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 68% 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 December 2025.

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.

$107 Cheap Flights from Duluth to Seattle in 2025/26

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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.

3:07 pm - 10:45 pm

DLH

SEA

9h 38m1 stop

11:59 pm - 10:44 am

SEA

DLH

8h 45m1 stop

$341United Airlines

Tue, Mar 24 - Sun, Mar 29

11:20 am - 9:14 pm

DLH

SEA

11h 54m2 stops

11:59 pm - 10:44 am

SEA

DLH

8h 45m1 stop

$346United Airlines

Tue, Mar 24 - Sun, Mar 29

4:30 pm - 8:48 pm

DLH

SEA

6h 18m1 stop

6:00 am - 3:50 pm

SEA

DLH

7h 50m1 stop

$448Delta

Mon, Mar 9 - Fri, Mar 13

7:53 am - 9:14 pm

DLH

SEA

15h 21m3 stops

11:59 pm - 10:44 am

SEA

DLH

8h 45m1 stop

$513United Airlines

Tue, Mar 24 - Sun, Mar 29

7:40 am - 6:28 pm

DLH

SEA

12h 48m2 stops

10:58 am - 9:59 pm

SEA

DLH

9h 01m1 stop

$532United Airlines

Sat, Jan 31 - Wed, Feb 4

7:40 am - 6:28 pm

DLH

SEA

12h 48m2 stops

8:20 am - 9:59 pm

SEA

DLH

11h 39m2 stops

$537United Airlines

Sat, Jan 31 - Wed, Feb 4

7:40 am - 9:12 pm

DLH

SEA

15h 32m3 stops

7:00 am - 9:59 pm

SEA

DLH

12h 59m2 stops

$542United Airlines

Sat, Jan 31 - Wed, Feb 4

3:05 pm - 4:01 pm

DLH

SEA

26h 56m1 stop

10:58 am - 9:59 pm

SEA

DLH

9h 01m1 stop

$556United Airlines

Sat, Jan 31 - Wed, Feb 4

12:43 pm - 8:50 pm

DLH

SEA

10h 07m2 stops

6:00 am - 3:50 pm

SEA

DLH

7h 50m1 stop

$737Delta

Mon, Mar 9 - Fri, Mar 13

11:20 am - 9:49 am

DLH

SEA

24h 29m2 stops

11:59 pm - 10:43 am

SEA

DLH

32h 44m2 stops

$873United Airlines

Mon, Mar 9 - Fri, Mar 13

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Mar 24

DLH3:07 pmDuluth Intl

9h 38m

1 stop

SEA10:45 pmSeattle/Tacoma Intl

Mar 29

SEA11:59 pmSeattle/Tacoma Intl

8h 45m

1 stop

DLH10:44 amDuluth Intl

$341

Find similar

United Airlines

Mar 24

DLH11:20 amDuluth Intl

11h 54m

2 stops

SEA9:14 pmSeattle/Tacoma Intl

Mar 29

SEA11:59 pmSeattle/Tacoma Intl

8h 45m

1 stop

DLH10:44 amDuluth Intl

$346

Find similar

United Airlines

Mar 24

DLH7:53 amDuluth Intl

15h 21m

3 stops

SEA9:14 pmSeattle/Tacoma Intl

Mar 29

SEA11:59 pmSeattle/Tacoma Intl

8h 45m

1 stop

DLH10:44 amDuluth Intl

$513

Find similar

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Mar 9

DLH4:30 pmDuluth Intl

6h 18m

1 stop

SEA8:48 pmSeattle/Tacoma Intl

Mar 13

SEA6:00 amSeattle/Tacoma Intl

7h 50m

1 stop

DLH3:50 pmDuluth Intl

$448

Find similar

Delta

Dec 23

DLH11:55 amDuluth Intl

5h 56m

1 stop

SEA3:51 pmSeattle/Tacoma Intl

Dec 30

SEA6:10 amSeattle/Tacoma Intl

7h 20m

1 stop

DLH3:30 pmDuluth Intl

$518

Find similar

Delta

Dec 23

DLH5:00 amDuluth Intl

7h 45m

1 stop

SEA10:45 amSeattle/Tacoma Intl

Dec 30

SEA6:10 amSeattle/Tacoma Intl

7h 20m

1 stop

DLH3:30 pmDuluth Intl

$631

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 3/24

3:07 pm-10:45 pm

1 stop9h 38m

Seattle/Tacoma Intl

Sun 3/29

11:59 pm-10:44 am

1 stop8h 45m

$341

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 3/24

11:20 am-9:14 pm

2 stops11h 54m

Seattle/Tacoma Intl

Sun 3/29

11:59 pm-10:44 am

1 stop8h 45m

$346

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Mon 3/9

4:30 pm-8:48 pm

1 stop6h 18m

Seattle/Tacoma Intl

Fri 3/13

6:00 am-3:50 pm

1 stop7h 50m

$448

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Tue 3/24

7:53 am-9:14 pm

3 stops15h 21m

Seattle/Tacoma Intl

Sun 3/29

11:59 pm-10:44 am

1 stop8h 45m

