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Cheap flights from Helena to Washington, D.C. from $254

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 8/14. 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.
Delta Logo
5:35 am - 6:43 pm
HLN
-
DCA
11h 08m
2 stops
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$364Delta
Thu, Aug 20 - Tue, Sep 1
Delta Logo
5:35 am - 6:43 pm
HLN
-
DCA
11h 08m
2 stops
Delta Logo
6:00 am - 12:23 pm
DCA
-
HLN
8h 23m
2 stops
$369Delta
Thu, Aug 20 - Tue, Sep 1
Delta Logo
5:35 am - 6:45 pm
HLN
-
DCA
11h 10m
2 stops
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$438Delta
Wed, Aug 19 - Tue, Sep 1
Delta Logo
5:35 am - 6:45 pm
HLN
-
DCA
11h 10m
2 stops
Delta Logo
12:59 pm - 10:34 pm
DCA
-
HLN
11h 35m
2 stops
$443Delta
Wed, Aug 19 - Mon, Aug 31
Delta Logo
5:35 am - 11:09 pm
HLN
-
DCA
15h 34m
2 stops
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$463Delta
Thu, Aug 20 - Mon, Aug 31
Delta Logo
5:35 am - 11:09 pm
HLN
-
DCA
15h 34m
2 stops
Delta Logo
3:10 pm - 10:34 pm
DCA
-
HLN
9h 24m
2 stops
$469Delta
Thu, Aug 20 - Wed, Sep 2
Delta Logo
5:35 am - 6:45 pm
HLN
-
DCA
11h 10m
2 stops
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$474Delta
Thu, Aug 20 - Wed, Sep 2
Delta Logo
5:35 am - 4:19 pm
HLN
-
DCA
8h 44m
1 stop
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$499Delta
Thu, Aug 20 - Tue, Sep 1
Delta Logo
5:35 am - 6:45 pm
HLN
-
DCA
11h 10m
2 stops
Delta Logo
5:00 pm - 10:34 pm
DCA
-
HLN
7h 34m
1 stop
$504Delta
Fri, Aug 21 - Wed, Sep 2
Delta Logo
5:35 am - 6:45 pm
HLN
-
DCA
11h 10m
2 stops
Delta Logo
3:10 pm - 10:34 pm
DCA
-
HLN
9h 24m
2 stops
$509Delta
Fri, Aug 21 - Wed, Sep 2

United Airlines flights from Helena to Washington, D.C. Reagan-National Airport

Our best United Airlines deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
United Airlines
Jul 1
HLN6:15 amHelena
6h 44m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
Jul 3
DCA4:13 pmWashington, D.C. Reagan-National
7h 07m
1 stop
HLN9:20 pmHelena
$940
United Airlines
Jun 11
HLN2:20 pmHelena
30h 34m
3 stops
DCA10:54 pmWashington, D.C. Reagan-National
Jun 15
DCA8:25 pmWashington, D.C. Reagan-National
19h 08m
2 stops
HLN1:33 pmHelena
$1,040
United Airlines
Jun 11
HLN2:20 pmHelena
30h 34m
3 stops
DCA10:54 pmWashington, D.C. Reagan-National
Jun 15
DCA8:20 pmWashington, D.C. Reagan-National
19h 13m
2 stops
HLN1:33 pmHelena
$1,044

Alaska Airlines flights from Helena to Washington, D.C. Reagan-National Airport

Our best Alaska Airlines deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
Alaska Airlines
Jun 1
HLN4:43 pmHelena
15h 24m
2 stops
DCA10:07 amWashington, D.C. Reagan-National
Jun 2
DCA1:59 pmWashington, D.C. Reagan-National
28h 07m
2 stops
HLN4:06 pmHelena
$519
Alaska Airlines
Jun 1
HLN4:43 pmHelena
15h 24m
2 stops
DCA10:07 amWashington, D.C. Reagan-National
Jun 3
DCA7:36 amWashington, D.C. Reagan-National
10h 30m
2 stops
HLN4:06 pmHelena
$633
Alaska Airlines
Aug 7
HLN5:09 pmHelena
24h 51m
2 stops
DCA8:00 pmWashington, D.C. Reagan-National
Aug 10
DCA5:22 pmWashington, D.C. Reagan-National
25h 10m
2 stops
HLN4:32 pmHelena
$739

momondo Fare Finder

 
Customize your flight search to find flights from Helena to Washington, D.C. Reagan-National 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 May 11, 2026.
Use the filters below to find and compare flights from Helena to Washington, D.C. Reagan-National Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-6:43 pm

