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Cheap flights from Helena to Washington, D.C. from $210

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 2/27. 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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Cheap round-trip flights

Enter your travel dates to find the best prices.
United Airlines Logo
2:25 pm - 11:19 pm
HLN
-
IAD
6h 54m
1 stop
United Airlines Logo
2:12 pm - 9:25 pm
IAD
-
HLN
9h 13m
1 stop
$359United Airlines
Tue, Mar 3 - Tue, Mar 10
United Airlines Logo
2:25 pm - 11:19 pm
HLN
-
IAD
6h 54m
1 stop
United Airlines Logo
2:12 pm - 9:25 pm
IAD
-
HLN
9h 13m
1 stop
$389United Airlines
Tue, Mar 3 - Mon, Mar 9
United Airlines Logo
6:15 am - 3:44 pm
HLN
-
IAD
7h 29m
1 stop
United Airlines Logo
8:20 am - 1:38 pm
IAD
-
HLN
7h 18m
1 stop
$404United Airlines
Tue, Feb 24 - Tue, Mar 10
Alaska Airlines Logo
4:36 pm - 5:40 am
HLN
-
IAD
11h 04m
1 stop
Alaska Airlines Logo
7:05 am - 3:59 pm
IAD
-
HLN
10h 54m
1 stop
$449Alaska Airlines
Sun, Mar 1 - Thu, Mar 5
United Airlines Logo
2:25 pm - 11:19 pm
HLN
-
IAD
6h 54m
1 stop
United Airlines Logo
4:03 pm - 9:25 pm
IAD
-
HLN
7h 22m
1 stop
$477United Airlines
Tue, Mar 3 - Sun, Mar 8
United Airlines Logo
6:15 am - 4:47 pm
HLN
-
IAD
8h 32m
1 stop
United Airlines Logo
2:12 pm - 9:16 pm
IAD
-
HLN
9h 04m
1 stop
$479United Airlines
Tue, Feb 24 - Mon, Mar 2
Alaska Airlines Logo
4:43 pm - 7:34 am
HLN
-
IAD
12h 51m
1 stop
Alaska Airlines Logo
5:33 pm - 4:06 pm
IAD
-
HLN
24h 33m
1 stop
$491Alaska Airlines
Wed, May 13 - Sat, May 16
Alaska Airlines Logo
4:59 pm - 7:32 am
HLN
-
IAD
12h 33m
1 stop
Alaska Airlines Logo
6:05 am - 4:22 pm
IAD
-
HLN
12h 17m
1 stop
$504Alaska Airlines
Sat, Jun 13 - Wed, Jun 17
Alaska Airlines Logo
4:36 pm - 5:40 am
HLN
-
IAD
11h 04m
1 stop
Alaska Airlines Logo
6:20 pm - 3:59 pm
IAD
-
HLN
23h 39m
2 stops
$506Alaska Airlines
Sun, Mar 1 - Thu, Mar 5
Alaska Airlines Logo
4:43 pm - 7:34 am
HLN
-
IAD
12h 51m
1 stop
Alaska Airlines Logo
6:42 pm - 4:06 pm
IAD
-
HLN
23h 24m
2 stops
$516Alaska Airlines
Thu, May 14 - Mon, May 18

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
Feb 19
HLN1:10 pmHelena
8h 36m
1 stop
IAD11:46 pmWashington, D.C. Dulles Intl
Feb 23
IAD12:38 pmWashington, D.C. Dulles Intl
11h 49m
2 stops
HLN10:27 pmHelena
$489
Delta
Feb 19
HLN1:10 pmHelena
9h 11m
2 stops
IAD12:21 amWashington, D.C. Dulles Intl
Feb 23
IAD12:38 pmWashington, D.C. Dulles Intl
11h 49m
2 stops
HLN10:27 pmHelena
$494
Delta
Feb 16
HLN1:10 pmHelena
8h 36m
1 stop
IAD11:46 pmWashington, D.C. Dulles Intl
Feb 23
IAD12:38 pmWashington, D.C. Dulles Intl
11h 49m
2 stops
HLN10:27 pmHelena
$569

