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$278+ Cheap flights from Duluth to Seattle (DLH - SEA)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 4/30. Fares are subject to change and may not be available on all flights or dates of travel.
DLH — SEA
Feb 20 — Feb 271
Fri 2/20
Fri 2/27
1 adult, Economy
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Cheap flight deals from Duluth to Seattle

Cheapest flights from Duluth to Seattle
Explore the most affordable flight options available from Duluth to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on January 21, 2026.

This United Airlines deal was found by Cheapflights users on 1/20. 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.
Thu 4/3011:14 am
DLH
-
SEA
1 stop9h 46m
United Airlines
Mon 5/411:48 pm
SEA
-
DLH
1 stop8h 41m
United Airlines
Deal found 1/20$278
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 4/2112:46 pm
DLH
-
SEA
1 stop9h 56m
Delta
Sun 4/2611:59 pm
SEA
-
DLH
1 stop20h 47m
Delta
Deal found 1/20$355
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:10 am
DLH
-
SEA
1 stop5h 40m
Delta
Sun 9/66:05 am
SEA
-
DLH
1 stop7h 14m
Delta
Deal found 1/20$362
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Thu 4/237:45 am
DLH
-
SEA
2 stops15h 08m
United Airlines
Tue 4/2811:59 pm
SEA
-
DLH
1 stop8h 30m
United Airlines
Deal found 1/20$364
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:10 am
DLH
-
SEA
1 stop5h 40m
Delta
Sat 9/59:30 am
SEA
-
DLH
2 stops12h 08m
Delta
Deal found 1/20$370
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 2/175:00 am
DLH
-
SEA
1 stop7h 55m
Delta
Tue 2/246:10 am
SEA
-
DLH
1 stop7h 21m
Delta
Deal found 1/20$376
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Tue 2/1711:20 am
DLH
-
SEA
1 stop9h 43m
United Airlines
Tue 2/245:20 pm
SEA
-
DLH
2 stops15h 23m
United Airlines
Deal found 1/20$386
This United Airlines deal was found by Cheapflights users on 1/20. 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.
Fri 4/2411:19 am
DLH
-
SEA
1 stop9h 41m
United Airlines
Tue 4/287:37 pm
SEA
-
DLH
2 stops12h 52m
United Airlines
Deal found 1/20$398
This Delta deal was found by Cheapflights users on 1/20. 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 Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 8/305:10 am
DLH
-
SEA
1 stop5h 40m
Delta
Fri 9/46:50 pm
SEA
-
DLH
1 stop26h 48m
Delta
Deal found 1/20$401

Find flight deals from Duluth to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Duluth (DLH) 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 January 21, 2026.

Most accurate provider

FlightHub
3 stars

Most trusted provider

Expedia
3 stars

Round-trip from

$278
(United Airlines)

Popular in

August

Cheapest in

September

Average price

$290
Provider with most accurate pricing for Duluth Intl-Seattle/Tacoma Intl flight deals.
Search Deals
Provider most trusted by Cheapflights users for Duluth Intl-Seattle/Tacoma Intl flights.
Search Deals
From Duluth Intl to Seattle/Tacoma Intl
Search Deals
Highest demand for flights based on searches. 0% potential increase in price ($1 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 3% potential price decrease ($13 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in January 2026
Search Deals

Cheapflights Fare Finder

 
Customize your flight search to find flights from Duluth 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 January 21, 2026.
Use the filters below to find and compare flights from Duluth to Seattle that are best for you.

Fly from

Duluth

Fly to

Seattle

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/30

11:14 am-7:00 pm

1 stop9h 46m

Seattle/Tacoma Intl

Mon 5/4

11:48 pm-10:29 am

1 stop8h 41m

$278

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

12:46 pm-11:53 pm

1 stop13h 07m

Seattle/Tacoma Intl

Mon 4/27

6:00 am-10:46 pm

1 stop14h 46m

$355

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 4/21

12:46 pm-8:42 pm

1 stop9h 56m

Seattle/Tacoma Intl

Sun 4/26

11:59 pm-10:46 pm

1 stop20h 47m

$355

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

12:46 pm-11:53 pm

1 stop13h 07m

Seattle/Tacoma Intl

Tue 4/28

6:00 am-8:01 pm

1 stop12h 01m

$355

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 4/21

12:46 pm-8:42 pm

1 stop9h 56m

Seattle/Tacoma Intl

Mon 4/27

11:59 pm-8:01 pm

1 stop18h 02m

$355

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 4/23

7:45 am-8:53 pm

2 stops15h 08m

Seattle/Tacoma Intl

Tue 4/28

11:59 pm-10:29 am

1 stop8h 30m

$364

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 2/17

5:00 am-10:55 am

1 stop7h 55m

Seattle/Tacoma Intl

Tue 2/24

6:10 am-3:31 pm

1 stop7h 21m

$376

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 2/17

11:20 am-7:03 pm

1 stop9h 43m

Seattle/Tacoma Intl

Tue 2/24

5:20 pm-10:43 am

2 stops15h 23m

$386

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 2/3

4:24 pm-8:46 pm

1 stop6h 22m

Seattle/Tacoma Intl

Sat 2/7

6:05 am-3:44 pm

1 stop7h 39m

$411

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 1/27

7:40 am-4:01 pm

1 stop10h 21m

$378

Flights are sorted by cheapest round-trip flights first.

