Cheap flights from Seattle to Cardiff from $970
This is the cheapest round-trip flight price found by a momondo user in the last 72 hours by searching for a flight from Seattle to Cardiff departing on 9/21. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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Delta flights from Seattle to Cardiff
Our best Delta deals on Seattle to Cardiff flight tickets
KLM flights from Seattle to Cardiff
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How to get the cheapest flight ticket from Seattle to Cardiff
Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip
What is the cheapest day to depart on your flight to Cardiff?
The cheapest day to depart on your flight to Cardiff is on a Wednesday when prices can be found for as low as $808. This is often the case because there is less demand to fly during this day of the week. If your travel schedule is flexible, try to avoid departing on a Monday because tickets tend to average around $1,303. These prices are subject to change though, so be sure to set up a Price Alert for flights to Cardiff.
What is the cheapest time of day to depart on your flight to Cardiff?
Flying to Cardiff from Seattle in the morning is the least expensive time of day to depart. momondo users have found prices as low as $941 when looking at flights departing in the morning. If you have a flexible travel schedule, then try to avoid flying in the afternoon when prices are $1,132 on average. Flights to Cardiff from Seattle in the afternoon are generally more expensive because this time of day is more convenient for travelers’ schedules.
When to book flights from Seattle to Cardiff
Cheap Seattle to Cardiff (SEA to CWL) flight deals and tips
Find info about flight duration, direct flights, and airports for your flight from Seattle to Cardiff
How far is Seattle/Tacoma Intl to Cardiff Wales by plane?
The straight-line distance from Seattle/Tacoma Intl to Cardiff Wales is 4700.6 mi. In terms of flight time, this usually takes a little over 15h 05m.
When did momondo last update prices for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?
Prices for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport refresh daily.
How many operators does momondo search for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?
There is 1 operator available for flights from Seattle/Tacoma Intl Airport to Cardiff Wales Airport as of June 2025.
How old do you have to be to fly from Seattle/Tacoma Intl Airport to Cardiff Wales Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Seattle/Tacoma Intl Airport to Cardiff Wales Airport.
What documentation or ID do you need to fly to Cardiff Wales Airport?
The necessary travel and health documents for your Cardiff Wales Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Seattle to Cardiff?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Seattle to Cardiff is KLM (100% of total bookings).
Best airlines flying from Seattle to Cardiff
Compare and see reviews for airlines that fly from Seattle to Cardiff with momondo
| Airline | Rating | Free Cancellation | Price | ||
|---|---|---|---|---|---|
| PriceFrom $760 | Free Cancellation | Rating 7.8 1,358 reviews |
Traveling to a place near Cardiff?
Book flights to Cardiff if you plan to visit one of these locationsWhy use momondo?
Why should I use momondo to find a flight deal from Seattle to Cardiff?
momondo compares prices from hundreds of airlines and agents so you can find and book the best deal on flights from Seattle to Cardiff. Millions of users trust and use momondo every year so you are in good hands.
Can I find flights from Seattle to Cardiff with flexible booking policies on momondo?
momondo does allow users to show only those flights to Cardiff from Seattle which offer a flexible booking policy as well as other useful filters and features.
How can momondo help me find flights from Seattle to Cardiff?
Once all potential Seattle to Cardiff flight options are in front of you, momondo lets you sort and filter flights based on preferences such as airline, price and flight times amongst many other options.
I’m not ready to book a flight from Seattle to Cardiff right now. Can momondo alert me if prices change?
If you are simply researching potential flights to Cardiff, momondo offers a useful price alert feature which will track prices for flights to Cardiff from Seattle and alert you when they change.