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Cheap flights from Seattle (SEA) to Boulder, CO from $23

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 5/26. Fares are subject to change and may not be available on all flights or dates of travel. Click the price to replicate the search for this deal.
SEA — DEN
May 21 — May 281
From?
To?
Tue 5/21
Tue 5/28
1 adult, Economy
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The best prices from Seattle/Tacoma Intl to Boulder are usually found in January or February, booked 71 days in advance, depart on a Wednesday or Saturday and return on a Tuesday

Cheap flight deals from Seattle to Boulder

Discover tips and strategies to find the most affordable flight options for your journey from Seattle (SEA) to Boulder (BD9). 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 May 16, 2024.

Popular in

June

Cheapest in

January

Round-trip from

$192

One-way from

$23
High demand for flights, 28% potential price rise
Search Deals
Best time to find cheap flights, 31% potential price drop
Search Deals
From Seattle/Tacoma Intl to Boulder
Search Deals
One-way flight from Seattle/Tacoma Intl to Boulder
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How far in advance should I book a flight from Seattle to Boulder?

When searching for a good deal, it’s best to be prepared for potential fluctuations in price. We recommend booking at least 35 days in advance, which can save you up to 70% on flights from Seattle to Boulder compared to booking the week you need them. Waiting 35 days out may not be for everyone, so we have options available for flights within the next two weeks, with the lowest price starting at $153. For sooner than that we have options available in the next 3 days from $308.

What is the cheapest month to fly from Seattle to Boulder?

Due to multiple factors, expect to potentially pay more when booking in June. For low rates, January can be a great choice for travel to Boulder. Flights to Boulder from Seattle in January are about $186 on average during January, but can be found for as low as $45.

When is the cheapest time to fly from Seattle to Boulder (SEA - BD9)?

Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Seattle to Boulder as you normally would.

Cheap Frontier flights from Seattle to Boulder

Explore cheap flight options specifically provided by Frontier for the route between Seattle and Boulder. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Peruse some of the lowest-priced Frontier flights we've found from Seattle to Boulder. Deals update often to give you more flight options matching your criteria
Tue 6/48:14 pmSEA - DEN
Nonstop3h 01mFrontier
Wed 6/55:01 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$55
Wed 9/410:08 pmSEA - DEN
Nonstop2h 43mFrontier
Sat 9/76:35 amDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/15$58
Sun 5/268:04 amSEA - DEN
Nonstop2h 52mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$63
Sat 6/110:08 pmSEA - DEN
Nonstop2h 53mFrontier
Fri 6/75:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$65
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Wed 6/125:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$66
Tue 6/48:14 pmSEA - DEN
Nonstop3h 01mFrontier
Mon 6/105:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$68
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Mon 6/36:35 amDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/15$70
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Fri 5/316:40 amDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/16$71
Sat 8/3110:08 pmSEA - DEN
Nonstop2h 43mFrontier
Wed 9/46:35 amDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/14$72

Cheap Sun Country Air flights from Seattle to Boulder

Explore cheap flight options specifically provided by Sun Country Air for the route between Seattle and Boulder. Find affordable fares and compare prices with other airlines to secure the best deal for your journey. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
To aid your search, here are some of the cheapest Sun Country Air flights we've found from Seattle to Boulder. Deals are refreshing constantly so come back soon for more options.
Sat 5/256:15 pmSEA - DEN
1 stop12h 25mSun Country Air
Sun 6/24:10 pmDEN - SEA
1 stop7h 40mSun Country Air
Deal found 5/15$163
Fri 5/3111:59 pmSEA - DEN
1 stop15h 56mSun Country Air
Thu 6/67:25 pmDEN - SEA
1 stop13h 43mSun Country Air
Deal found 5/15$173
Sat 5/256:15 pmSEA - DEN
1 stop12h 25mSun Country Air
Mon 5/276:30 pmDEN - SEA
1 stop14h 40mSun Country Air
Deal found 5/16$292

