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Cheap flights from Helena to Washington, D.C. from $323

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 4/21. 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 - 2:59 pm
HLN
-
DCA
6h 44m
1 stop
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$494United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:59 pm
HLN
-
DCA
6h 44m
1 stop
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$513United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:59 pm
HLN
-
DCA
6h 44m
1 stop
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$523United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 10:47 pm
HLN
-
DCA
14h 32m
2 stops
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$593United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 2:59 pm
HLN
-
DCA
6h 44m
1 stop
United Airlines Logo
6:30 am - 9:46 pm
DCA
-
HLN
17h 16m
2 stops
$597United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 9:06 pm
HLN
-
DCA
12h 51m
2 stops
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$603United Airlines
Sat, May 2 - Tue, May 5
United Airlines Logo
6:15 am - 10:47 pm
HLN
-
DCA
14h 32m
2 stops
United Airlines Logo
4:11 pm - 9:46 pm
DCA
-
HLN
7h 35m
1 stop
$613United Airlines
Sat, May 2 - Tue, May 5
Alaska Airlines Logo
4:43 pm - 9:00 pm
HLN
-
DCA
26h 17m
2 stops
Alaska Airlines Logo
8:00 am - 4:06 pm
DCA
-
HLN
10h 06m
1 stop
$640Alaska Airlines
Thu, Jun 4 - Sun, Jun 7
United Airlines Logo
6:15 am - 2:59 pm
HLN
-
DCA
6h 44m
1 stop
United Airlines Logo
7:30 am - 1:38 pm
DCA
-
HLN
32h 08m
3 stops
$647United Airlines
Sat, May 2 - Tue, May 5
Alaska Airlines Logo
4:43 pm - 4:19 pm
HLN
-
DCA
21h 36m
1 stop
Alaska Airlines Logo
8:00 am - 4:06 pm
DCA
-
HLN
10h 06m
1 stop
$653Alaska Airlines
Thu, Jun 4 - Sun, Jun 7

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
May 2
HLN6:15 amHelena
6h 44m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
May 5
DCA4:11 pmWashington, D.C. Reagan-National
7h 35m
1 stop
HLN9:46 pmHelena
$494
United Airlines
May 2
HLN6:15 amHelena
6h 44m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
May 5
DCA4:11 pmWashington, D.C. Reagan-National
7h 35m
1 stop
HLN9:46 pmHelena
$513
United Airlines
May 2
HLN6:15 amHelena
6h 44m
1 stop
DCA2:59 pmWashington, D.C. Reagan-National
May 5
DCA4:11 pmWashington, D.C. Reagan-National
7h 35m
1 stop
HLN9:46 pmHelena
$523

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 4
HLN4:43 pmHelena
26h 17m
2 stops
DCA9:00 pmWashington, D.C. Reagan-National
Jun 7
DCA8:00 amWashington, D.C. Reagan-National
10h 06m
1 stop
HLN4:06 pmHelena
$640
Alaska Airlines
Jun 4
HLN4:43 pmHelena
21h 36m
1 stop
DCA4:19 pmWashington, D.C. Reagan-National
Jun 7
DCA8:00 amWashington, D.C. Reagan-National
10h 06m
1 stop
HLN4:06 pmHelena
$653
Alaska Airlines
Jun 4
HLN4:43 pmHelena
26h 17m
2 stops
DCA9:00 pmWashington, D.C. Reagan-National
Jun 7
DCA9:59 amWashington, D.C. Reagan-National
32h 07m
2 stops
HLN4:06 pmHelena
$827

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 April 13, 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
Quickest round-trip

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$494

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$513

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$523

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-10:47 pm

2 stops14h 32m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$593

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Tue 5/5

6:30 am-9:46 pm

2 stops17h 16m

$597

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-9:06 pm

2 stops12h 51m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$603

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-10:47 pm

2 stops14h 32m

Washington, D.C. Reagan-National

Tue 5/5

4:11 pm-9:46 pm

1 stop7h 35m

$613

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 6/4

4:43 pm-9:00 pm

2 stops26h 17m

Washington, D.C. Reagan-National

Sun 6/7

8:00 am-4:06 pm

1 stop10h 06m

$640

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 5/2

6:15 am-2:59 pm

1 stop6h 44m

Washington, D.C. Reagan-National

Tue 5/5

7:30 am-1:38 pm

3 stops32h 08m

$647

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Thu 6/4

4:43 pm-4:19 pm

1 stop21h 36m

Washington, D.C. Reagan-National

Sun 6/7

8:00 am-4:06 pm

1 stop10h 06m

$653

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 13 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 is the most popular carrier operating from Helena to Washington, D.C. Reagan-National

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

United Airlines, American Airlines and Delta are the top three most popular airlines that fly to Washington, D.C. Reagan-National Airport from Helena according to our data. United Airlines is the first choice among our users, with 37% 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

6h 44m

Direct flights

None
The fastest flight from Helena to Washington, D.C. Reagan-National Airport takes 6h 44m
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 6h 44m.

  • 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
9,579 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
Colonial Beach
Gaithersburg
Towson
Fredericksburg
Silver Spring
Rockville
Manassas
Tysons
Linthicum Heights
Bethesda
Fairfax
Springfield
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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