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$140+ Cheap flights from Washington, D.C. (WAS) to Seattle (SEA)

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 7/4. Fares are subject to change and may not be available on all flights or dates of travel.
WAS — SEA
Jun 17 — Jun 241
Tue 6/17
Tue 6/24
1 adult, Economy
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Cheapflights Tip: The best prices from Washington, D.C. to Seattle/Tacoma Intl are usually found in September or October, booked 43 days in advance, depart on a Tuesday or Wednesday and return on a Thursday

Cheap flight deals from Washington, D.C. to Seattle

Discover tips and strategies to find the most affordable flight options for your journey from Washington, D.C. (WAS) to Seattle (SEA). 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 June 12, 2025.

Round-trip from

$227
(Delta)

One-way from

$140
(Delta)

Popular in

December

Cheapest in

September

Average price

$450

Good round-trip deal

$346 or less

Good one-way deal

$189 or less
From Washington, D.C. (WAS) to Seattle/Tacoma Intl
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One-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl
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Highest demand for flights based on searches. 3% potential increase in price ($12 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($9 potential savings vs. average RT price).
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Average for round-trip flights in June 2025
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Price to beat on a round-trip flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
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Price to beat on a one-way flight from Washington, D.C. (WAS) to Seattle/Tacoma Intl.
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Find flight deals from Washington, D.C. to Seattle

Cheapest flights from Washington, D.C. to Seattle
Explore the most affordable flight options available from Washington, D.C. to Seattle. Find the lowest fares from popular airlines and budget airlines, with prices last updated on June 12, 2025.

This Delta deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Delta is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 9/207:15 amBWI - SEA
1 stop10h 44mDelta
Mon 9/297:33 pmSEA - BWI
1 stop7h 29mDelta
Deal found 6/10$227
This American Airlines deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 9/26:20 pmBWI - SEA
1 stop8h 20mAmerican Airlines
Tue 9/93:00 pmSEA - BWI
1 stop16h 54mAmerican Airlines
Deal found 6/11$231
This United Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure United Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/2110:51 amBWI - SEA
2 stops10h 11mUnited Airlines
Sun 11/211:50 pmSEA - BWI
1 stop7h 09mUnited Airlines
Deal found 6/10$256
This Kiwi.com deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/116:00 pmDCA - SEA
1 stop9h 31mFrontier
Tue 10/216:00 amSEA - DCA
1 stop8h 01mFrontier
Deal found 6/10$256
This Cheapflightsfares deal was found by Cheapflights users on 6/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/86:00 amBWI - SEA
1 stop12h 03mSpirit Airlines
Sat 7/125:30 pmSEA - BWI
1 stop9h 35mSpirit Airlines
Deal found 6/11$257
This American Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/217:00 amDCA - SEA
1 stop8h 33mAmerican Airlines
Sun 11/211:45 amSEA - DCA
1 stop7h 15mAmerican Airlines
Deal found 6/10$257
This Frontier deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 9/196:49 pmBWI - SEA
1 stop8h 42mFrontier
Mon 9/226:00 amSEA - BWI
1 stop9h 04mFrontier
Deal found 6/10$260
This FlightHub deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 9/38:00 amBWI - SEA
1 stop10h 53mMultiple Airlines
Mon 9/86:00 amSEA - BWI
1 stop9h 04mMultiple Airlines
Deal found 6/10$263
This American Airlines deal was found by Cheapflights users on 6/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure American Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 7/291:06 pmIAD - SEA
1 stop10h 35mAmerican Airlines
Tue 8/59:41 pmSEA - IAD
1 stop9h 12mAmerican Airlines
Deal found 6/9$267
This FlightHub deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure FlightHub is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 8/187:30 amIAD - SEA
1 stop9h 36mFrontier
Thu 8/283:25 pmSEA - IAD
1 stop12h 05mFrontier
Deal found 6/10$270
This Alaska Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 8/236:09 pmIAD - SEA
Nonstop5h 42mAlaska Airlines
Tue 8/2611:30 pmSEA - IAD
Nonstop5h 02mAlaska Airlines
Deal found 6/10$277
This Alaska Airlines deal was found by Cheapflights users on 6/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Alaska Airlines is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/147:22 pmBWI - SEA
Nonstop5h 43mAlaska Airlines
Tue 9/239:29 pmSEA - BWI
Nonstop5h 04mAlaska Airlines
Deal found 6/10$277