Cheap Seattle to Boulder flights in May & June 2024

Find cheap flight options from Seattle to Boulder specifically for the months of May and June 2024. Explore affordable fares based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Prices were last updated on May 16, 2024.
Scroll through some of the best deals on flights from Seattle to Boulder in 2024. If these deals don't appeal to you, be sure to come back soon for more options.
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Sat 6/17:03 pmDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/14$77
Mon 6/39:40 amSEA - DEN
Nonstop3h 01mFrontier
Fri 6/75:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$78
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/16$79
Wed 5/298:34 amSEA - DEN
Nonstop2h 52mFrontier
Sat 6/17:03 pmDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/15$80
Wed 6/129:41 pmSEA - DEN
Nonstop2h 53mFrontier
Wed 6/195:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$81
Mon 6/104:07 pmSEA - DEN
Nonstop2h 48mFrontier
Wed 6/125:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$82
Thu 6/611:28 amSEA - DEN
Nonstop2h 56mFrontier
Tue 6/115:10 pmDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$83
Tue 5/288:14 pmSEA - DEN
Nonstop3h 01mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$84
Thu 5/309:49 pmSEA - DEN
Nonstop2h 55mFrontier
Tue 6/45:12 pmDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/16$85

Seattle to Boulder 2024 flight deals

Discover exclusive flight deals for travel between Seattle and Boulder in 2024. Find excellent offers based on user searches. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Scroll through some of the best deals on flights from Seattle to Boulder in 2024. If these deals don't appeal to you, be sure to come back soon for more options.
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Sat 6/17:03 pmDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/14$77
Mon 6/39:40 amSEA - DEN
Nonstop3h 01mFrontier
Fri 6/75:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$78
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/16$79
Mon 8/1910:08 pmSEA - DEN
Nonstop2h 43mFrontier
Mon 8/266:35 amDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/15$80
Wed 6/129:41 pmSEA - DEN
Nonstop2h 53mFrontier
Wed 6/195:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$81
Mon 6/104:07 pmSEA - DEN
Nonstop2h 48mFrontier
Wed 6/125:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$82
Thu 6/611:28 amSEA - DEN
Nonstop2h 56mFrontier
Tue 6/115:10 pmDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$83
Tue 5/288:14 pmSEA - DEN
Nonstop3h 01mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$84
Thu 5/309:49 pmSEA - DEN
Nonstop2h 55mFrontier
Tue 6/45:12 pmDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/16$85

Non-stop flights to Boulder from Seattle

Discover non-stop flight options from Seattle to Boulder. Find direct flights with no layovers, providing a convenient travel experience. Explore non-stop flight options based on user searches, and compare prices and availability for your desired travel dates. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
If you're seeking options on non-stop flights from Seattle to Boulder, check out these fares. Users seeking other options on flights from Seattle to Boulder should update the search form at the top of the page.
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Sat 6/17:03 pmDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/14$77
Mon 6/39:40 amSEA - DEN
Nonstop3h 01mFrontier
Fri 6/75:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$78
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/16$79
Wed 5/298:34 amSEA - DEN
Nonstop2h 52mFrontier
Sat 6/17:03 pmDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/15$80
Wed 6/129:41 pmSEA - DEN
Nonstop2h 53mFrontier
Wed 6/195:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$81
Mon 6/104:07 pmSEA - DEN
Nonstop2h 48mFrontier
Wed 6/125:06 amDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$82
Thu 6/611:28 amSEA - DEN
Nonstop2h 56mFrontier
Tue 6/115:10 pmDEN - SEA
Nonstop3h 00mFrontier
Deal found 5/15$83
Tue 5/288:14 pmSEA - DEN
Nonstop3h 01mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$84
Thu 5/309:49 pmSEA - DEN
Nonstop2h 55mFrontier
Tue 6/45:12 pmDEN - SEA
Nonstop3h 02mFrontier
Deal found 5/16$85

Seattle to Boulder flights leaving soon

Find last-minute flight options from Seattle to Boulder for spontaneous travel. Discover available flights and compare prices based on user searches. Secure great deals and offers for spontaneous trips with quick booking options. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Book one of these great deals on flights from Seattle to Boulder. It's wise to confirm all flight details are correct before booking.
Wed 5/228:04 amSEA - DEN
Nonstop2h 52mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/15$78
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/16$79
Sat 5/2510:22 amSEA - DEN
Nonstop2h 57mFrontier
Mon 6/36:35 amDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/16$85
Wed 5/228:04 amSEA - DEN
Nonstop2h 52mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$89
Thu 5/239:49 pmSEA - DEN
Nonstop2h 55mFrontier
Wed 5/295:31 amDEN - SEA
Nonstop3h 03mFrontier
Deal found 5/16$93
Wed 5/228:04 amSEA - DEN
Nonstop2h 52mFrontier
Fri 5/316:40 amDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/16$99
Wed 5/228:04 amSEA - DEN
Nonstop2h 52mFrontier
Thu 5/236:25 amDEN - SEA
Nonstop3h 05mFrontier
Deal found 5/15$103
Sat 5/2510:08 pmSEA - DEN
Nonstop2h 53mFrontier
Thu 5/306:45 pmDEN - SEA
Nonstop3h 04mFrontier
Deal found 5/16$105
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mMultiple Airlines
Sun 6/24:10 pmDEN - SEA
1 stop7h 40mMultiple Airlines
Deal found 5/15$109