2 stops11h 08m

Washington, D.C. Reagan-National

Tue 9/1

5:00 pm-10:34 pm

1 stop7h 34m

$364

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-6:43 pm

2 stops11h 08m

Washington, D.C. Reagan-National

Tue 9/1

6:00 am-12:23 pm

2 stops8h 23m

$369

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Wed 8/19

5:35 am-6:45 pm

2 stops11h 10m

Washington, D.C. Reagan-National

Tue 9/1

5:00 pm-10:34 pm

1 stop7h 34m

$438

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Wed 8/19

5:35 am-6:45 pm

2 stops11h 10m

Washington, D.C. Reagan-National

Mon 8/31

12:59 pm-10:34 pm

2 stops11h 35m

$443

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-11:09 pm

2 stops15h 34m

Washington, D.C. Reagan-National

Mon 8/31

5:00 pm-10:34 pm

1 stop7h 34m

$463

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-11:09 pm

2 stops15h 34m

Washington, D.C. Reagan-National

Wed 9/2

3:10 pm-10:34 pm

2 stops9h 24m

$469

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-6:45 pm

2 stops11h 10m

Washington, D.C. Reagan-National

Wed 9/2

5:00 pm-10:34 pm

1 stop7h 34m

$474
Quickest round-trip

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 8/20

5:35 am-4:19 pm

1 stop8h 44m

Washington, D.C. Reagan-National

Tue 9/1

5:00 pm-10:34 pm

1 stop7h 34m

$499

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Fri 8/21

5:35 am-6:45 pm

2 stops11h 10m

Washington, D.C. Reagan-National

Wed 9/2

5:00 pm-10:34 pm

1 stop7h 34m

$504

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Fri 8/21

5:35 am-6:45 pm

2 stops11h 10m

Washington, D.C. Reagan-National

Wed 9/2

3:10 pm-10:34 pm

2 stops9h 24m

$509

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. Reagan-National 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. Reagan-National?

Delta and United Airlines are the most popular carriers operating from Helena to Washington, D.C. Reagan-National

What airlines fly to Washington, D.C. Reagan-National Airport?

Delta, United Airlines and American Airlines are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Helena according to our data. Delta is the first choice among our users, with 35% of people opting to fly with this airline when traveling to Washington, D.C. Reagan-National Airport. Keep in mind that there are 3 different airlines that fly to Washington, D.C. Reagan-National 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. Reagan-National Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Helena to Washington, D.C. Reagan-National 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. Reagan-National Airport (HLN to DCA) flight deals and tips

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

Fastest flight time

10h 55m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Reagan-National Airport takes 10h 55m
There are no direct flights from Helena to Washington, D.C. Reagan-National Airport. There are no popular flight routes from Helena to Washington, D.C. Reagan-National Airport.
Search flight deals

Frequently asked questions about flying from Helena to Washington, D.C. Reagan-National Airport

  • How far is Helena to Washington, D.C. Reagan-National by plane?

    Helena and Washington, D.C. Reagan-National are 1837.0 mi apart from one another. In terms of flight time, this usually takes a little over 10h 55m.

  • When did momondo last update prices for flights from Helena Airport to Washington, D.C. Reagan-National Airport?

    Prices for flights from Helena Airport to Washington, D.C. Reagan-National Airport are refreshed on a daily basis.

  • How many operators does momondo search for flights from Helena Airport to Washington, D.C. Reagan-National Airport?

  • How old do you have to be to fly from Helena Airport to Washington, D.C. Reagan-National Airport?

    The minimum age a child must be to fly alone is five but airlines that offer an unaccompanied minor (UNMR) service will have their own age restrictions, including rules around flight length, timings, and stopovers. We always recommend checking with the individual airline you are booking with to travel from Helena Airport to Washington, D.C. Reagan-National Airport.

  • What documentation or ID do you need to fly to Washington, D.C. Reagan-National Airport?

    The travel and health documents required for your trip to Washington, D.C. Reagan-National Airport can vary based on your itinerary and personal situation. As a rule, consider having multiple documents such as a national ID card or driver’s license, and a passport valid for six-months after you plan to arrive at Washington, D.C. Reagan-National Airport. We always recommend checking with your airline or a trusted third party such as IATA to get advice.

  • What is the most popular airline from Helena to Washington, D.C. Reagan-National Airport?

Best airlines flying from Helena to Washington, D.C. Reagan-National Airport

Compare and see reviews for airlines that fly from Helena to Washington, D.C. Reagan-National Airport with momondo
Airline
Rating
Free Cancellation
Price
United AirlinesPriceFrom $503Free CancellationRating
7.4
9,699 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
National Harbor
Gettysburg
Arlington
Waldorf
Woodbridge
Laurel
Gaithersburg
Colonial Beach
Towson
Fredericksburg
Silver Spring
Rockville
Manassas
Linthicum Heights
Tysons
Bethesda
Springfield
Fairfax
College Park

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Helena to Washington, D.C.. momondo saves you time and could save you money on your trip.

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

Yes. momondo allows you to filter the results for Helena to Washington, D.C. flights to just show those with flexible booking policies.

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

momondo helps you find the best flight between Helena and Washington, D.C. by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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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