Title:  Cheap Singapore Airlines flights from London to Washington (LHR→IAD) - Expedia.co.uk

![Washington DC in Spring](https://images.trvl-media.com/place/3763/58eb1a51-e7f1-4f17-88af-21174d495e42.jpg?impolicy=fcrop&w=1200&h=500&q=medium)

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#  Cheap Singapore Airlines flights from London to Washington (LHR→IAD)

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## Alternative airports near Washington

Prices were available within the past 7 days. Prices and availability are subject to change.

[](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:DCA,departure:17/04/2026TANYT&leg2=from:DCA,to:LHR,departure:19/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE)

DCA

Ronald Reagan Washington National

Closest

8 min

[Flights from £587

](https://www.expedia.co.uk/Flights-Search?leg1=from:LHR,to:DCA,departure:17/04/2026TANYT&leg2=from:DCA,to:LHR,departure:19/04/2026TANYT&trip=roundtrip&passengers=adults:1,children:0,infantinlap:N&mode=search&pageId=0&sortOrder=INCREASING&sortType=PRICE) 

## Find the cheapest month to fly from London (LHR) to Washington (IAD)

### February is typically the cheapest month to fly

From £352 - £590 per traveller.

## Travel information

| Origin airport      | Heathrow                                                                                                                                                                                                                                                                                     |
| ------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| Destination airport | Washington Dulles Intl.                                                                                                                                                                                                                                                                      |
| Airlines serving    | Aer Lingus, Air Canada, Air France, American Airlines, Austrian Airlines, British Airways, Brussels Airlines, Delta, Finnair, ITA Airways, Iberia, Icelandair, KLM, Lufthansa, Scandinavian Airlines, Swiss International Air Lines, TAP Portugal, Turkish Airlines, United, Virgin Atlantic |
| Popular airline     | KLM                                                                                                                                                                                                                                                                                          |
| Distance            | 5866 km                                                                                                                                                                                                                                                                                      |
| Average flight time | 3 hours 11 mins                                                                                                                                                                                                                                                                              |

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