One-way flights to Boulder from Seattle

Search for one-way flight options from Seattle to Boulder. Find affordable one-way fares based on user searches. Compare prices and availability to plan your one-way journey according to your preferred dates and budget. Over the last 7 days, Cheapflights users made 2,637,452 searches. Data last updated May 16, 2024.
Users in need of a one-way flight from Seattle to Boulder can choose from these deals. For those needing a return trip from Seattle, there is a search form available above.
Sun 5/269:39 pmSEA - DEN
Nonstop2h 55mFrontier
Deal found 5/15$23
Wed 5/298:34 amSEA - DEN
Nonstop2h 52mFrontier
Deal found 5/15$28
Sat 6/110:22 amSEA - DEN
Nonstop2h 57mFrontier
Deal found 5/15$29
Wed 6/129:41 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 5/16$36
Wed 6/129:41 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 5/15$37
Thu 5/309:49 pmSEA - DEN
Nonstop2h 55mFrontier
Deal found 5/15$38
Mon 8/1910:08 pmSEA - DEN
Nonstop2h 43mFrontier
Deal found 5/15$39
Tue 7/28:12 pmSEA - DEN
Nonstop2h 58mFrontier
Deal found 5/15$41
Fri 5/2410:24 pmSEA - DEN
Nonstop2h 53mFrontier
Deal found 5/14$43

Find flights from Seattle to Boulder within your budget

Customize your flight search to find flights from Seattle to Boulder 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 2,637,452 searches. Data last updated May 16, 2024.

Fly from

Any airport

Fly to

Any airport

Budget

$55 - $173

Route

Depart

Return

Price

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 6/4

Nonstop3h 01m

Denver Intl

Wed 6/5

Nonstop3h 00m

$55

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Wed 9/4

Nonstop2h 43m

Denver Intl

Sat 9/7

Nonstop3h 02m

$58

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 5/26

Nonstop2h 52m

Denver Intl

Wed 5/29

Nonstop3h 03m

$63

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 6/1

Nonstop2h 53m

Denver Intl

Fri 6/7

Nonstop3h 00m

$65

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 6/1

Nonstop2h 57m

Denver Intl

Wed 6/12

Nonstop3h 00m

$66

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Tue 6/4

Nonstop3h 01m

Denver Intl

Mon 6/10

Nonstop3h 00m

$68

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sat 6/1

Nonstop2h 57m

Denver Intl

Mon 6/3

Nonstop3h 05m

$70

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Sun 5/26

Nonstop2h 55m

Denver Intl

Sun 6/2

1 stop7h 40m

$109

Seattle/Tacoma IntlDenver Intl

SEA - DEN

SEADEN

Seattle/Tacoma Intl

Fri 5/31

1 stop15h 56m

Denver Intl

Thu 6/6

1 stop13h 43m

$173

Flights are sorted by cheapest first

Deals found on 5/15

When is the best time to book a flight from Seattle to Boulder?

Use this chart to determine the optimal time to book a round-trip flight from Seattle to Boulder. Price data was last updated on May 10, 2024.
Booking 71 days in advance of your planned departure date is, on average, the best time to get cheap flights from Seattle to Boulder. The general trend is that the closer you book to the departure date, the more expensive your flight will be.
Search Deals

When is the cheapest time to fly from Seattle to Boulder?

Use this chart to determine the cheapest time to fly round-trip from Seattle to Boulder. Price data was last updated on May 12, 2024.
Morning
Noon
Afternoon
Evening
All times are departure.
Travelers seeking maximum savings on their Seattle to Boulder flight should consider departing on Saturday afternoons when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.
Search Deals

Average price of flights to Boulder by month

Plan your trip from Seattle to Boulder by taking into account the cheapest months to travel. The average price of a one-way flight from Seattle to Boulder is currently $35 while a round-trip flight costs $81. Price data was last updated on May 12, 2024.

