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Cheap flights from Helena to Washington, D.C. from $241

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 10/28. 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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Cheap round-trip flights

Alaska Airlines Logo
6:13 pm - 4:40 pmHLN-IAD
20h 27m1 stop
Alaska Airlines Logo
7:35 am - 5:51 pmIAD-HLN
12h 16m1 stop
$432Alaska Airlines
Find Deal
Wed, Nov 19 - Fri, Dec 5
United Airlines Logo
2:44 pm - 11:22 pmHLN-IAD
6h 38m1 stop
United Airlines Logo
3:59 pm - 9:22 pmIAD-HLN
7h 23m1 stop
$452United Airlines
Find Deal
Wed, Oct 22 - Mon, Oct 27
Alaska Airlines Logo
7:32 pm - 6:18 amHLN-IAD
8h 46m1 stop
Alaska Airlines Logo
7:35 am - 5:51 pmIAD-HLN
12h 16m1 stop
$462Alaska Airlines
Find Deal
Sat, Nov 22 - Fri, Dec 5
Alaska Airlines Logo
6:13 pm - 6:23 amHLN-IAD
10h 10m1 stop
Alaska Airlines Logo
7:35 am - 5:51 pmIAD-HLN
12h 16m1 stop
$472Alaska Airlines
Find Deal
Wed, Nov 19 - Wed, Dec 3
Alaska Airlines Logo
7:32 pm - 6:18 amHLN-IAD
8h 46m1 stop
Alaska Airlines Logo
7:35 am - 5:51 pmIAD-HLN
12h 16m1 stop
$483Alaska Airlines
Find Deal
Sun, Nov 23 - Fri, Dec 5
Delta Logo
1:00 pm - 11:33 pmHLN-IAD
8h 33m1 stop
Delta Logo
7:10 am - 12:26 pmIAD-HLN
7h 16m1 stop
$491Delta
Find Deal
Thu, Nov 6 - Sun, Nov 9
United Airlines Logo
6:30 am - 7:08 pmHLN-IAD
10h 38m1 stop
United Airlines Logo
10:10 pm - 1:47 pmIAD-HLN
17h 37m1 stop
$497United Airlines
Find Deal
Wed, Dec 10 - Sat, Dec 13
Delta Logo
5:33 am - 7:27 pmHLN-IAD
11h 54m2 stops
Delta Logo
7:05 am - 12:26 pmIAD-HLN
7h 21m1 stop
$502Delta
Find Deal
Wed, Nov 19 - Wed, Dec 3
United Airlines Logo
2:44 pm - 11:22 pmHLN-IAD
6h 38m1 stop
United Airlines Logo
2:25 pm - 9:22 pmIAD-HLN
8h 57m1 stop
$508United Airlines
Find Deal
Wed, Oct 22 - Mon, Oct 27
Delta Logo
5:33 am - 12:18 amHLN-IAD
16h 45m2 stops
Delta Logo
7:05 am - 12:26 pmIAD-HLN
7h 21m1 stop
$512Delta
Find Deal
Thu, Nov 20 - Wed, Dec 3

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
Oct 22
HLN2:44 pmHelena
6h 38m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Oct 27
IAD3:59 pmWashington, D.C. Dulles Intl
7h 23m
1 stop
HLN9:22 pmHelena
$452
Find similar
United Airlines
Dec 10
HLN6:30 amHelena
10h 38m
1 stop
IAD7:08 pmWashington, D.C. Dulles Intl
Dec 13
IAD10:10 pmWashington, D.C. Dulles Intl
17h 37m
1 stop
HLN1:47 pmHelena
$497
Find similar
United Airlines
Oct 22
HLN2:44 pmHelena
6h 38m
1 stop
IAD11:22 pmWashington, D.C. Dulles Intl
Oct 27
IAD2:25 pmWashington, D.C. Dulles Intl
8h 57m
1 stop
HLN9:22 pmHelena
$508
Find similar

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

Our best Delta deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
Delta
Nov 6
HLN1:00 pmHelena
8h 33m
1 stop
IAD11:33 pmWashington, D.C. Dulles Intl
Nov 9
IAD7:10 amWashington, D.C. Dulles Intl
7h 16m
1 stop
HLN12:26 pmHelena
$491
Find similar
Delta
Nov 19
HLN5:33 amHelena
11h 54m
2 stops
IAD7:27 pmWashington, D.C. Dulles Intl
Dec 3
IAD7:05 amWashington, D.C. Dulles Intl
7h 21m
1 stop
HLN12:26 pmHelena
$502
Find similar
Delta
Nov 20
HLN5:33 amHelena
16h 45m
2 stops
IAD12:18 amWashington, D.C. Dulles Intl
Dec 3
IAD7:05 amWashington, D.C. Dulles Intl
7h 21m
1 stop
HLN12:26 pmHelena
$512
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 September 11, 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

Wed 11/19

6:13 pm-4:40 pm

1 stop20h 27m

Washington, D.C. Dulles Intl

Fri 12/5

7:35 am-5:51 pm

1 stop12h 16m

$432

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 10/22

2:44 pm-11:22 pm

1 stop6h 38m

Washington, D.C. Dulles Intl

Mon 10/27

3:59 pm-9:22 pm

1 stop7h 23m

$452

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 11/22

7:32 pm-6:18 am

1 stop8h 46m

Washington, D.C. Dulles Intl

Fri 12/5

7:35 am-5:51 pm

1 stop12h 16m

$462

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 11/19

6:13 pm-6:23 am

1 stop10h 10m

Washington, D.C. Dulles Intl

Wed 12/3

7:35 am-5:51 pm

1 stop12h 16m

$472

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 11/23

7:32 pm-6:18 am

1 stop8h 46m

Washington, D.C. Dulles Intl

Fri 12/5

7:35 am-5:51 pm

1 stop12h 16m

$483

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 11/6

1:00 pm-11:33 pm

1 stop8h 33m

Washington, D.C. Dulles Intl

Sun 11/9

7:10 am-12:26 pm

1 stop7h 16m

$491

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 12/10

6:30 am-7:08 pm

1 stop10h 38m

Washington, D.C. Dulles Intl

Sat 12/13

10:10 pm-1:47 pm

1 stop17h 37m

$497

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 11/19

5:33 am-7:27 pm

2 stops11h 54m

Washington, D.C. Dulles Intl

Wed 12/3

7:05 am-12:26 pm

1 stop7h 21m

$502

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 10/22

2:44 pm-11:22 pm

1 stop6h 38m

Washington, D.C. Dulles Intl

Mon 10/27

2:25 pm-9:22 pm

1 stop8h 57m

$508

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 11/20

5:33 am-12:18 am

2 stops16h 45m

Washington, D.C. Dulles Intl

Wed 12/3

7:05 am-12:26 pm

1 stop7h 21m

$512

Flights are sorted by cheapest round-trip flights first.

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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

Direct flights

None
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 38m.

  • 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 many operators does momondo search for flights from Helena Airport to Washington, D.C. Dulles Intl Airport?

  • 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.

  • What is the most popular airline from Helena to Washington, D.C. Dulles Intl Airport?

Best airlines flying from Helena to Washington, D.C. Dulles Intl Airport

Compare and see reviews for airlines that fly from Helena to Washington, D.C. Dulles Intl Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $344Free CancellationRating
7.4
8,937 reviews
Search United Airlines flights

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

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

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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