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Price, demand and travel trends for Seattle to Saint Lucia flights

Use KAYAK data on prices, travel dates, airlines and seasonal trends to compare options and book flights with more confidence.

What are the cheapest fares from Seattle to Saint Lucia right now?

The cheapest fare from Seattle to Saint Lucia in the last week was $771 round-trip, to Castries Hewanorra (UVF).

Which airport in Saint Lucia is the cheapest to fly to from Seattle?

All flights from Seattle to Saint Lucia arrive at Castries Hewanorra (UVF). On average, round-trip fares are around $956.

What’s the cheapest day to fly from Seattle to Saint Lucia?

Thursday tends to be the cheapest day to fly from Seattle to Saint Lucia, while Saturday is the most expensive. Fares run about 68% higher that day, based on the past 12 months of KAYAK data.

What's the cheapest time of day to fly from Seattle to Saint Lucia?

Data from the past 12 months shows it's cheapest to fly to Saint Lucia during the evening with average prices of $956. The afternoon is the most expensive time to fly, with average prices of $1,120.

Key details for Seattle to Saint Lucia flights

Low season

August

Cheapest flight

$358
Beat the crowds with an average 81% drop in travelers.
The most popular month to fly with an average 112% increase in travelers.
One-way flight from Seattle to Castries

Your Seattle to Saint Lucia flight questions, answered

Find helpful answers about this route, including flight times, airports, airlines and booking tips.

  • Is now a good time to book a flight from Seattle to Saint Lucia?

    Yes. Fares from Seattle to Saint Lucia are low right now. As a rule of thumb, a round-trip under $824 (cheaper than most fares this year) is a good deal, so if you spot one at or below that, it's a good time to book.

  • How much should I budget for a flight from Seattle to Saint Lucia?

    Over the past 12 months, round-trip fares from Seattle to Saint Lucia have ranged from $824 to $1,221.

  • What are the main airports serving Saint Lucia?

    Flights to Saint Lucia use two main airports, Castries George F. L. Charle (SLU) and Castries Hewanorra (UVF).

  • What airlines fly nonstop from Seattle to Saint Lucia?

    Based on the flight schedule for the next 3 months, no airline regularly operates nonstop flights from Seattle to Saint Lucia. One-stop options include:

    • American Airlines
    • Delta
    • United Airlines

  • Which cabin classes are available on flights from Seattle to Saint Lucia?

    On flights from Seattle to Saint Lucia you can book Economy Class or First Class.

Your guide to booking Seattle to Saint Lucia flights

Get tips on when to book, when to fly and what to know before your trip.
  • If your travel dates are flexible, book your trip for January when flights are typically cheapest and avoid June when prices are at their highest.
  • Flying on Thursday is usually the cheapest. Flights on Saturday cost about 68% more on average, so being flexible with your travel dates could help you save.
  • Start your trip in Castries, which is the most popular destination in Saint Lucia. From there, it's easy to continue on to other popular destinations such as Soufrière, Gros Islet and Vieux Fort.

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.
7.0
American AirlinesOverall score based on 12215 reviews
7.2Comfort
7.9Crew
6.8Entertainment
7.4Boarding
6.4Food
Airline reviews

No flight delays. No need to rebook to make connections. Enjoyed second leg of flight on Iberia.

2.0 MediocreAnonymous, Oct 2026
Read more American Airlines reviews

No flight delays. No need to rebook to make connections. Enjoyed second leg of flight on Iberia.

I had to buy another ticket and you haven't reimburse me for it.

Wheelchair folks are great. Food not to my liking. Crew more interested in their lives than the passengers. Got the job done but just the minimum.

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.

More options for your flight from Seattle to Saint Lucia

Complete your trip to Saint Lucia with a hotel stay or car rental