C$537 Cheap Flights from Castries (SLUA) to Seattle (SEAA)

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Flight deals from Castries to Seattle

Looking for a cheap last-minute deal or the best return flight from Castries to Seattle? If you want to travel next month, return fares start from C$1,473. Find the lowest prices on one-way and return tickets right here.

Find the cheapest month to fly from Castries to Seattle

We’re always keeping an eye on fares, so you can find the best one in seconds. It looks like Castries to Seattle flights are currently cheapest in August.

Castries to Seattle: Flight information

The things to know before you go.
Cheapest flight foundC$538
Cheapest month to flyAugust

Finding cheap flights from Castries to Seattle: Frequently asked questions

There are 4 airports in Seattle: Seattle Lake Union SPB, Seattle Boeing Fld, Seattle / Tacoma International, and Paine Field.
The best price we found for a return flight from Castries to Seattle is C$1,473. This is an estimate based on information collected from different airlines and travel providers over the last 4 days and is subject to change and availability.
Currently, there are no airlines that fly direct from Castries to Seattle. But we found flights with one or more stops from C$1,473.
As of June 2026, there are no flights flying from Castries to Seattle.
The cheapest month to fly from Castries to Seattle is usually July.
If you're flying from Castries, the cheapest airport near Seattle is Seattle / Tacoma International – which is 19.5 km away from the centre of Seattle. We've found flights into this airport from C$1,473.
After crunching the numbers on our flight calendar, we found that it is currently cheapest to fly from Castries to Seattle on Wednesday, July 15, 2026.
No airlines currently offer direct flights between Castries and Seattle. Most routes have one or more stops.
We show every price from over 1,200 airlines and travel agents, comparing them all so you don’t have to. If you know you want to fly to Seattle but you’re not ready to book, set up a Price Alert. We’ll track prices for you, and let you know when they rise or fall.
We crunched all the numbers in our flight calendar and it looks like the cheapest time to book a flight to Seattle is around 40 days in advance, so don’t leave your flight to the last minute.
In June, the average temperature is usually around 14°C. August is typically the warmest month in Seattle, when it usually averages around 23°C. You can expect the least rain in July. The coldest month is December, with temperatures averaging 0°C. The rainiest month is November.
The cheapest airline that flies to Seattle is jetBlue .

Flying from Castries to Seattle: what you need to know

  • There are two main airports to choose from in Castries. Check out your options departing from Hewanorra Airport (UVF) or George F. L. Charles Airport (SLU) when reserving your flight from Castries to Seattle.

  • When choosing where to land in Seattle, Seattle-Tacoma International Airport (SEA) and Lake Union Sea Plane Base (LKE) are the primary hubs.

  • For a smooth journey, turn up at the airport two hours ahead of international flights and one hour before domestic departures. This way, you can comfortably board your flight from Castries to Seattle.

  • If you're jetting off during a major holiday or other peak period, give yourself more time. A good rule is two hours ahead of domestic flights and up to four hours before international departures. Security and check-in lines will be longer.

  • To travel to United States for tourism purposes, you will need an embassy visa if you hold a passport from Saint Lucia. However, visa rules can change and you may need further documentation depending on the purpose and duration of your trip. Always check the latest guidelines before you book your cheap flight from Castries to Seattle.

Flying from Castries

Hewanorra Airport (UVF)

  • Central Castries to UVF is approximately 56 kilometres. Depending on traffic, it'll take you about 1 hour and 9 minutes to get there if you're driving, ride-sharing or catching a cab.

  • Catching an early flight from Castries to Seattle? Avoid the last-minute rush to the terminal (and catch some extra z's) by picking one of these hotels near Hewanorra Airport:

George F. L. Charles Airport (SLU)

  • You can get to SLU from central Castries in approximately 6 minutes by car, depending on traffic conditions. The journey by public transport takes roughly 40 minutes to cover the 3 kilometres or so.

  • Want to enjoy an extra night away before boarding your flight from Castries to Seattle? Relax in a hotel near George F. L. Charles Airport before your trip officially begins. Stay at one of these accommodation options:

Arriving in Seattle

Seattle-Tacoma International Airport (SEA)

  • Seattle-Tacoma International Airport (SEA) is around 23 kilometres from central Seattle. With your own car rental or if you're catching a cab, the drive is about 18 minutes.

  • Travelling on public transport takes roughly 54 minutes.

  • The last thing you want is a long journey to your hotel if you're landing late on a flight from Castries to Seattle. Check in to one of these accommodation options near SEA instead:

Lake Union Sea Plane Base Airport (LKE)

How to find the cheapest flights from Castries to Seattle

  • The lowest price we've seen for a one-way ticket from Castries to Seattle is C$537. For a return flight on this route, the best price is C$1,473. Depending on how early you book and the availability, these fares may change.

  • It's often best to book ahead of time if you want to find cheap flights from Castries to Seattle. That's because flight prices are based on demand, which tends to rise closer to departure.

  • If you can be flexible with your travel plans, use the 'Whole month' search tool. It'll find the lowest price across each month when searching for a ticket from Castries to Seattle.

  • Getting a cheap ticket from Castries to Seattle is a piece of cake with Price Alerts. All you need to do is create one of these automatic alerts and we'll get in touch when the price has dropped.

  • Tailor your travel plans using filters. Pick your ideal arrival and departure times, airlines and total journey duration. You can also sort your results by 'Cheapest,' 'Fastest' or 'Best' flights from Castries to Seattle.

Best time to go to Seattle

  • July is the most popular month for flights from Castries to Seattle. To avoid the crowds, go to Seattle in May.

  • The warmest month in Seattle is August, with temperatures ranging between 12ºC and 28ºC. Lock in your flights from Castries to Seattle in this month if this is the type of weather you like.

  • Search for cheap flights from Castries to Seattle in February if you'd rather travel during cooler conditions. Temperatures are at their lowest around then, ranging between -1ºC and 11ºC on average.

More about Seattle

Complete your Seattle trip with a car rental

  • Finding you a cheap flight from Castries to Seattle isn't our only party trick. Check out our car rentals in Seattle and see the sights your way. We find deals from trusted car rental companies and put them all in one place. You can instantly compare offers and then book with no fees.

Prices shown on this page are estimated lowest prices only. Found in the last 12 days.