Deals found on 1/19

Compare providers for flights from Duluth to Seattle

Provider information is updated monthly. Please note that these providers often have deals for this flight, but the availability may vary on a day-by-day basis on Cheapflights.
Use the table below to compare price accuracy, trust ratings, and cancellation policies for each provider offering flight deals from Duluth to Seattle in January.
ProviderPrice AccuracyTrust Score*
ExpediaPrice Accuracy2 starsTrust Score*3 stars
FlightHubPrice Accuracy3 starsTrust Score*1 star

*The Trust Score is based on feedback from users after their booking experience. It measures overall satisfaction, helping us identify issues like hidden fees, problems during the ticketing process, and the quality of customer service. This score is our best indicator of the provider's quality and reliability.

  • Most accurate provider: When it comes to deals on Duluth-Seattle flights, users find the pricing of FlightHub to be most consistent on Cheapflights vs. FlightHub Users can find the same prices on Duluth-Seattle flight deals on Cheapflights vs. FlightHub >95% of the time. Price accuracy is based on data collected from Duluth-Seattle flight searches over the past month and is updated monthly.
  • Most trusted provider: When it comes to deals on Duluth-Seattle flights, Cheapflights users trust Expedia the most. Expedia has received a user feedback score of 3 out of 3 stars (3 being the best), meaning they have been trusted the most by Cheapflights users looking for Duluth-Seattle flight deals. Provider user feedback score is based on Cheapflights searches over the past month and is updated monthly.

Best time to book a flight from Duluth to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Duluth 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 Duluth to Seattle

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

Currently, May is the cheapest month in which you can book a flight from Duluth to Seattle (average of $118). Flying from Duluth to Seattle in February is currently the most expensive (average of $500). 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.

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 January 21, 2026.
Read reviews from past customers who have flown Delta, United Airlines, and Sun Country Air from Duluth to Seattle. Users can see the overall rating for each airline as well as how each is rated in terms of entertainment options, comfort, food, crew/service, and boarding process.
Delta
7.9
Good
8,088 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rona,Feb 2024

MSP - DEN

It was a good experience other than a short delay.
Delta
7.9
Good
8,088 reviews
Delta
7.9
Good
8,088 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rona,Feb 2024

MSP - DEN

It was a good experience other than a short delay.
United Airlines
7.4
Good
9,191 reviews
Delta
7.9
Good
8,088 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rona,Feb 2024

MSP - DEN

It was a good experience other than a short delay.
Sun Country Air
6.9
Okay
343 reviews
Delta
7.9
Good
8,088 reviews

Crew

8.5

Comfort

7.9

Boarding

8.1

Overall

7.9

Entertainment

7.8

Food

7.2

Reviews

1 / 20
8.0
Excellent

Rona,Feb 2024

MSP - DEN

It was a good experience other than a short delay.

Related info for your journey

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

  • How long is the flight from Duluth to Seattle?

    A quick flight from Duluth to Seattle can take about 9h 46m. United Airlines provides one of the quickest options available for as low as $278. There are 1406 mi between Duluth and Seattle. When browsing for deals, the options you’ll see will be for both nonstop flights and flights with stops.

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

    Currently priced at $93, Sun Country Air will fly you from Duluth to Seattle and back. In addition to Sun Country Air, many other airlines offer competitively priced options for your trip. Search Cheapflights for deals from Delta and United Airlines - these airlines can fly you to your destination from $258 and $258, respectively. Sun Country Air is 77% cheaper than the average price of flights available within the next 90 days to this destination.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Duluth 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 Duluth to Seattle?

    Currently, May is the cheapest month in which you can book a flight from Duluth to Seattle (average of $118). Flying from Duluth to Seattle in February is currently the most expensive (average of $500). 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 Seattle?

Book flights to Seattle if you plan to visit one of these locations
Tacoma
SeaTac
Lakewood
Ocean Shores
Olympia
Lynnwood
Lacey
Edmonds
Renton
Puyallup
Kirkland
Kent
Tukwila
Fife
Aberdeen
Shoreline
Marysville
Centralia
Federal Way
Chehalis

Browse thousands of different options on Cheapflights for your next trip

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Top 3 airlines flying from Duluth to Seattle

Discover the top 3 airlines that operate flights from Duluth 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 January 21, 2026.
AirlineCheapestAverageFlexibilityOn-time
Sun Country AirCheapest$93Average$168FlexibilityNo cancel feeOn-time83%
United AirlinesCheapest$258Average$411FlexibilityNo cancel feeOn-time69%
DeltaCheapest$258Average$453FlexibilityNo cancel feeOn-timeN/A

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