What is the cheapest airline to fly from St. Louis to Santa Rosa round-trip?

American Airlines, at $346, was found to be the cheapest airline from St. Louis to Santa Rosa.. American Airlines is currently priced 44% below the average price you’ll pay for this route.

What is the cheapest day to fly from St. Louis to Santa Rosa?

Travelers seeking maximum savings on their St. Louis to Santa Rosa flight should consider departing on Monday mornings when fares are most often at their lowest. Wednesday mornings flights should be avoided if possible as fares are typically the most expensive at this time.

In terms of precipitation, rainfall in Santa Rosa ranges from 0.0 - 7.1 inches per month. January is typically the wettest month, when rainfall can reach 7.1 in. July is typically the driest time to visit Santa Rosa when rainfall is around 0.0 in.

If weather is an important factor for your trip to Santa Rosa, 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 68.0 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 46.4 F).

What is the cheapest day to fly round-trip from St. Louis to Santa Rosa?

Flights from St. Louis to Santa Rosa are found to be more expensive on Friday. This shouldn't discourage you from searching as you can still find great deals by being flexible with your options. Use our search form to find deals on tickets to Santa Rosa.

How far in advance should I book a flight from St. Louis to Santa Rosa?

Travelers have found it’s best to book a flight 43 days in advance to save up to 28% compared to booking the same week of travel. As your travel date approaches, the cost of this flight route may potentially increase. While opting to book 43 days out may not be an option for all, there are still additional ways to secure a deal in the near future. You might find a flight from St. Louis to Santa Rosa 1-2 weeks in advance for as low as $339, or $352 for flights within the next 24 hours.

What is the cheapest month to fly from St. Louis to Santa Rosa?

February can be a great time to fly to Santa Rosa from St. Louis with a flight ticket averaging about $383. Cheapflights users have found deals in the month of February for as cheap as $130. The most expensive prices can be found in the month of July.

What is the cheapest time of day to fly from STL to STS?

When flying from St. Louis to Santa Rosa, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Can I find deals for flights from St. Louis to Santa Rosa that include hotel bookings?

Yes. In addition to deals on St. Louis to Santa Rosa flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from St. Louis to Santa Rosa?

After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Santa Rosa.

Can I find deals for business class flights from St. Louis to Santa Rosa?

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

$223+ Flights from St. Louis to Santa Rosa

Q: How much does it cost to fly round-trip from St. Louis to Santa Rosa?

Airfare is below average for this route at the moment. St. Louis to Santa Rosa flights typically cost between $523 and $653 in January. The cheapest round-trip price found within the last 3 days was $403 on Alaska Airlines (Jan 10-Jan 13).

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Cheap flight deals from St. Louis to Santa Rosa

Round-trip from	$403 (Alaska Airlines)
One-way from	$223 (Alaska Airlines)
Popular in	April
Cheapest in	December
Average price	$616

From Lambert-St Louis to Santa Rosa Sonoma County

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One-way flight from Lambert-St Louis to Santa Rosa Sonoma County

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Highest demand for flights based on searches. 10% potential increase in price ($73 potential increase over avg. RT price).

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Cheapest flight prices on average. 3% potential price decrease ($23 potential savings vs. average RT price).

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Average for round-trip flights in August 2025

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Find flight deals from St. Louis to Santa Rosa

Cheapest flights from St. Louis to Santa Rosa
Explore the most affordable flight options available from St. Louis to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Thu 12/187:00 amSTL - STS

1 stop8h 32mAlaska Airlines

Sat 12/272:24 pmSTS - STL

1 stop7h 21mAlaska Airlines

Deal found 8/14

$524

Best flights from St. Louis to Santa Rosa
Discover carefully curated flight deals from St. Louis to Santa Rosa that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated August 14, 2025.

Sat 1/102:55 pmSTL - STS

2 stops21h 32mAlaska Airlines

Tue 1/133:30 pmSTS - STL

2 stops20h 22mAlaska Airlines

Deal found 8/13

$403

Thu 12/187:00 amSTL - STS

1 stop8h 32mAlaska Airlines

Sat 12/272:24 pmSTS - STL

1 stop7h 21mAlaska Airlines

Deal found 8/14

$524

One-way flights from St. Louis to Santa Rosa
Search for one-way flight options from St. Louis to Santa Rosa. Find affordable one-way fares based on user searches. Data last updated August 14, 2025.

