What is the cheapest airline that flies from Duluth Intl to Seattle/Tacoma Intl?

Delta and United Airlines are the most popular carriers operating from Duluth Intl to Seattle/Tacoma Intl

What airlines fly to Seattle?

Delta, United Airlines and Sun Country Air are the top three most popular airlines that fly to Seattle from Duluth according to our data. Delta is the first choice among our users, with 65% of people opting to fly with this airline when traveling to Seattle. Keep in mind that there are 3 different airlines that fly to Seattle on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

Prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport refresh daily.

How many operators does momondo search for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

The number of operators available for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport is 3 as of January 2026.

How old do you have to be to fly from Duluth Intl Airport to Seattle/Tacoma Intl Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Duluth Intl Airport to Seattle/Tacoma Intl Airport.

What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?

The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.

$144 Cheap Flights from Duluth to Seattle in 2026

Q: What is the typical price of a round-trip flight between Duluth and Seattle?

Prices are currently high for flights on this route. Typical prices usually range from $274 to $307. The lowest price recently found on this route was $364.

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Find the cheapest flights from Duluth to Seattle

Round-trip

One-way

Cheap round-trip flights

Enter your travel dates to find the best prices.

11:26 am - 12:33 am

DLH

SEA

15h 07m2 stops

11:00 am - 9:57 pm

SEA

DLH

8h 57m1 stop

$364United Airlines

Sat, Jun 13 - Sun, Jun 21

4:24 pm - 8:46 pm

DLH

SEA

6h 22m1 stop

3:35 pm - 11:52 pm

SEA

DLH

6h 17m1 stop

$371Delta

Tue, Jan 20 - Tue, Jan 27

3:05 pm - 12:59 am

DLH

SEA

11h 54m2 stops

10:58 am - 9:59 pm

SEA

DLH

9h 01m1 stop

$386United Airlines

Wed, Jan 21 - Sun, Jan 25

3:05 pm - 12:59 am

DLH

SEA

11h 54m2 stops

8:10 am - 9:59 pm

SEA

DLH

11h 49m2 stops

$397United Airlines

Wed, Jan 21 - Sun, Jan 25

3:14 pm - 10:29 pm

DLH

SEA

9h 15m1 stop

11:00 am - 9:57 pm

SEA

DLH

8h 57m1 stop

$417United Airlines

Sat, Jun 13 - Sun, Jun 21

11:26 am - 12:33 am

DLH

SEA

15h 07m2 stops

11:20 pm - 2:33 pm

SEA

DLH

13h 13m2 stops

$428United Airlines

Sat, Jun 13 - Sun, Jun 21

7:40 am - 4:01 pm

DLH

SEA

10h 21m1 stop

10:58 am - 9:59 pm

SEA

DLH

9h 01m1 stop

$441United Airlines

Wed, Jan 21 - Sun, Jan 25

7:40 am - 4:01 pm

DLH

SEA

10h 21m1 stop

11:45 pm - 2:30 pm

SEA

DLH

12h 45m2 stops

$483United Airlines

Fri, Jan 23 - Tue, Jan 27

7:40 am - 6:27 pm

DLH

SEA

12h 47m2 stops

11:45 pm - 2:30 pm

SEA

DLH

12h 45m2 stops

$488United Airlines

Fri, Jan 23 - Tue, Jan 27

7:40 am - 9:12 pm

DLH

SEA

15h 32m3 stops

11:45 pm - 2:30 pm

SEA

DLH

12h 45m2 stops

$493United Airlines

Fri, Jan 23 - Tue, Jan 27

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Jan 21

DLH3:05 pmDuluth Intl

11h 54m

2 stops

SEA12:59 amSeattle/Tacoma Intl

Jan 25

SEA10:58 amSeattle/Tacoma Intl

9h 01m

1 stop

DLH9:59 pmDuluth Intl

$386

United Airlines

Jan 15

DLH3:05 pmDuluth Intl

9h 38m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

Jan 21

SEA10:58 amSeattle/Tacoma Intl

9h 01m

1 stop

DLH9:59 pmDuluth Intl

$387

United Airlines

Jan 15

DLH3:05 pmDuluth Intl

9h 38m

1 stop

SEA10:43 pmSeattle/Tacoma Intl

Jan 21

SEA8:40 amSeattle/Tacoma Intl

11h 19m

2 stops

DLH9:59 pmDuluth Intl

$395

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Jan 20

DLH4:24 pmDuluth Intl

6h 22m

1 stop

SEA8:46 pmSeattle/Tacoma Intl

Jan 27

SEA3:35 pmSeattle/Tacoma Intl

6h 17m

1 stop

DLH11:52 pmDuluth Intl

$371

Delta

Jan 20

DLH4:24 pmDuluth Intl

6h 22m

1 stop

SEA8:46 pmSeattle/Tacoma Intl

Jan 27

SEA11:17 amSeattle/Tacoma Intl

10h 35m

2 stops

DLH11:52 pmDuluth Intl

$641

Delta

Jan 20

DLH4:24 pmDuluth Intl

6h 22m

1 stop

SEA8:46 pmSeattle/Tacoma Intl

Jan 27

SEA3:35 pmSeattle/Tacoma Intl

6h 17m

1 stop

DLH11:52 pmDuluth Intl

$911

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 6/13

11:26 am-12:33 am

2 stops15h 07m

Seattle/Tacoma Intl

Sun 6/21

11:00 am-9:57 pm

1 stop8h 57m

$364

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 1/20

4:24 pm-8:46 pm

1 stop6h 22m

Seattle/Tacoma Intl

Tue 1/27

3:35 pm-11:52 pm

1 stop6h 17m

$371

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 1/21

3:05 pm-12:59 am

2 stops11h 54m

Seattle/Tacoma Intl

Sun 1/25

10:58 am-9:59 pm

1 stop9h 01m

$386

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 1/21