Currently, December is the cheapest month in which you can book a flight from Seattle to Boulder (average of $192). Flying from Seattle to Boulder in June is currently the most expensive (average of $277). 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.

January

$221

February

$237

March

$269

April

$204

May

$223

June

$277

July

$277

August

$214

September

$210

October

$194

November

$198

December

$192

Temperature and rainfall in Boulder by month

Plan your trip to Boulder by taking into account the average temperature and rainfall totals by month.

DEN

Temperature

30.2 - 73.4 °F

Reviews of airlines servicing Boulder

Get insights into the airlines that provide service to Boulder. 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 Boulder. Reviews last updated May 16, 2024.
To help decide which airline to fly from Seattle to Boulder, see what other customers have to say about Frontier, Sun Country Air and Delta. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Southwest
8.2
Very good
6,040 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Alaska Airlines
8.1
Very good
9,157 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Delta
8.0
Very good
10,673 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

WestJet
7.5
Good
2,919 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

United Airlines
7.4
Good
10,924 reviews
Southwest
8.2
Very good
6,040 reviews
Check prices

Crew

8.7

Overall

8.2

Comfort

8.1

Food

7.3

Entertainment

7.8

Boarding

8.3

Reviews

1 / 10

Wish the there were an electrical outlet to plug the phone. it died within 10 minutes of being in the air.

Related info for your journey

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

  • What airport do you fly from for flights from Seattle to Boulder?

    Seattle/Tacoma Intl (SEA) is the airport you will fly out of if you book a flight from Seattle to Boulder. You should not have trouble finding flights to Boulder from Seattle/Tacoma Intl; the airport handles an average of 31 outbound flights to Boulder per day. You should also have plenty of airline options to choose from since 7 airlines have flights from the Seattle airport to Boulder. It is only a 11.4 mi journey to Seattle/Tacoma Intl (SEA) from Seattle’s city center.

  • Can I find flights from Seattle to Boulder for under $100 on Cheapflights?

    Yes, there are multiple flights from Seattle to Boulder for under $100. The cheapest flight booked recently is on Frontier for just $55, but on average you can expect to pay $72.

  • Are there nonstop flights from Seattle to Boulder for under $100 on Cheapflights?

    Cheapflights has at least 20 direct flights from Seattle to Boulder under $100. A good price for a nonstop flight from Seattle to Boulder is less than $86.

  • Are there last-minute flights available from Seattle to Boulder for under $100?

    There are currently 20+ open flights from Seattle to Boulder within the next 7 days for less than $100.

  • What days are nonstop flights available from Seattle to Boulder?

    Nonstop flights can be found on the following days: Sunday, Monday, Tuesday, Thursday, Friday, Saturday.

  • How popular is this Seattle to Boulder flight route?

    Flights from Seattle/Tacoma Intl to Boulder have been viewed 283 times in the past calendar month.

  • How many flights depart from Seattle to Boulder on average per day?

    52 flight departures from Seattle to Boulder per day on average.
    Early Morning (Midnight to 6am) - 15% of flight departures
    Morning (6am - Noon) - 46% of flight departures
    Afternoon (Noon - 6pm) - 23% of flight departures
    Evening (6pm - Midnight) - 15% of flight departures

  • How long is the flight from Seattle to Boulder?

    There are many flights that can get you from Seattle to Boulder in 3h 01m. Fly via Frontier to get the fastest option. Airlines will cover a distance of 1028 mi. Generally, flights for this route are nonstop.

  • What are the most popular airlines that fly from Seattle to Boulder?

    Undisclosed Carrier, American Airlines and Alaska Airlines are the most popular airlines when flying from Seattle to Boulder.

  • What are the most reliable airlines from Seattle to Boulder?

    Before booking your flight to Boulder from Seattle, check out the most reliable airlines to get you to your destination on time: SkyWest Airlines (100%), Air France (93%), WestJet( 87%).

  • What are the cheapest flights from Seattle to Boulder?

    Looking for the cheapest flight from Seattle to Boulder? While on average our users pay $568, our data indicates the cheapest price to be $48. The most popular route (Seattle/Tacoma Intl - Denver Intl), is priced around $115.

  • What does SEA to DEN mean?

