Cheap Flights from Seattle to Cardiff
No deal from Seattle to Cardiff has cleared our price bar yet. What we have seen on the route is below.
Across 4 months of observations from Seattle to Cardiff, the lowest round-trip fare we recorded was $937, in September. The typical fare was $1056. September was the cheapest month we saw and July the dearest.
The most recent price we saw on this route was $1028 on Delta and KLM, seen Oct 28. It is an unverified observation and may have changed.
See every deal <a href="/from/seattle">from Seattle</a>, <a href="/to/cardiff">to Cardiff</a>, or the return direction <a href="/from/cardiff/to/seattle">Cardiff to Seattle</a>.
Latest price we saw: Seattle to Cardiff
The most recent round-trip fare our sweep found on this route. It is not verified and may have changed since the date shown.
| From | Price | Per mile | Travel dates | Airline | Seen | Check price |
|---|---|---|---|---|---|---|
| Seattle (SEA) to Cardiff (CWL) | $1028 | 10.9¢ | Jan 25 – Feb 1 | Delta and KLM | Oct 28 | Check price |
Price history: Seattle to Cardiff
What we observed by month, from our signals database. Unverified observations, not bookable prices.
| Month | Low | Typical | Sightings |
|---|---|---|---|
| Oct 2026 | $1016 | $1050 | 87 |
| Sep 2026 | $937 | $996 | 107 |
| Aug 2026 | $1043 | $1088 | 141 |
| Jul 2026 | $1092 | $1092 | 3 |
Frequently asked questions
How many flight deals from Seattle to Cardiff are on Sparkflights right now?
There are 0 verified deals from Seattle to Cardiff on the board right now. The list refreshes hourly.
What is the lowest price ever seen from Seattle to Cardiff?
The lowest fare we've recorded from Seattle to Cardiff is $937, based on 338 price observations over 4 months.
How much does a flight from Seattle to Cardiff cost?
The typical round-trip fare we observed from Seattle to Cardiff is $1056, against a recorded low of $937. These are observations, not quotes.
When is the cheapest month to fly Seattle to Cardiff?
September was the cheapest month we observed from Seattle to Cardiff and July the dearest, over 4 months of data.
What is the current price from Seattle to Cardiff?
The most recent fare our sweep saw from Seattle to Cardiff is $1028, on Oct 28. It is an unverified observation rather than a verified deal, so check it before booking.