$513

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 1/31

7:40 am-6:28 pm

2 stops12h 48m

Seattle/Tacoma Intl

Wed 2/4

10:58 am-9:59 pm

1 stop9h 01m

$532

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 1/31

7:40 am-6:28 pm

2 stops12h 48m

Seattle/Tacoma Intl

Wed 2/4

8:20 am-9:59 pm

2 stops11h 39m

$537

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 1/31

7:40 am-9:12 pm

3 stops15h 32m

Seattle/Tacoma Intl

Wed 2/4

7:00 am-9:59 pm

2 stops12h 59m

$542

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Sat 1/31

3:05 pm-4:01 pm

1 stop26h 56m

Seattle/Tacoma Intl

Wed 2/4

10:58 am-9:59 pm

1 stop9h 01m

$556

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Mon 3/9

12:43 pm-8:50 pm

2 stops10h 07m

Seattle/Tacoma Intl

Fri 3/13

6:00 am-3:50 pm

1 stop7h 50m

$737

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Mon 3/9

11:20 am-9:49 am

2 stops24h 29m

Seattle/Tacoma Intl

Fri 3/13

11:59 pm-10:43 am

2 stops32h 44m

$873

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 16 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 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.

What is the cheapest day to depart on your flight to Seattle?

On average, the least expensive day to fly to Seattle from Duluth is on a Tuesday. momondo users have found tickets for Tuesday departures for as low as $369. However, this price may fluctuate depending on the airline, the season, and holidays. On the other hand, Saturday is the most expensive day to depart from Duluth because it is more convenient for both business and leisure travelers. As a result, prices tend to be around $571.

What is the cheapest time of day to depart on your flight to Seattle?

Flying to Seattle from Duluth in the afternoon is the least expensive time of day to depart. momondo users have found prices as low as $495 when looking at flights departing in the afternoon. Flights to Seattle are more costly at noon, with an average ticket price of $505. Departure times at noon fall within the peak daily travel times, which is why tickets can be more expensive.

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	6h 18m
Direct flights	None

The fastest flight from Duluth to Seattle takes 6h 18m

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 6h 18m, 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 December 2025.
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 68% of the total bookings. Other popular airlines include United Airlines with 17% and Sun Country Air with 15%.

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 6.9 333 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 9,094 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 8,010 reviews	Search Delta flights

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Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Redmond

Tukwila

Cle Elum

Federal Way

Lakewood

Fife

Centralia

Westport

Kirkland

Shoreline

Why use momondo?

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

momondo collates all your flight options in one place and lets you filter them to find the perfect flight from Duluth to Seattle. momondo saves you time and could save you money on your trip.

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.

I’m not ready to book a flight from Duluth to Seattle right now. Can momondo alert me if prices change?

Of course. momondo tracks the price of Duluth to Seattle flights. All you need is a valid email address and we will do the rest; it is that quick and easy.