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Cheap flights from Helena to Washington, D.C. from $402

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 4/30. 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
5:40 am - 6:35 pm
HLN
-
DCA
10h 55m
2 stops
Delta Logo
10:10 am - 10:30 pm
DCA
-
HLN
14h 20m
2 stops
$614Delta
Tue, Apr 21 - Thu, Apr 23
Delta Logo
5:40 am - 6:59 pm
HLN
-
DCA
11h 19m
2 stops
Delta Logo
10:10 am - 10:30 pm
DCA
-
HLN
14h 20m
2 stops
$620Delta
Tue, Apr 21 - Thu, Apr 23
Delta Logo
5:40 am - 6:35 pm
HLN
-
DCA
10h 55m
2 stops
Delta Logo
11:00 am - 10:30 pm
DCA
-
HLN
13h 30m
2 stops
$654Delta
Tue, Apr 21 - Fri, Apr 24
Delta Logo
5:40 am - 6:59 pm
HLN
-
DCA
11h 19m
2 stops
Delta Logo
5:10 pm - 10:30 pm
DCA
-
HLN
7h 20m
1 stop
$665Delta
Tue, Apr 21 - Fri, Apr 24
Alaska Airlines Logo
6:22 pm - 5:59 pm
HLN
-
DCA
21h 37m
2 stops
Alaska Airlines Logo
8:00 am - 5:45 pm
DCA
-
HLN
11h 45m
1 stop
$732Alaska Airlines
Tue, Apr 21 - Thu, Apr 23
Delta Logo
5:40 am - 6:35 pm
HLN
-
DCA
10h 55m
2 stops
Delta Logo
5:10 pm - 10:30 pm
DCA
-
HLN
7h 20m
1 stop
$762Delta
Tue, Apr 21 - Fri, Apr 24
United Airlines Logo
2:25 pm - 8:56 am
HLN
-
DCA
16h 31m
2 stops
United Airlines Logo
8:20 am - 9:33 pm
DCA
-
HLN
15h 13m
2 stops
$763United Airlines
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
2:25 pm - 8:56 am
HLN
-
DCA
16h 31m
2 stops
United Airlines Logo
8:20 am - 9:33 pm
DCA
-
HLN
15h 13m
2 stops
$777United Airlines
Sat, Apr 18 - Wed, Apr 22
United Airlines Logo
2:25 pm - 9:59 am
HLN
-
DCA
17h 34m
2 stops
United Airlines Logo
6:30 am - 9:33 pm
DCA
-
HLN
17h 03m
2 stops
$782United Airlines
Sat, Apr 18 - Wed, Apr 22
Alaska Airlines Logo
6:22 pm - 9:59 pm
HLN
-
DCA
25h 37m
1 stop
Alaska Airlines Logo
8:00 am - 5:45 pm
DCA
-
HLN
11h 45m
1 stop
$792Alaska Airlines
Tue, Apr 21 - Thu, Apr 23

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

Our best Delta deals on Helena to Washington, D.C. Reagan-National Airport flight tickets
Delta
Apr 21
HLN5:40 amHelena
10h 55m
2 stops
DCA6:35 pmWashington, D.C. Reagan-National
Apr 23
DCA10:10 amWashington, D.C. Reagan-National
14h 20m
2 stops
HLN10:30 pmHelena
$614
Delta
Apr 21
HLN5:40 amHelena
11h 19m
2 stops
DCA6:59 pmWashington, D.C. Reagan-National
Apr 23
DCA10:10 amWashington, D.C. Reagan-National
14h 20m
2 stops
HLN10:30 pmHelena
$620
Delta
Apr 21
HLN5:40 amHelena
10h 55m
2 stops
DCA6:35 pmWashington, D.C. Reagan-National
Apr 24
DCA11:00 amWashington, D.C. Reagan-National
13h 30m
2 stops
HLN10:30 pmHelena
$654

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
May 2
HLN6:22 pmHelena
25h 37m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
May 6
DCA8:00 amWashington, D.C. Reagan-National
11h 45m
1 stop
HLN5:45 pmHelena
$663
Alaska Airlines
Apr 21
HLN6:22 pmHelena
21h 37m
2 stops
DCA5:59 pmWashington, D.C. Reagan-National
Apr 23
DCA8:00 amWashington, D.C. Reagan-National
11h 45m
1 stop
HLN5:45 pmHelena
$732
Alaska Airlines
Apr 21
HLN6:22 pmHelena
25h 37m
1 stop
DCA9:59 pmWashington, D.C. Reagan-National
Apr 23
DCA8:00 amWashington, D.C. Reagan-National
11h 45m
1 stop
HLN5:45 pmHelena
$792

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 March 23, 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

Tue 4/21

5:40 am-6:35 pm

2 stops10h 55m

Washington, D.C. Reagan-National

Thu 4/23

10:10 am-10:30 pm

2 stops14h 20m

$614

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

5:40 am-6:59 pm

2 stops11h 19m

Washington, D.C. Reagan-National

Thu 4/23

10:10 am-10:30 pm

2 stops14h 20m

$620

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

5:40 am-6:35 pm

2 stops10h 55m

Washington, D.C. Reagan-National

Fri 4/24

11:00 am-10:30 pm

2 stops13h 30m

$654

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

5:40 am-6:59 pm

2 stops11h 19m

Washington, D.C. Reagan-National

Fri 4/24

5:10 pm-10:30 pm

1 stop7h 20m

$665

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

6:22 pm-5:59 pm

2 stops21h 37m

Washington, D.C. Reagan-National

Thu 4/23

8:00 am-5:45 pm

1 stop11h 45m

$732
Quickest round-trip

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

5:40 am-6:35 pm

2 stops10h 55m

Washington, D.C. Reagan-National

Fri 4/24

5:10 pm-10:30 pm

1 stop7h 20m

$762

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 4/18

2:25 pm-8:56 am

2 stops16h 31m

Washington, D.C. Reagan-National

Wed 4/22

8:20 am-9:33 pm

2 stops15h 13m

$763

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 4/18

2:25 pm-8:56 am

2 stops16h 31m

Washington, D.C. Reagan-National

Wed 4/22

8:20 am-9:33 pm

2 stops15h 13m

$777

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Sat 4/18

2:25 pm-9:59 am

2 stops17h 34m

Washington, D.C. Reagan-National

Wed 4/22

6:30 am-9:33 pm

2 stops17h 03m

$782

HelenaWashington, D.C.

HLN - DCA

HLNDCA

Helena

Tue 4/21

6:22 pm-9:59 pm

1 stop25h 37m

Washington, D.C. Reagan-National

Thu 4/23

8:00 am-5:45 pm

1 stop11h 45m

$792

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 15 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?

Alaska Airlines 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?

United Airlines, Delta 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. United Airlines is the first choice among our users, with 43% 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

  • 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
9,460 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
Silver Spring
Fredericksburg
Rockville
Tysons
Manassas
Linthicum Heights
Springfield
Bethesda
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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