Cheapflights Fare Finder

Customize your flight search to find flights from Washington, D.C. to Seattle 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 2,558,603 searches. Data last updated June 12, 2025.
Use the filters below to find and compare flights from Washington, D.C. to Seattle that are best for you.

Fly from

Washington, D.C.

Fly to

Seattle

Route

Depart

Return

Price

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Mon 8/25

7:15 am-2:43 pm

1 stop10h 28m

Seattle/Tacoma Intl

Sat 9/6

5:45 pm-6:00 am

1 stop9h 15m

$227

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Tue 9/2

6:20 pm-11:40 pm

1 stop8h 20m

Seattle/Tacoma Intl

Tue 9/9

3:00 pm-10:54 am

1 stop16h 54m

$231

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 9/3

10:51 am-6:49 pm

2 stops10h 58m

Seattle/Tacoma Intl

Sat 9/6

11:54 pm-9:55 am

1 stop7h 01m

$256

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Tue 7/8

6:00 am-3:03 pm

1 stop12h 03m

Seattle/Tacoma Intl

Thu 7/10

5:30 pm-6:05 am

1 stop9h 35m

$257

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Sun 9/7

6:49 pm-12:31 am

1 stop8h 42m

Seattle/Tacoma Intl

Mon 9/15

6:00 am-6:04 pm

1 stop9h 04m

$260

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/20

1:00 pm-11:01 pm

1 stop13h 01m

Seattle/Tacoma Intl

Sun 8/24

6:17 am-4:59 pm

1 stop7h 42m

$261

BaltimoreSeattle

BWI - SEA

BWISEA

Baltimore/Washington

Wed 9/3

8:00 am-3:53 pm

1 stop10h 53m

Seattle/Tacoma Intl

Mon 9/8

6:00 am-6:04 pm

1 stop9h 04m

$263

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Tue 7/29

1:06 pm-8:41 pm

1 stop10h 35m

Seattle/Tacoma Intl

Tue 8/5

9:41 pm-9:53 am

1 stop9h 12m

$267

Washington, D.C.Seattle

DCA - SEA

DCASEA

Washington, D.C. Reagan-National

Wed 8/13

6:00 pm-11:40 pm

1 stop8h 40m

Seattle/Tacoma Intl

Wed 8/20

1:55 pm-1:16 am

1 stop8h 21m

$267

Washington, D.C.Seattle

IAD - SEA

IADSEA

Washington, D.C. Dulles Intl

Mon 8/18

7:30 am-2:06 pm

1 stop9h 36m

Seattle/Tacoma Intl

Thu 8/28

3:25 pm-6:30 am

1 stop12h 05m

$270

Flights are sorted by cheapest round-trip flights first.

Deals found on 6/11

Showing 1-10 of 54 results
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The best insider tips for Washington, D.C. to Seattle flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your Washington, D.C. to Seattle trip
Airports
DCA

DCA has two parking garages and an economy lot. Reserve online as lots fill quickly, especially during busy times.

Read more about DCAby Emily Zemler
IAD

The Aerotrain connects IAD terminals, but walking can be lengthy. Pay attention to signage for the right train direction.

Read more about IADby Ramsey Qubein
SEA

Use the Link light rail from SEA to downtown Seattle. It's affordable, runs every 10 minutes, and takes under 40 minutes.

Read more about SEAby Brandon Schultz
Our travel experts
Emily Zemler

Emily Zemler

Expert on DCA

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more
Ramsey Qubein

Ramsey Qubein

Expert on IAD

Ramsey Qubein

Ramsey Qubein

An avid traveler and aviation expert who has visited 173 countries, all 50 states and seven continents, Ramsey Qubein flies nearly 400,000 miles a year. As a North Carolina-based freelance journalist for publications including Conde Nast Traveler, Forbes, USA Today and Bloomberg among others, he explores the latest trends in aviation, hospitality, cruises and business.

