What is the cheapest airline that flies from Casper Natrona County to Seattle/Tacoma Intl?

United Airlines is the most popular carrier operating from Casper Natrona County to Seattle/Tacoma Intl

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

Prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport were last updated today.

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

As of August 2026, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport.

How old do you have to be to fly from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?

The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County 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.

$268 Cheap Flights from Casper to Seattle in 2026

Discover deals from 900+ travel sites with momondo.

Find the cheapest flights from Casper to Seattle

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

4:15 pm - 9:31 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

6h 16m1 stop Denver Intl

5:00 am - 10:49 amSEA Seattle/Tacoma Intl-CPR Casper Natrona County

4h 49m1 stop Denver Intl

$308United Airlines

Sat, Sep 19 - Sun, Sep 20

11:24 am - 8:43 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

10h 19m2 stops Denver Intl San Francisco

5:00 am - 10:49 amSEA Seattle/Tacoma Intl-CPR Casper Natrona County

4h 49m1 stop Denver Intl

$314United Airlines

Sat, Sep 19 - Sun, Sep 20

7:05 am - 11:44 amCPR Casper Natrona County-SEA Seattle/Tacoma Intl

5h 39m1 stop Denver Intl

8:40 am - 5:18 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

7h 38m1 stop Denver Intl

$323United Airlines

Wed, Aug 26 - Wed, Sep 2

7:05 am - 2:24 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

8h 19m2 stops Denver Intl San Francisco

3:54 pm - 9:59 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

5h 05m1 stop Denver Intl

$329United Airlines

Wed, Aug 26 - Wed, Sep 2

1:20 pm - 5:37 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

5h 17m1 stop Denver Intl

5:00 am - 12:39 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

6h 39m1 stop Denver Intl

$332United Airlines

Sat, Oct 17 - Sun, Oct 18

1:20 pm - 9:03 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

8h 43m2 stops Denver Intl San Francisco

5:00 am - 12:39 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

6h 39m1 stop Denver Intl

$337United Airlines

Sat, Oct 17 - Sun, Oct 18

4:15 pm - 9:31 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

6h 16m1 stop Denver Intl

8:40 am - 5:18 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

7h 38m1 stop Denver Intl

$338United Airlines

Tue, Aug 25 - Sat, Aug 29

1:26 pm - 8:43 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

8h 17m2 stops Denver Intl San Francisco

3:54 pm - 9:59 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

5h 05m1 stop Denver Intl

$344United Airlines

Tue, Aug 25 - Sat, Aug 29

6:05 pm - 11:04 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

5h 59m1 stop Denver Intl

5:00 am - 10:48 amSEA Seattle/Tacoma Intl-CPR Casper Natrona County

4h 48m1 stop Denver Intl

$345United Airlines

Thu, Sep 3 - Sun, Sep 6

6:05 pm - 11:04 pmCPR Casper Natrona County-SEA Seattle/Tacoma Intl

5h 59m1 stop Denver Intl

5:00 am - 12:45 pmSEA Seattle/Tacoma Intl-CPR Casper Natrona County

6h 45m1 stop Denver Intl

$347United Airlines

Thu, Aug 27 - Mon, Aug 31

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United Airlines flights from Casper to Seattle

