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2 for sale now
Every 1999 Sei that comes off Autotrader, with its final asking price and how long it took to sell.
We haven't seen a 1999 Sei come off Autotrader since tracking began. Sold prices will show here as soon as one does.
What each 1999 Sei variant sold for (filled dots) and what the 2 for sale are asking (rings), with monthly medians drawn through them. Click a dot to open the car.
Solid lines: median sold price per month (3+ sales). Dashed lines: median asking price of cars currently for sale, by the month they were listed.
By month sold, all variants
How long sold cars were listed
How many cars were listed each day since tracking began
Asking price range, with the median marked
Listings added and sold each month
2 live listings from Autotrader · from £10,250 · median £10,575
Sold and asking prices against mileage. Each dot is a car; click one to open it.
What 1999 Westfield Sei cars sell for and how many are on Autotrader UK right now. Updated 20 Oct 2026.
The median asking price for a used 1999 Westfield Sei on Autotrader UK is £10,575, across 2 cars for sale as of 20 Oct 2026.
There are 2 used 1999 Westfield Sei cars for sale on Autotrader UK as of 20 Oct 2026.
Autotrender records every Westfield Sei listing on Autotrader UK twice a day and groups them by registration year. A car counts as sold when its advert is removed, and its sold price is the final asking price before it came off; days to sell run from the advert's listing date to its removal. Medians are used throughout, and figures are only stated once at least 5 sales have been recorded.
Recomputed after every Autotrader scan. Month-by-month trends across all years: Westfield Sei market report · About Autotrender