Read more
Brandon Schultz

Brandon Schultz

Expert on SEA

Brandon Schultz

Brandon Schultz

Brandon Schultz is an award-winning food and travel writer based in New York City. His work has appeared in Forbes, AAA, Thrillist, Travel + Leisure, and The Daily Meal, among many others, and he is the author of 6 books, including 3 cookbooks.

Read more

Best time to book a flight from Washington, D.C. to Seattle

Have a flexible travel schedule? Discover the best time to fly to Seattle from Washington, D.C. with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Washington, D.C. to Seattle

How far ahead should I book a flight from Washington, D.C. to Seattle?

Use this chart to determine the optimal time to book a round-trip flight from Washington, D.C. to Seattle. Price data was last updated on June 9, 2025.

The best time to book flights from Washington, D.C. to Seattle is 43 days before your desired departure date. The cost of your flight will likely increase significantly if you book two weeks in advance of your flight.

What is the cheapest month to book a flight from Washington, D.C. to Seattle?

Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $238). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $391). 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.

What is the cheapest time of day to fly from WAS to SEA?

Find hourly flight availability from Washington, D.C. to Seattle. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated June 12, 2025.

It’s typically best to fly out from Washington, D.C. to Seattle in the evening. Doing so could potentially save you 21% on the flight price compared to flying in the morning, which is usually more expensive.

What is the cheapest day to fly from Washington, D.C. to Seattle?

Use this chart to determine the cheapest time to fly round-trip from Washington, D.C. to Seattle. Price data was last updated on June 8, 2025.

Travelers seeking maximum savings on their Washington, D.C. to Seattle flight should consider departing on Sunday at noon when fares are most often at their lowest. Sunday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

Weekly flight availability from Washington, D.C. to Seattle

Explore weekly flight availability from Washington, D.C. to Seattle. 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 June 12, 2025.

The most flights from WAS to SEA are scheduled on a Thursday (40 on average). You will have fewer flight options on Saturday, which is when the least amount of flights are scheduled (16 on average).

Rainfall in Seattle by month

Plan your trip to Seattle by taking into account the average rainfall totals by month.

In terms of precipitation, rainfall in Seattle ranges from 0.7 - 6.6 inches per month. November is typically the wettest month, when rainfall can reach 6.6 in. July is typically the driest time to visit Seattle when rainfall is around 0.7 in.

Temperature in Seattle by month

Plan your trip to Seattle by taking into account the average temperature totals by month.

If weather is an important factor for your trip to Seattle, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 41.0 F).

Reviews of airlines servicing Seattle

Get insights into the airlines that provide service to Seattle. 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 Seattle. Reviews last updated June 12, 2025.
See what other customers who have flown with Alaska Airlines, Southwest and Delta from Washington, D.C. to Seattle have to say. You can also see how each airline stacks up in terms of entertainment options, comfort, food, crew/service, and boarding process.
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Alaska Airlines
8.0
Very good
10,000 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Southwest
8.0
Very good
4,287 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Delta
8.0
Very good
7,946 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
Hawaiian Airlines
7.9
Good
2,494 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them
United Airlines
7.4
Good
8,790 reviews
Alaska Airlines
8.0
Very good
10,000 reviews

Overall

8.0

Food

7.1

Boarding

8.1

Comfort

7.8

Entertainment

7.1

Crew

8.5

Reviews

1 / 20
10.0
Excellent

Cheri,Jan 2025

FAT - SEA

Very friendly. I really liked that they had water for us in cartons not plastic. Impressed with Alaska Airlines, First time I had flown them

Related info for your journey

Find useful and relevant information for your journey from Washington, D.C. to Seattle. 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 into for flights to Seattle from Washington, D.C.?