    This is defined as Seattle/Tacoma Intl Airport (SEA) and Denver Intl Airport (DEN). Codes like Denver Intl Airport are often used to just call airports uniquely. Colorado Springs Airport (COS), Vail Eagle County Airport (EGE), Cheyenne Airport (CYS), Denver Arapahoe Co Airport (APA), Loveland Northern Colorado Airport (FNL) are other airports near this flight route and their unique identifiers/IATA codes.

  • Can I find deals for flights from Seattle to Boulder that include extra baggage allowance?

    The amount of baggage you can bring on your Seattle to Boulder flight depends on the airline and the type of fare you've chosen. After entering your flight details, you'll be able to view the specific baggage policies for each deal in the search results. Keep in mind that certain deals may offer additional baggage allowance.

  • Can I find deals on flights from Seattle to Boulder with specific airlines?

    Yes, Cheapflights allows you to browse and filter Seattle to Boulder flight deals by airline. After entering your origin and destination, use the available filters to view flights offered by airlines.

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

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

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

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

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

    Yes. Cheapflights offers flight deals from Seattle to Boulder by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • Can I find deals for flights from Seattle to Boulder that allow pets onboard?

    Many airlines flying from Seattle to Boulder offer the option to travel with pets. After selecting a flight deal, you can find more information about the airline's pet policy on their official website or by contacting the airline directly. Please note that additional fees and restrictions may apply.

  • Can I find deals on last-minute flights from Seattle to Boulder?

    Yes, you can often find last-minute deals on Seattle to Boulder flights on Cheapflights. However, these deals can vary and may not always be available. We recommend checking back frequently or signing up for price alerts for the most up-to-date deals.

  • How recently were the Seattle to Boulder flight deals updated?

    The Seattle to Boulder flight deals you see on this page were last updated on 5/16.

See more FAQs

Browse thousands of different options on Cheapflights for your next trip

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Top 6 airlines flying from Seattle to Boulder

Discover the top 6 airlines that operate flights from Seattle to Boulder. 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 2,637,452 searches. Data last updated May 16, 2024.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$40Average$120FlexibilityNo cancel feeOn-time62%
Search Frontier flights
Spirit AirlinesCheapest$62Average$194FlexibilityNo cancel feeOn-time65%
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DeltaCheapest$79Average$302FlexibilityNo cancel feeOn-timeN/A
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Alaska AirlinesCheapest$89Average$240FlexibilityNo cancel feeOn-time75%
Search Alaska Airlines flights
United AirlinesCheapest$99Average$423FlexibilityNo cancel feeOn-time69%
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American AirlinesCheapest$177Average$409FlexibilityNo cancel feeOn-time71%
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Search flights from Seattle to Boulder by cabin class

Find flights from Seattle to Boulder, based on your preferred cabin class, be it economy, premium economy, business, or first class.
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Hourly flight availability from Seattle to Boulder

Find hourly flight availability from Seattle to Boulder. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 16, 2024.
10%of flight departuresEarly morningMidnight to 6 am
46%of flight departuresMorning6 am to noon
18%of flight departuresAfternoonNoon to 6 pm
26%of flight departuresEvening6 pm to midnight
Midnight
6 AM
Noon
6 PM

Weekly flight availability from Seattle to Boulder

Explore weekly flight availability from Seattle to Boulder. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated May 16, 2024.
Sunday31daily flights
Monday37daily flights
Tuesday27daily flights
Wednesday24daily flights
Thursday35daily flights
Friday36daily flights
Saturday29daily flights

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Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Seattle to Boulder?

When you search for this flight from Seattle to Boulder, Cheapflights searches on 900+ travel sites to save you time finding great flight deals online. Additionally, we offer filter features so you can choose a preferred cabin class or airline, see different price ranges, and much more so you can book the flight for you.

Why should you use Cheapflights to find cheap flight tickets from Seattle to Boulder?

Cheapflights simply makes it quick and affordable to book flights from Seattle to Boulder by bringing together all flight options from hundreds of airlines and agencies online — and put it in one place for you to choose from. Plus, Cheapflights is 100% free to use for all.

Can Cheapflights find flights from Seattle to Boulder with no change fees?

Yes! Cheapflights helps users easily find flights from Seattle to Boulder with no change fees.

Can Cheapflights notify me if prices for flights from Seattle to Boulder become cheaper?

Yes! Start tracking prices for Seattle to Boulder flights today and get alerted whenever prices for these flights change. To access this feature, click the bell icon next to the flight deals above, which will prompt you for a valid email address to receive your alerts.

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