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

Our best Alaska Airlines deals on Helena to Washington, D.C. Dulles Intl Airport flight tickets
Alaska Airlines
Mar 1
HLN4:36 pmHelena
11h 04m
1 stop
IAD5:40 amWashington, D.C. Dulles Intl
Mar 5
IAD7:05 amWashington, D.C. Dulles Intl
10h 54m
1 stop
HLN3:59 pmHelena
$449
Alaska Airlines
May 13
HLN4:43 pmHelena
12h 51m
1 stop
IAD7:34 amWashington, D.C. Dulles Intl
May 16
IAD5:33 pmWashington, D.C. Dulles Intl
24h 33m
1 stop
HLN4:06 pmHelena
$491
Alaska Airlines
Jun 13
HLN4:59 pmHelena
12h 33m
1 stop
IAD7:32 amWashington, D.C. Dulles Intl
Jun 17
IAD6:05 amWashington, D.C. Dulles Intl
12h 17m
1 stop
HLN4:22 pmHelena
$504

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 February 15, 2026.
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

Tue 3/3

2:25 pm-11:19 pm

1 stop6h 54m

Washington, D.C. Dulles Intl

Tue 3/10

2:12 pm-9:25 pm

1 stop9h 13m

$359

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 3/3

2:25 pm-11:19 pm

1 stop6h 54m

Washington, D.C. Dulles Intl

Mon 3/9

2:12 pm-9:25 pm

1 stop9h 13m

$389

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 2/24

6:15 am-3:44 pm

1 stop7h 29m

Washington, D.C. Dulles Intl

Tue 3/10

8:20 am-1:38 pm

1 stop7h 18m

$404

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 3/1

4:36 pm-5:40 am

1 stop11h 04m

Washington, D.C. Dulles Intl

Thu 3/5

7:05 am-3:59 pm

1 stop10h 54m

$449

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 3/3

2:25 pm-11:19 pm

1 stop6h 54m

Washington, D.C. Dulles Intl

Sun 3/8

4:03 pm-9:25 pm

1 stop7h 22m

$477

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 2/24

6:15 am-4:47 pm

1 stop8h 32m

Washington, D.C. Dulles Intl

Mon 3/2

2:12 pm-9:16 pm

1 stop9h 04m

$479

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 5/13

4:43 pm-7:34 am

1 stop12h 51m

Washington, D.C. Dulles Intl

Sat 5/16

5:33 pm-4:06 pm

1 stop24h 33m

$491

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 6/13

4:59 pm-7:32 am

1 stop12h 33m

Washington, D.C. Dulles Intl

Wed 6/17

6:05 am-4:22 pm

1 stop12h 17m

$504

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sun 3/1

4:36 pm-5:40 am

1 stop11h 04m

Washington, D.C. Dulles Intl

Thu 3/5

6:20 pm-3:59 pm

2 stops23h 39m

$506

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Thu 5/14

4:43 pm-7:34 am

1 stop12h 51m

Washington, D.C. Dulles Intl

Mon 5/18

6:42 pm-4:06 pm

2 stops23h 24m

$516

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 resultsSorted by cheapest 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 airline that flies from Helena to Washington, D.C. Dulles Intl?

Delta and United Airlines are the most popular carriers operating from Helena to Washington, D.C. Dulles Intl

What airlines fly to Washington, D.C. Dulles Intl Airport?

United Airlines, Delta and Southwest are the top three most popular airlines that fly to Washington, D.C. Dulles Intl Airport from Helena according to our data. United Airlines is the first choice among our users, with 67% of people opting to fly with this airline when traveling to Washington, D.C. Dulles Intl Airport. Keep in mind that there are 4 different airlines that fly to Washington, D.C. Dulles Intl Airport on a routine basis, so you have a few additional options to choose from.

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

8h 32m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Dulles Intl Airport takes 8h 32m
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.
Search flight deals

  • 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 8h 32m.

  • 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
Laurel
Colonial Beach
Tysons
Silver Spring
Towson
Fredericksburg
Gaithersburg
Rockville
Manassas
Springfield
Sterling
Fairfax
Linthicum Heights

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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