Using Netflights, you can compare different flights from Belfast to Washington DC Ronald Reagan Washington National Airport. But if you can’t see the dates you want, or the prices are too high, try broadening your search. Washington DC Ronald Reagan Washington National Airport is just one of the airports in Washington DC, so it's worth considering other options.
You could also try searching by month, if you're flexible on dates. This will show you when prices are at their cheapest and their most expensive. Generally speaking, the earlier you book, the better deal you'll get.
Once you’ve made your flight selection, click through to the next page to complete your booking. You can also explore accommodation and car hire options in the USA by using the tabs at the top of the page.