Route guide

Cheap Flights from Washington to London

Compare live fares, then book straight with the provider. EAZAIR never adds a fee.

IAD to LHR · 7h 15m est.

IAD to LHR
7h 15m nonstop (estimated)

Washington to London flight insights

Average flight time

7h 15m

IAD → LHR

Cheapest month

January

Based on cached fare history

Cheapest cached price

Search above

This route's cached fare has never been refreshed. Search above for a live price.

Planning a trip from Washington to London? The average flight time on this route is 7h 15m. Search above to compare current fares from our booking partners. January is the cheapest month recorded for this route in our cached fare data.

Washington to London at a glance

Route Quick Facts

Quick facts for flights from Washington to London on Eazair
Origin	Washington (IAD)
Destination	London (LHR)
Average Flight Time	7h 15m
Cheapest Month to Fly	January
Current Lowest Fare	Search live fares above for a current price.

Flight deals from Washington to London

Compare flight deals from Washington to London. We search our partner travel sites to find you a good price. Fares on this route are refreshed from our partner network, and you book directly with the provider. EAZAIR never adds a fee.

Airports for Washington to London flights

Departure · Washington

Washington Dulles International (IAD)

Eastern Time

Other airports near Washington: Ronald Reagan Washington National (DCA), Baltimore/Washington International (BWI)

Arrival · London

Heathrow (LHR)

Other airports near London: Gatwick (LGW), Stansted (STN), Luton (LTN), London City (LCY)

Frequently asked questions

How long is the flight from Washington to London?

The average flight time for this route is 7h 15m. Itineraries with a connection usually run longer depending on layover length and airline.

What is the cheapest month to fly to London?

January is the cheapest month recorded for this route in our cached fare data.

Airline bag fees

Baggage allowances differ significantly between fare classes (Basic/Light vs. Standard/Flex) and can change over time. Always verify the exact allowance for your specific fare with the airline before you fly.

Checked bag fees from each airline's own website
Airline	Carry-on, basic economy	1st checked bag	2nd checked bag	Source
American Airlines	Included	$45	$55	aa.com, Sep 24, 2026
United Airlines	Not included	$40	$50	united.com, Sep 24, 2026
Delta Air Lines	Included	$45	$55	delta.com, Sep 24, 2026
Southwest Airlines	Included	$45	$55	southwest.com, Oct 27, 2026
JetBlue	Included	$45	$59	jetblue.com, Sep 24, 2026
Alaska Airlines	Included	$45	$55	alaskaair.com, Sep 24, 2026
Frontier Airlines	Not included	Varies	Varies	flyfrontier.com, Sep 24, 2026
Sun Country Airlines	Not included	Varies	Varies	suncountry.com, Sep 24, 2026

Domestic US fees per bag, each way, when paid online in advance. "Varies" means the airline prices bags by route and date.

Travel tips

Arrive early for domestic flights

TSA generally recommends arriving at least 2 hours before a domestic departure, more at larger hub airports during peak travel periods.

Pack a mixed carry-on

Keep a change of clothes, chargers, and any essentials in your carry-on rather than only your checked bag, in case of a delay or a bag that doesn't arrive with you.

Ease jet lag on longer routes

On longer cross-country flights, adjusting your sleep schedule a day or two before departure and staying hydrated in flight can reduce jet lag on arrival.

Screenshot your confirmation

Save a screenshot or PDF of your booking confirmation and boarding pass before you travel, in case you lose signal or battery at the airport.

Check in online when it opens

Most airlines open online check-in 24 hours before departure. Checking in early can help with seat selection and, on some airlines, boarding group assignment.