HomeSearch by dateVacation packagesHotelsFlight dealsCar rentalTravel tips & news
Seattle

$144+ Cheap flights from Harrisburg to Seattle (MDT - SEA)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 9/23. Fares are subject to change and may not be available on all flights or dates of travel.
MDT — SEA
Jul 8 — Jul 151
Tue 7/8
Tue 7/15
1 adult, Economy
We work with more than 300 partners to bring you better travel deals

Find cheap flights from Harrisburg to Seattle with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheapflights Tip: The best prices from Harrisburg to Seattle/Tacoma Intl are usually found in February or March, booked 36 days in advance, depart on a Wednesday or Thursday and return on a Wednesday

Cheap flight deals from Harrisburg to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Harrisburg (MDT) to Seattle (SEA). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated July 3, 2025.

Round-trip from

$257
(United Airlines)

One-way from

$144
(Delta)

Popular in

July

Cheapest in

February

Average price

$677
From Harrisburg to Seattle/Tacoma Intl
Search Deals
One-way flight from Harrisburg to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 11% potential increase in price ($62 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($17 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
Search Deals

Find flight deals from Harrisburg to Seattle

Cheapest flights from Harrisburg to Seattle
Explore the most affordable flight options available from Harrisburg to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on July 3, 2025.

This United Airlines deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/255:48 pmMDT - SEA
1 stop7h 32mUnited Airlines
Sat 8/3011:54 pmSEA - MDT
1 stop7h 20mUnited Airlines
Deal found 7/3$257
This American Airlines deal was found by Cheapflights users on 7/1. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 10/231:52 pmMDT - SEA
1 stop10h 02mAmerican Airlines
Mon 10/2712:03 pmSEA - MDT
1 stop7h 02mAmerican Airlines
Deal found 7/1$287
This Mytrip deal was found by Cheapflights users on 7/3. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Mytrip is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 7/317:00 pmMDT - SEA
3 stops24h 25mMultiple Airlines
Thu 8/711:59 pmSEA - MDT
2 stops14h 20mMultiple Airlines
Deal found 7/3$426

Cheapflights Fare Finder

Customize your flight search to find flights from Harrisburg to Seattle 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, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
Use the filters below to find and compare flights from Harrisburg to Seattle that are best for you.

Fly from

Harrisburg

Fly to

Seattle

Route

Depart

Return

Price

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Mon 8/25

5:48 pm-10:20 pm

1 stop7h 32m

Seattle/Tacoma Intl

Sat 8/30

11:54 pm-10:14 am

1 stop7h 20m

$257

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Thu 10/23

1:52 pm-8:54 pm

1 stop10h 02m

Seattle/Tacoma Intl

Mon 10/27

12:03 pm-10:05 pm

1 stop7h 02m

$287

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Thu 7/31

7:00 pm-4:25 pm

3 stops24h 25m

Seattle/Tacoma Intl

Thu 8/7

11:59 pm-5:19 pm

2 stops14h 20m

$426

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 9/23

12:28 pm-5:54 pm

1 stop8h 26m

$144

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Tue 9/23

6:45 am-6:49 pm

3 stops15h 04m

$204

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sun 8/3

7:00 pm-10:50 pm

3 stops30h 50m

$233

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Sat 7/26

11:23 am-11:42 pm

2 stops15h 19m

$245

HarrisburgSeattle

MDT - SEA

MDTSEA

Harrisburg

Wed 7/9

5:30 am-9:56 am

1 stop7h 26m

$349

Flights are sorted by cheapest round-trip flights first.

Deals found on 7/3

Best time to book a flight from Harrisburg to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Harrisburg with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Harrisburg to Seattle

How far ahead should I book a flight from Harrisburg to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Harrisburg to Seattle. Price data was last updated on June 27, 2025.

Booking 36 days in advance of your planned departure date is, on average, the best time to get cheap flights from Harrisburg to Seattle. The general trend is that the closer you book to the departure date, the more expensive your flight will be.

What is the cheapest month to book a flight from Harrisburg to Seattle?

Currently, January is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $238). Flying from Harrisburg to Seattle in July is currently the most expensive (average of $390). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from MDT to SEA?

Find hourly flight availability from Harrisburg to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated July 3, 2025.

It’s typically best to fly out from Harrisburg to Seattle at noon. Doing so could potentially save you 22% on the flight price compared to flying in the morning, which is usually more expensive.

