Hi Summay, you don't say when you are thinking of traveling, which can be a big factor in determining transatlantic airfares. Traveling in high season (ie, summer, Christmas) can mean fares as high as $800-$900. Usually, the shoulder- and off-seasons will see sales that can drop r/t prices to around $500-$600. Airlines will usually start advertising for shoulder-season fares right around now for travel to Europe in September-October. Luckily, there are loads of flights between New York and London, meaning there's lots of competition for passengers and so you should be able to find some good deals. If you're flexible about when you travel, you'll be in good shape to find the lowest prices. If you do a search on Away.com's Compare Rates tool (http://away.com/plan-a-trip/compare-rates.html), you'll find flights for a mid-September trip are currently running at around $650. You can probably get a lower price if you wait till last-minute or travel later in the off-season.