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Cheap flights from Helena to Washington, D.C. from $271

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 8/22. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.
1 adult
1 adult, Economy, 0 bags

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

Cheap round-trip flights

Enter your travel dates to find the best prices.
Delta Logo
1:03 pm - 11:35 pm
HLN
-
IAD
8h 32m
1 stop
Delta Logo
7:00 am - 12:23 pm
IAD
-
HLN
7h 23m
1 stop
$404Delta
Wed, Oct 7 - Thu, Oct 22
Alaska Airlines Logo
4:48 pm - 5:40 am
HLN
-
IAD
10h 52m
1 stop
Alaska Airlines Logo
7:00 am - 4:11 pm
IAD
-
HLN
11h 11m
1 stop
$409Alaska Airlines
Tue, Oct 6 - Sat, Oct 10
Alaska Airlines Logo
4:48 pm - 5:40 am
HLN
-
IAD
10h 52m
1 stop
Alaska Airlines Logo
9:35 am - 4:11 pm
IAD
-
HLN
8h 36m
1 stop
$419Alaska Airlines
Mon, Oct 5 - Sat, Oct 10
Delta Logo
12:57 pm - 4:21 pm
HLN
-
IAD
25h 24m
2 stops
Delta Logo
7:00 am - 12:23 pm
IAD
-
HLN
7h 23m
1 stop
$422Delta
Mon, Oct 5 - Sat, Oct 10
Delta Logo
1:03 pm - 12:31 am
HLN
-
IAD
9h 28m
2 stops
Delta Logo
7:00 am - 12:23 pm
IAD
-
HLN
7h 23m
1 stop
$429Delta
Wed, Oct 7 - Wed, Oct 21
Delta Logo
1:03 pm - 10:17 am
HLN
-
IAD
19h 14m
2 stops
Delta Logo
7:00 am - 12:23 pm
IAD
-
HLN
7h 23m
1 stop
$457Delta
Tue, Oct 6 - Sat, Oct 10
Delta Logo
12:57 pm - 11:33 pm
HLN
-
IAD
8h 36m
1 stop
Delta Logo
7:00 am - 12:17 pm
IAD
-
HLN
7h 17m
1 stop
$459Delta
Tue, Sep 29 - Fri, Oct 2
Alaska Airlines Logo
4:41 pm - 4:14 pm
HLN
-
IAD
21h 33m
1 stop
Alaska Airlines Logo
7:46 am - 4:04 pm
IAD
-
HLN
10h 18m
1 stop
$471Alaska Airlines
Sat, Nov 14 - Tue, Nov 17
Alaska Airlines Logo
4:48 pm - 5:40 am
HLN
-
IAD
10h 52m
1 stop
Alaska Airlines Logo
7:00 am - 4:11 pm
IAD
-
HLN
11h 11m
1 stop
$474Alaska Airlines
Tue, Oct 6 - Thu, Oct 8
Alaska Airlines Logo
4:48 pm - 2:18 pm
HLN
-
IAD
19h 30m
2 stops
Alaska Airlines Logo
7:00 am - 4:11 pm
IAD
-
HLN
11h 11m
1 stop
$480Alaska Airlines
Tue, Oct 6 - Wed, Oct 21

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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
Oct 7
HLN1:03 pmHelena
8h 32m
1 stop
IAD11:35 pmWashington, D.C. Dulles Intl
Oct 20
IAD7:00 amWashington, D.C. Dulles Intl
7h 23m
1 stop
HLN12:23 pmHelena
$404
Delta
Oct 5
HLN12:57 pmHelena
25h 24m
2 stops
IAD4:21 pmWashington, D.C. Dulles Intl
Oct 10
IAD7:00 amWashington, D.C. Dulles Intl
7h 23m
1 stop
HLN12:23 pmHelena
$422
Delta
Oct 7
HLN1:03 pmHelena
9h 28m
2 stops
IAD12:31 amWashington, D.C. Dulles Intl
Oct 20
IAD7:00 amWashington, D.C. Dulles Intl
7h 23m
1 stop
HLN12:23 pmHelena
$429

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
Oct 6
HLN4:48 pmHelena
10h 52m
1 stop
IAD5:40 amWashington, D.C. Dulles Intl
Oct 10
IAD7:00 amWashington, D.C. Dulles Intl
11h 11m
1 stop
HLN4:11 pmHelena
$409
Alaska Airlines
Oct 5
HLN4:48 pmHelena
10h 52m
1 stop
IAD5:40 amWashington, D.C. Dulles Intl
Oct 10
IAD7:00 amWashington, D.C. Dulles Intl
11h 11m
1 stop
HLN4:11 pmHelena
$419
Alaska Airlines
Nov 14
HLN4:41 pmHelena
21h 33m
1 stop
IAD4:14 pmWashington, D.C. Dulles Intl
Nov 17
IAD7:46 amWashington, D.C. Dulles Intl
10h 18m
1 stop
HLN4:04 pmHelena
$471

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 July 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

Cheapest round-trip

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 10/7

1:03 pm-11:35 pm

1 stop8h 32m

Washington, D.C. Dulles Intl

Thu 10/22

7:00 am-12:23 pm

1 stop7h 23m

$404

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 10/6

4:48 pm-5:40 am

1 stop10h 52m

Washington, D.C. Dulles Intl

Sat 10/10

7:00 am-4:11 pm

1 stop11h 11m

$409

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Mon 10/5

4:48 pm-5:40 am

1 stop10h 52m

Washington, D.C. Dulles Intl

Sat 10/10

9:35 am-4:11 pm

1 stop8h 36m

$419

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Mon 10/5

12:57 pm-4:21 pm

2 stops25h 24m

Washington, D.C. Dulles Intl

Sat 10/10

7:00 am-12:23 pm

1 stop7h 23m

$422

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Wed 10/7

1:03 pm-12:31 am

2 stops9h 28m

Washington, D.C. Dulles Intl

Wed 10/21

7:00 am-12:23 pm

1 stop7h 23m

$429

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 10/6

1:03 pm-10:17 am

2 stops19h 14m

Washington, D.C. Dulles Intl

Sat 10/10

7:00 am-12:23 pm

1 stop7h 23m

$457
Quickest round-trip

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 9/29

12:57 pm-11:33 pm

1 stop8h 36m

Washington, D.C. Dulles Intl

Fri 10/2

7:00 am-12:17 pm

1 stop7h 17m

$459

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Sat 11/14

4:41 pm-4:14 pm

1 stop21h 33m

Washington, D.C. Dulles Intl

Tue 11/17

7:46 am-4:04 pm

1 stop10h 18m

$471

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 10/6

4:48 pm-5:40 am

1 stop10h 52m

Washington, D.C. Dulles Intl

Thu 10/8

7:00 am-4:11 pm

1 stop11h 11m

$474

HelenaWashington, D.C.

HLN - IAD

HLNIAD

Helena

Tue 10/6

4:48 pm-2:18 pm

2 stops19h 30m

Washington, D.C. Dulles Intl

Wed 10/21

7:00 am-4:11 pm

1 stop11h 11m

$480

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 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?

Alaska Airlines and Delta 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, Alaska Airlines 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 65% 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

7h 12m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Dulles Intl Airport takes 7h 12m
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

Frequently asked questions about flying from Helena to Washington, D.C. Dulles Intl Airport

  • 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 7h 12m.

  • 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
Arlington
Gettysburg
Winchester
Waldorf
Laurel
Woodbridge
Fredericksburg
Gaithersburg
Linthicum Heights
Rockville
Towson
Manassas
Silver Spring
Colonial Beach
Sterling
Springfield
Tysons
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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