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Cheap flights from Helena to Washington, D.C. from $268

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Helena to Washington, D.C. departing on 5/10. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
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0 bags

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Find the cheapest flights from Helena to Washington, D.C.

Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
6:15 am - 4:35 pm
HLN
-
IAD
8h 20m1 stop
United Airlines Logo
5:45 pm - 9:26 pm
IAD
-
HLN
29h 41m2 stops
$628United Airlines
Thu, Jan 8 - Mon, Jan 12
United Airlines Logo
2:27 pm - 11:22 pm
HLN
-
IAD
6h 55m1 stop
United Airlines Logo
8:15 am - 9:26 pm
IAD
-
HLN
15h 11m2 stops
$643United Airlines
Thu, Jan 8 - Mon, Jan 12
United Airlines Logo
2:27 pm - 7:28 am
HLN
-
IAD
15h 01m2 stops
United Airlines Logo
8:15 am - 9:26 pm
IAD
-
HLN
15h 11m2 stops
$663United Airlines
Thu, Jan 8 - Mon, Jan 12

United Airlines flights from Helena to Washington, D.C. Dulles Intl Airport

Our best United Airlines deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
United Airlines
Jan 8
HLN6:15 amHelena
8h 20m
1 stop
IAD4:35 pmWashington, D.C. Dulles Intl
Jan 12
IAD5:45 pmWashington, D.C. Dulles Intl
29h 41m
2 stops
HLN9:26 pmHelena
$628
Find similar
United Airlines
Jan 8
HLN2:27 pmHelena
6h 55m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Jan 12
IAD8:15 amWashington, D.C. Dulles Intl
15h 11m
2 stops
HLN9:26 pmHelena
$643
Find similar
United Airlines
Jan 8
HLN2:27 pmHelena
15h 01m
2 stops
IAD7:28 amWashington, D.C. Dulles Intl
Jan 12
IAD8:15 amWashington, D.C. Dulles Intl
15h 11m
2 stops
HLN9:26 pmHelena
$663
Find similar

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Washington, D.C. Dulles Intl Airport that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, momondo users made 832,500 searches. Data last updated December 23, 2025.
Use the filters below to find and compare flights from Helena to Washington, D.C. Dulles Intl Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 1/8

6:15 am-4:35 pm

1 stop8h 20m

Washington, D.C. Dulles Intl

Mon 1/12

5:45 pm-9:26 pm

2 stops29h 41m

$628

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 1/8

2:27 pm-11:22 pm

1 stop6h 55m

Washington, D.C. Dulles Intl

Mon 1/12

8:15 am-9:26 pm

2 stops15h 11m

$643

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 1/8

2:27 pm-7:28 am

2 stops15h 01m

Washington, D.C. Dulles Intl

Mon 1/12

8:15 am-9:26 pm

2 stops15h 11m

$663

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 5/10

6:22 pm-5:50 am

1 stop9h 28m

$268

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 5/10

6:15 am-11:20 am

2 stops27h 05m

$459

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 5/10

6:15 am-11:57 pm

3 stops15h 42m

$1,224

Flights are sorted by cheapest round-trip flights first.

Sorted by cheapest first

See travel insights to Washington, D.C. from

How to get the cheapest flight ticket from Helena to Washington, D.C. Dulles Intl Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

What is the cheapest day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Our data shows that Wednesday is the least expensive day to fly to Washington, D.C. Dulles Intl Airport. Tickets to fly out on this day can be as low as $434. When flying out on a Tuesday, the most expensive travel day of the week, you can expect to see flight prices from Helena to Washington, D.C. Dulles Intl Airport for around $458.

What is the cheapest time of day to depart on your flight to Washington, D.C. Dulles Intl Airport?

Flying to Washington, D.C. Dulles Intl Airport from Helena at noon is the least expensive time of day to depart. momondo users have found prices as low as $434 when looking at flights departing at noon. If you have a flexible travel schedule, then try to avoid flying in the morning when prices are $563 on average. Flights to Washington, D.C. Dulles Intl Airport from Helena in the morning are generally more expensive because this time of day is more convenient for travelers’ schedules.

When to book flights from Helena to Washington, D.C. Dulles Intl Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Washington, D.C. Dulles Intl Airport according to our flight data. Find out which month and days have the cheapest flights.
Estimated round-trip price

Cheap Helena to Washington, D.C. Dulles Intl Airport (HLN to IAD) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Helena to Washington, D.C. Dulles Intl Airport

Fastest flight time

6h 57m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Dulles Intl Airport takes 6h 57m
There are no direct flights from Helena to Washington, D.C. Dulles Intl Airport. There are no popular flight routes from Helena to Washington, D.C. Dulles Intl Airport.
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  • How far is Helena to Washington, D.C. Dulles Intl by plane?

    Helena and Washington, D.C. Dulles Intl are 1814.3 mi apart from one another. By plane, this route typically takes 6h 57m.

  • When did momondo last update prices for flights from Helena Airport to Washington, D.C. Dulles Intl Airport?

    Prices for flights from Helena Airport to Washington, D.C. Dulles Intl Airport were last updated today.

  • How old do you have to be to fly from Helena Airport to Washington, D.C. Dulles Intl Airport?

    The minimum age for a child to fly alone is five, but airlines that offer an unaccompanied minor (UNMR) service may have their own age limitations. Flight duration, scheduling, and layovers are among the considerations that may influence age limits. We recommend that you double-check with the airline you are booking with for travel from Helena Airport to Washington, D.C. Dulles Intl Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Dulles Intl Airport?

    The necessary travel and health documents for your Washington, D.C. Dulles Intl Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
Alexandria
National Harbor
Gettysburg
Arlington
Winchester
Waldorf
Woodbridge
Tysons
Laurel
Colonial Beach
Silver Spring
Fredericksburg
Towson
Rockville
Harpers Ferry
Gaithersburg
Reston
Manassas
Sterling
Fairfax

Why use momondo?

Why should I use momondo to find a flight deal from Helena to Washington, D.C.?

We help find the flight that best suits your needs, momondo compares prices from hundreds of airlines and travel agents and helps you filter them to find the best flight from Helena to Washington, D.C. for you.

Can I find flights from Helena to Washington, D.C. with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to Washington, D.C. from Helena with this policy.

How can momondo help me find flights from Helena to Washington, D.C.?

Once you have performed a search in the form on the page, momondo provides useful filters and insights. We can show you the cheapest days and times to fly as well as help filter your options to help you make an informed choice when booking flights to Washington, D.C. from Helena.

I’m not ready to book a flight from Helena to Washington, D.C. right now. Can momondo alert me if prices change?

If you are simply researching potential flights to Washington, D.C., momondo offers a useful price alert feature which will track prices for flights to Washington, D.C. from Helena and alert you when they change.

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