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Seattle. Reviews last updated July 3, 2025.
Get a feel of what it's like to fly with Delta, United Airlines, and American Airlines from Harrisburg to Seattle by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Delta
8.0
Very good
7,970 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
United Airlines
7.4
Good
8,845 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
American Airlines
7.2
Good
10,000 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!
Frontier
5.9
Fair
3,284 reviews
Delta
8.0
Very good
7,970 reviews

Comfort

7.9

Boarding

8.2

Overall

8.0

Entertainment

7.9

Crew

8.5

Food

7.3

Reviews

1 / 20
10.0
Excellent

Kim,May 2025

PIH - SLC

This trip was fine even with delay I had plenty of time to get connection flight!

Related info for your journey

Find useful and relevant information for your journey from Harrisburg to Seattle. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What are the cheapest airlines flying from Harrisburg to Seattle round-trip?

    United Airlines, at $257, was found to be the cheapest airline from Harrisburg to Seattle. An alternate airline flying to your destination would be American Airlines. These flights start at 48% lower than the current average price 3 months from now.

  • What are the cheapest airlines to fly from Harrisburg to Seattle one-way?

    To fly one-way, consider booking your trip with Delta, which is currently one of the cheapest options available, starting at $144. United Airlines flights start at $204 while deals on Frontier start at $245 one-way.

  • Can I find deals for flights from Harrisburg to Seattle that include hotel bookings?

    Yes. In addition to deals on Harrisburg to Seattle flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Harrisburg to Seattle?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Harrisburg to Seattle.

  • Can I find deals for business class flights from Harrisburg to Seattle?

    Yes. Cheapflights offers flight deals from Harrisburg to Seattle by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Harrisburg to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Harrisburg to Seattle (average of $238). Flying from Harrisburg to Seattle in July is currently the most expensive (average of $390). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Harrisburg?

Book flights to Harrisburg if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lacey
Leavenworth
Lynnwood
Renton
Olympia
Shoreline
Puyallup
Cle Elum
Centralia
Kent
Federal Way
Chehalis
Kirkland
Aberdeen
Shelton

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Alternative routes for Harrisburg to Seattle

See prices for flight routes from nearby airports that may be better suited for you.
John F Kennedy Intl to Seattle flights
Newark to Seattle flights
Reagan-National to Seattle flights
Dulles Intl to Seattle flights
LaGuardia to Seattle flights
Philadelphia to Seattle flights
John F Kennedy Intl to Portland flights
Newark to Portland flights
Pittsburgh to Seattle flights
LaGuardia to Portland flights
Dulles Intl to Portland flights
Reagan-National to Portland flights
Philadelphia to Portland flights
Dulles Intl to Spokane flights
Reagan-National to Spokane flights
Allentown to Seattle flights
Philadelphia to Spokane flights
John F Kennedy Intl to Spokane flights
LaGuardia to Spokane flights
Pittsburgh to Portland flights
Newark to Spokane flights
Scranton to Seattle flights
Harrisburg to Portland flights
Newark to Pasco flights
John F Kennedy Intl to Pasco flights
Elmira to Seattle flights
Philadelphia to Pasco flights
LaGuardia to Pasco flights
Scranton to Portland flights
Pittsburgh to Spokane flights
State College to Seattle flights
Dulles Intl to Pasco flights
Allentown to Portland flights
State College to Portland flights
Reagan-National to Pasco flights
Elmira to Portland flights
Harrisburg to Spokane flights
John F Kennedy Intl to Bellingham flights
Dulles Intl to Bellingham flights
Dulles Intl to Pullman flights
Reagan-National to Pullman flights
Reagan-National to Bellingham flights
Newark to Bellingham flights
Reagan-National to Walla Walla flights
John F Kennedy Intl to Walla Walla flights
Dulles Intl to Walla Walla flights
Allentown to Spokane flights
John F Kennedy Intl to Yakima flights
Philadelphia to Pullman flights

Top 4 airlines flying from Harrisburg to Seattle

Discover the top 4 airlines that operate flights from Harrisburg to Seattle. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated July 3, 2025.
AirlineCheapestAverageFlexibilityOn-time
DeltaCheapest$286Average$436FlexibilityNo cancel feeOn-timeN/A
American AirlinesCheapest$307Average$530FlexibilityNo cancel feeOn-time71%
United AirlinesCheapest$307Average$520FlexibilityNo cancel feeOn-time69%
Alaska AirlinesCheapest$352Average$696FlexibilityNo cancel feeOn-time75%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.