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

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

What airlines fly to Seattle?

Delta, Sun Country Air and United Airlines 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 71% 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 September 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

3:07 pm - 10:30 pmDLH-SEA

9h 23m1 stop

11:40 pm - 10:45 amSEA-DLH

9h 05m1 stop

$338United Airlines

Find Deal

Fri, Oct 17 - Mon, Oct 20

11:20 am - 6:49 pmDLH-SEA

9h 29m1 stop

5:26 pm - 10:45 amSEA-DLH

15h 19m2 stops

$344United Airlines

Find Deal

Fri, Oct 17 - Mon, Oct 20

12:00 pm - 4:19 pmDLH-SEA

6h 19m1 stop

3:45 pm - 11:52 pmSEA-DLH

6h 07m1 stop

$367Delta

Find Deal

Fri, Feb 27 - Tue, Mar 3

11:20 am - 9:53 pmDLH-SEA

12h 33m2 stops

5:26 pm - 10:45 amSEA-DLH

15h 19m2 stops

$383United Airlines

Find Deal

Fri, Oct 17 - Mon, Oct 20

4:20 pm - 7:48 pmDLH-SEA

29h 28m2 stops

3:45 pm - 11:52 pmSEA-DLH

6h 07m1 stop

$397Delta

Find Deal

Fri, Feb 27 - Tue, Mar 3

3:07 pm - 11:15 pmDLH-SEA

34h 08m2 stops

5:26 pm - 10:45 amSEA-DLH

15h 19m2 stops

$407United Airlines

Find Deal

Fri, Oct 17 - Mon, Oct 20

8:00 am - 3:45 pmDLH-SEA

9h 45m1 stop

5:31 pm - 10:45 amSEA-DLH

15h 14m2 stops

$463United Airlines

Find Deal

Fri, Oct 10 - Wed, Oct 15

9:45 am - 11:15 pmDLH-SEA

15h 30m2 stops

11:59 pm - 10:37 amSEA-DLH

8h 38m1 stop

$471United Airlines

Find Deal

Thu, Oct 23 - Thu, Oct 30

12:00 pm - 6:36 amDLH-SEA

20h 36m2 stops

7:45 pm - 11:07 amSEA-DLH

13h 22m2 stops

$481Delta

Find Deal

Fri, Feb 27 - Tue, Mar 3

8:00 am - 6:49 pmDLH-SEA

12h 49m1 stop

11:40 pm - 10:45 amSEA-DLH

9h 05m1 stop

$491United Airlines

Find Deal

Fri, Oct 10 - Wed, Oct 15

United Airlines flights from Duluth to Seattle

Our best United Airlines deals on Duluth to Seattle flight tickets

United Airlines

Oct 17

DLH3:07 pmDuluth Intl

9h 23m

1 stop

SEA10:30 pmSeattle/Tacoma Intl

Oct 20

SEA11:40 pmSeattle/Tacoma Intl

9h 05m

1 stop

DLH10:45 amDuluth Intl

$338

Find similar

United Airlines

Oct 17

DLH11:20 amDuluth Intl

9h 29m

1 stop

SEA6:49 pmSeattle/Tacoma Intl

Oct 20

SEA5:26 pmSeattle/Tacoma Intl

15h 19m

2 stops

DLH10:45 amDuluth Intl

$344

Find similar

United Airlines

Oct 17

DLH11:20 amDuluth Intl

12h 33m

2 stops

SEA9:53 pmSeattle/Tacoma Intl

Oct 20

SEA5:26 pmSeattle/Tacoma Intl

15h 19m

2 stops

DLH10:45 amDuluth Intl

$383

Find similar

Delta flights from Duluth to Seattle

Our best Delta deals on Duluth to Seattle flight tickets

Delta

Feb 27

DLH12:00 pmDuluth Intl

6h 19m

1 stop

SEA4:19 pmSeattle/Tacoma Intl

Mar 3

SEA3:45 pmSeattle/Tacoma Intl

6h 07m

1 stop

DLH11:52 pmDuluth Intl

$367

Find similar

Delta

Feb 27

DLH4:20 pmDuluth Intl

29h 28m

2 stops

SEA7:48 pmSeattle/Tacoma Intl

Mar 3

SEA3:45 pmSeattle/Tacoma Intl

6h 07m

1 stop

DLH11:52 pmDuluth Intl

$397

Find similar

Delta

Feb 27

DLH12:00 pmDuluth Intl

20h 36m

2 stops

SEA6:36 amSeattle/Tacoma Intl

Mar 3

SEA7:45 pmSeattle/Tacoma Intl

13h 22m

2 stops

DLH11:07 amDuluth Intl

$481

Find similar

Fly from

Fly to

Route

Depart

Return

Price

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/17

3:07 pm-10:30 pm

1 stop9h 23m

Seattle/Tacoma Intl

Mon 10/20

11:40 pm-10:45 am

1 stop9h 05m

$338

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/17

11:20 am-6:49 pm

1 stop9h 29m

Seattle/Tacoma Intl

Mon 10/20

5:26 pm-10:45 am

2 stops15h 19m

$344

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 2/27

12:00 pm-4:19 pm

1 stop6h 19m

Seattle/Tacoma Intl

Tue 3/3

3:45 pm-11:52 pm

1 stop6h 07m

$367

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/17

11:20 am-9:53 pm

2 stops12h 33m

Seattle/Tacoma Intl

Mon 10/20

5:26 pm-10:45 am

2 stops15h 19m

$383

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 2/27

4:20 pm-7:48 pm

2 stops29h 28m

Seattle/Tacoma Intl

Tue 3/3

3:45 pm-11:52 pm

1 stop6h 07m

$397

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/17

3:07 pm-11:15 pm

2 stops34h 08m

Seattle/Tacoma Intl

Mon 10/20

5:26 pm-10:45 am

2 stops15h 19m

$407

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/10

8:00 am-3:45 pm

1 stop9h 45m

Seattle/Tacoma Intl

Wed 10/15

5:31 pm-10:45 am

2 stops15h 14m

$463

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Thu 10/23

9:45 am-11:15 pm

2 stops15h 30m

Seattle/Tacoma Intl

Thu 10/30

11:59 pm-10:37 am

1 stop8h 38m

$471

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 2/27

12:00 pm-6:36 am

2 stops20h 36m

Seattle/Tacoma Intl

Tue 3/3

7:45 pm-11:07 am

2 stops13h 22m

$481

DuluthSeattle

DLH - SEA

DLHSEA

Duluth Intl

Fri 10/10

8:00 am-6:49 pm

1 stop12h 49m

Seattle/Tacoma Intl

Wed 10/15

11:40 pm-10:45 am

1 stop9h 05m

$491

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 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 October to fly from Duluth, when ticket prices are also cheap, with an average price of $303.

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

Direct flights	None

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 19m, 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 September 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 71% of the total bookings. Other popular airlines include Sun Country Air with 15% and United Airlines 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 6.9 330 reviews	Search Sun Country Air flights
United Airlines	PriceFrom $258	Free Cancellation	Rating 7.4 8,929 reviews	Search United Airlines flights
Delta	PriceFrom $258	Free Cancellation	Rating 7.9 7,954 reviews	Search Delta flights

Leavenworth

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SeaTac

Ocean Shores

Renton

Olympia

Lynnwood

Kent

Marysville

Puyallup

Federal Way

Kirkland

Tukwila

Shoreline

Lakewood

Centralia

Fife

Cle Elum

Redmond

Westport

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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.

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.