3:05 pm-12:59 am

2 stops11h 54m

Seattle/Tacoma Intl

Sun 1/25

8:10 am-9:59 pm

2 stops11h 49m

$397

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 6/13

3:14 pm-10:29 pm

1 stop9h 15m

Seattle/Tacoma Intl

Sun 6/21

11:00 am-9:57 pm

1 stop8h 57m

$417

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 6/13

11:26 am-12:33 am

2 stops15h 07m

Seattle/Tacoma Intl

Sun 6/21

11:20 pm-2:33 pm

2 stops13h 13m

$428

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Wed 1/21

7:40 am-4:01 pm

1 stop10h 21m

Seattle/Tacoma Intl

Sun 1/25

10:58 am-9:59 pm

1 stop9h 01m

$441

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 1/23

7:40 am-4:01 pm

1 stop10h 21m

Seattle/Tacoma Intl

Tue 1/27

11:45 pm-2:30 pm

2 stops12h 45m

$483

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 1/23

7:40 am-6:27 pm

2 stops12h 47m

Seattle/Tacoma Intl

Tue 1/27

11:45 pm-2:30 pm

2 stops12h 45m

$488

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 1/23

7:40 am-9:12 pm

3 stops15h 32m

Seattle/Tacoma Intl

Tue 1/27

11:45 pm-2:30 pm

2 stops12h 45m

$493

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Duluth to Seattle

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

Prices

Airlines

What is the typical price of a round-trip flight between Duluth and Seattle?

What is the cheapest month to fly to Seattle?

In general, September is the cheapest month to fly from Duluth to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $258. If you don’t want to visit Seattle in September, then you should wait until December to fly from Duluth, when ticket prices are also cheap, with an average price of $273.

When to book flights from Duluth to Seattle

Are you open to changing your travel dates? Check out the ideal times to fly from Duluth to Seattle according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Duluth to Seattle (DLH to SEA) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Duluth to Seattle

Fastest flight time	9h 38m
Direct flights	None

The fastest flight from Duluth to Seattle takes 9h 38m

There are no direct flights from Duluth to Seattle. There are no popular flight routes from Duluth to Seattle.

Search flight deals

How far is Duluth Intl to Seattle/Tacoma Intl by plane?
The distance between Duluth Intl and Seattle/Tacoma Intl is about 1410.5 mi. Flights usually cover this in 9h 38m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport refresh daily.
How many operators does momondo search for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
The number of operators available for flights from Duluth Intl Airport to Seattle/Tacoma Intl Airport is 3 as of January 2026.
How old do you have to be to fly from Duluth Intl Airport to Seattle/Tacoma Intl Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Duluth Intl Airport to Seattle/Tacoma Intl Airport.
What documentation or ID do you need to fly to Seattle/Tacoma Intl Airport?
The travel and health documents you'll need for your trip to Seattle/Tacoma Intl Airport may differ based on your itinerary and personal situation. Typically, you should have several documents on hand, such as a national ID card or driver's license and a passport that is valid for six months after your intended arrival at Seattle/Tacoma Intl Airport. It is always advisable to seek advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Duluth to Seattle?
Based on momondo bookings for flights between Duluth and Seattle, the leading airline is Delta, making up 65% of the total bookings. Other popular airlines include United Airlines with 18% and Sun Country Air with 17%.

Best airlines flying from Duluth to Seattle

Compare and see reviews for airlines that fly from Duluth to Seattle with momondo

Airline	Rating	Free Cancellation	Price
Sun Country Air	PriceFrom $93	Free Cancellation	Rating 6.8 340 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,142 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 8,032 reviews	Search Delta flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Tukwila

Federal Way

Cle Elum

Lakewood

Fife

Westport

Kirkland

Centralia

Shoreline

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Why should I use momondo to find a flight deal from Duluth to Seattle?

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Can I find flights from Duluth to Seattle with flexible booking policies on momondo?

Yes. momondo allows you to filter the results for Duluth to Seattle flights to just show those with flexible booking policies.

How can momondo help me find flights from Duluth to Seattle?

Once you have performed a search for Duluth to Seattle flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

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