Our best United Airlines deals on Casper to Seattle flight tickets

United Airlines

Sep 19

CPR4:15 pmCasper Natrona County

6h 16m

1 stop

SEA9:31 pmSeattle/Tacoma Intl

Sep 20

SEA5:00 amSeattle/Tacoma Intl

4h 49m

1 stop

CPR10:49 amCasper Natrona County

$308

United Airlines

Sep 19

CPR11:24 amCasper Natrona County

10h 19m

2 stops

SEA8:43 pmSeattle/Tacoma Intl

Sep 20

SEA5:00 amSeattle/Tacoma Intl

4h 49m

1 stop

CPR10:49 amCasper Natrona County

$314

United Airlines

Aug 26

CPR7:05 amCasper Natrona County

5h 39m

1 stop

SEA11:44 amSeattle/Tacoma Intl

Sep 2

SEA8:40 amSeattle/Tacoma Intl

7h 38m

1 stop

CPR5:18 pmCasper Natrona County

$323

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Sat 9/19

4:15 pm-9:31 pm

1 stop6h 16m

Seattle/Tacoma Intl

Sun 9/20

5:00 am-10:49 am

1 stop4h 49m

$308

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Sat 9/19

11:24 am-8:43 pm

2 stops10h 19m

Seattle/Tacoma Intl

Sun 9/20

5:00 am-10:49 am

1 stop4h 49m

$314

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Wed 8/26

7:05 am-11:44 am

1 stop5h 39m

Seattle/Tacoma Intl

Wed 9/2

8:40 am-5:18 pm

1 stop7h 38m

$323

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Wed 8/26

7:05 am-2:24 pm

2 stops8h 19m

Seattle/Tacoma Intl

Wed 9/2

3:54 pm-9:59 pm

1 stop5h 05m

$329

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Sat 10/17

1:20 pm-5:37 pm

1 stop5h 17m

Seattle/Tacoma Intl

Sun 10/18

5:00 am-12:39 pm

1 stop6h 39m

$332

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Sat 10/17

1:20 pm-9:03 pm

2 stops8h 43m

Seattle/Tacoma Intl

Sun 10/18

5:00 am-12:39 pm

1 stop6h 39m

$337

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Tue 8/25

4:15 pm-9:31 pm

1 stop6h 16m

Seattle/Tacoma Intl

Sat 8/29

8:40 am-5:18 pm

1 stop7h 38m

$338

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Tue 8/25

1:26 pm-8:43 pm

2 stops8h 17m

Seattle/Tacoma Intl

Sat 8/29

3:54 pm-9:59 pm

1 stop5h 05m

$344

Quickest round-trip

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Thu 9/3

6:05 pm-11:04 pm

1 stop5h 59m

Seattle/Tacoma Intl

Sun 9/6

5:00 am-10:48 am

1 stop4h 48m

$345

CasperSeattle

CPR Casper Natrona County - SEA Seattle/Tacoma Intl

CPRSEA

Casper Natrona County

Thu 8/27

6:05 pm-11:04 pm

1 stop5h 59m

Seattle/Tacoma Intl

Mon 8/31

5:00 am-12:45 pm

1 stop6h 45m

$347

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 Casper 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, January is the cheapest month to fly from Casper to Seattle. Due to it being the ‘off-season’ during this time, you can expect flight prices to be around $0. If you don’t want to visit Seattle in January, then you should wait until May to fly from Casper, when ticket prices are also cheap, with an average price of $238.

When to book flights from Casper to Seattle

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

Estimated round-trip price

Cheap Casper to Seattle (CPR to SEA) flight deals and tips

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

Fastest flight time	5h 17m
Direct flights	None

The fastest flight from Casper to Seattle takes 5h 17m

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

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Frequently asked questions about flying from Casper to Seattle

How far is Casper Natrona County to Seattle/Tacoma Intl by plane?
Casper Natrona County and Seattle/Tacoma Intl are 843.3 mi apart from one another. Flights usually cover this in 5h 17m, depending on flying conditions and air traffic around both airports.
When did momondo last update prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
Prices for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport were last updated today.
How many operators does momondo search for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
As of August 2026, there is 1 operator available to choose from for flights from Casper Natrona County Airport to Seattle/Tacoma Intl Airport.
How old do you have to be to fly from Casper Natrona County Airport to Seattle/Tacoma Intl Airport?
The minimum age for a child to fly alone is five, but airlines offering an unaccompanied minor (UNMR) service may have their age restrictions, such as regulations concerning flight duration, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Casper Natrona County 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 Casper to Seattle?
Based on momondo bookings for this flight route, the most popular airline on flight routes from Casper to Seattle is United Airlines (100% of total bookings).

Best airlines flying from Casper to Seattle

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

Airline	Rating	Free Cancellation	Price
United Airlines	PriceFrom $238	Free Cancellation	Rating 7.4 10,111 reviews		Search United Airlines flights

Tacoma

Leavenworth

SeaTac

Ocean Shores

Renton

Olympia

Kent

Lynnwood

Redmond

Lakewood

Federal Way

Puyallup

Tukwila

Fife

Cle Elum

Marysville

Kirkland

Centralia

Shoreline

Lacey

Why use momondo?

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

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to Seattle from Casper.

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

Flights from Casper to Seattle with flexible booking policies can be found by using the search form above and then selecting our dedicated flexible booking filter, which will highlight only the flights where this policy is applied.

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

momondo helps you find the best flight between Casper and Seattle by providing filters to narrow your choice of flights to those matching your criteria. You can select flights based on numerous factors such as price, departure and landing times, airport and airline.

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

Yes momondo offers price alerts on flights to Seattle from Casper. After performing a search on this page you should be able to see the price alert set up feature. Simply provide a valid email address and momondo will instantly alert you when prices change.