    Seattle/Tacoma Intl (SEA), located 11.4 mi from the city center, is the airport you fly into when you book flights from Washington, D.C. to Seattle. 9 airlines have flights to Seattle/Tacoma Intl from Washington, D.C. on a regular basis. Booking flights from Washington, D.C. to Seattle/Tacoma Intl should not be difficult; the airport handles an average of 29 inbound flights from Washington, D.C. per day.

  • How popular is this Washington, D.C. to Seattle flight route?

    Flights from Washington, D.C. to Seattle/Tacoma Intl have been viewed 31 times in the past calendar month.

  • What are the cheapest airlines flying from Washington, D.C. to Seattle round-trip?

    According to our current data, Delta ($227), American Airlines ($231), and United Airlines ($256) offers the cheapest pricing from Washington, D.C. to Seattle. You may be able to fly from Washington, D.C. to Seattle for 44% less than the average price by searching for these airlines.

  • What are the cheapest airlines to fly from Washington, D.C. to Seattle one-way?

    For one-way options, check prices for Delta. According to our data, you can fly for as low as $140. Users have also found prices from $145 and $148 on Sun Country Air and Alaska Airlines, respectively.

  • What are the most popular routes from Washington, D.C. to Seattle?

    The most popular flight routes from Washington, D.C. to Seattle are Washington, D.C. Dulles Intl - Seattle/Tacoma Intl, Washington, D.C. Reagan-National - Seattle/Tacoma Intl and Baltimore/Washington - Seattle/Tacoma Intl.

  • What are the most reliable airlines from Washington, D.C. to Seattle?

    Consider Finnair (71%), Alaska Airlines (59%) or Hawaiian Airlines (59%) when booking your flight. These represent the most reliable airlines when flying from Washington, D.C. to Seattle.

  • What are the cheapest flights from Washington, D.C. to Seattle?

    Looking for the cheapest flight from Washington, D.C. to Seattle? While on average our users pay $1,830, our data indicates the cheapest price to be $168. The most popular route (Washington, D.C. Dulles Intl - Seattle/Tacoma Intl), is priced around $277.

  • Can I find deals for flights from Washington, D.C. to Seattle that include hotel bookings?

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

  • How can I find direct flights from Washington, D.C. to Seattle?

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

  • Can I find deals for business class flights from Washington, D.C. to Seattle?

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

  • What is the cheapest month to book a flight from Washington, D.C. to Seattle?

    Currently, January is the cheapest month in which you can book a flight from Washington, D.C. to Seattle (average of $238). Flying from Washington, D.C. to Seattle in July is currently the most expensive (average of $391). 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.

See more FAQs

Traveling to a place near Washington, D.C.?

Book flights to Washington, D.C. if you plan to visit one of these locations
SeaTac
Tukwila
Tacoma
Lakewood
Ocean Shores
Lacey
Leavenworth
Federal Way
Lynnwood
Olympia
Shoreline
Kent
Cle Elum
Centralia
Kirkland
Aberdeen
Renton
Shelton
Silverdale
Issaquah

Browse thousands of different options on Cheapflights for your next trip

Toggle through the tabs below to find thousands of options on Cheapflights for your next trip.

Top 9 airlines flying from Washington, D.C. to Seattle

Discover the top 9 airlines that operate flights from Washington, D.C. to Seattle. 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 2,558,603 searches. Data last updated June 12, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$111Average$243FlexibilityNo cancel feeOn-time62%
Spirit AirlinesCheapest$140Average$262FlexibilityNo cancel feeOn-time65%
Sun Country AirCheapest$144Average$386FlexibilityNo cancel feeOn-time83%
Hawaiian AirlinesCheapest$168Average$443FlexibilityNo cancel feeOn-time85%
American AirlinesCheapest$206Average$459FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$380FlexibilityNo cancel feeOn-timeN/A
Alaska AirlinesCheapest$262Average$485FlexibilityNo cancel feeOn-time75%
United AirlinesCheapest$273Average$431FlexibilityNo cancel feeOn-time69%
SouthwestCheapest$306Average$511FlexibilityNo cancel feeOn-time63%

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