Fri 9/196:30 pmSTL - STS

1 stop21h 06mAlaska Airlines

Deal found 8/14

$223

Wed 8/206:00 amSTL - STS

1 stop9h 36mAlaska Airlines

Deal found 8/13

$437

Mon 8/253:35 pmSTL - STS

1 stop24h 06mAlaska Airlines

Deal found 8/13

$443

Thu 8/216:00 amSTL - STS

2 stops15h 12mAlaska Airlines

Deal found 8/13

$448

Tue 8/196:41 amSTL - STS

1 stop8h 44mAlaska Airlines

Deal found 8/13

$489

Tue 8/195:15 amSTL - STS

2 stops12h 32mAmerican Airlines

Deal found 8/13

$570

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Santa Rosa that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Sat 1/10

2:55 pm-10:27 am

2 stops21h 32m

Santa Rosa Sonoma County

Tue 1/13

3:30 pm-1:52 pm

2 stops20h 22m

$403

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Thu 12/18

7:00 am-1:32 pm

1 stop8h 32m

Santa Rosa Sonoma County

Sat 12/27

2:24 pm-11:45 pm

1 stop7h 21m

$524

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Fri 9/19

6:30 pm-1:36 pm

1 stop21h 06m

$223

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Wed 8/20

6:00 am-1:36 pm

1 stop9h 36m

$437

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Thu 8/21

6:00 am-1:36 pm

1 stop9h 36m

$437

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Mon 8/25

3:35 pm-1:41 pm

1 stop24h 06m

$443

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 8/19

6:41 am-1:25 pm

1 stop8h 44m

$489

St. LouisSanta Rosa

STL - STS

STLSTS

Lambert-St Louis

Tue 8/19

5:15 am-3:47 pm

2 stops12h 32m

$570

Flights are sorted by cheapest round-trip flights first.

Deals found on 8/14

Best time to book a flight from St. Louis to Santa Rosa

Have a flexible travel schedule? Discover the best time to fly to Santa Rosa from St. Louis 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 St. Louis to Santa Rosa

What is the cheapest month to book a flight from St. Louis to Santa Rosa?

Currently, February is the cheapest month in which you can book a flight from St. Louis to Santa Rosa (average of $202). Flying from St. Louis to Santa Rosa in June is currently the most expensive (average of $395). 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.

How much does it cost to fly round-trip from St. Louis to Santa Rosa?

Reviews of airlines servicing Santa Rosa

Get a feel of what it's like to fly with American Airlines from St. Louis to Santa Rosa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

American Airlines

7.2

Good

10,000 reviews

American Airlines

7.2

Good

10,000 reviews

Reviews

1 / 20

10.0

Excellent

Anonymous,Jan 2024

LHR - SAN

This was the best flight I have experienced in all the years I have been f doing this journey with BA. Flight, food and service A1. Well done BA.

Related info for your journey

What is the cheapest airline to fly from St. Louis to Santa Rosa round-trip?
American Airlines, at $346, was found to be the cheapest airline from St. Louis to Santa Rosa.. American Airlines is currently priced 44% below the average price you’ll pay for this route.
Can I find deals for flights from St. Louis to Santa Rosa that include hotel bookings?
Yes. In addition to deals on St. Louis to Santa Rosa flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from St. Louis to Santa Rosa?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from St. Louis to Santa Rosa.
Can I find deals for business class flights from St. Louis to Santa Rosa?
Yes. Cheapflights offers flight deals from St. Louis to Santa Rosa 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 St. Louis to Santa Rosa?
Currently, February is the cheapest month in which you can book a flight from St. Louis to Santa Rosa (average of $202). Flying from St. Louis to Santa Rosa in June is currently the most expensive (average of $395). 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

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Ukiah

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Other flights to Santa Rosa

Top airline flying from St. Louis to Santa Rosa

Airline	Cheapest	Average	Flexibility	On-time
American Airlines	Cheapest$346	Average$638	FlexibilityNo cancel fee	On-time71%

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$223+ Cheap flights from St. Louis to Santa Rosa (STL - STS)

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 9/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from St. Louis to Santa Rosa with Cheapflights

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2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from St. Louis to Santa Rosa

Round-trip from

One-way from

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Find flight deals from St. Louis to Santa Rosa

Cheapest flights from St. Louis to Santa RosaExplore the most affordable flight options available from St. Louis to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Explore the most affordable flight options available from St. Louis to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from St. Louis to Santa Rosa that are best for you.

Best time to book a flight from St. Louis to Santa Rosa

Have a flexible travel schedule? Discover the best time to fly to Santa Rosa from St. Louis with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from St. Louis to Santa Rosa

What is the cheapest month to book a flight from St. Louis to Santa Rosa?

How much does it cost to fly round-trip from St. Louis to Santa Rosa?

Reviews of airlines servicing Santa Rosa

Get a feel of what it's like to fly with American Airlines from St. Louis to Santa Rosa by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Related info for your journey

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

What is the cheapest airline to fly from St. Louis to Santa Rosa round-trip?

Can I find deals for flights from St. Louis to Santa Rosa that include hotel bookings?

How can I find direct flights from St. Louis to Santa Rosa?

Can I find deals for business class flights from St. Louis to Santa Rosa?

What is the cheapest month to book a flight from St. Louis to Santa Rosa?

Traveling to a place near Santa Rosa?

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.

Alternative routes for St. Louis to Santa Rosa

See prices for flight routes from nearby airports that may be better suited for you.

Top airline flying from St. Louis to Santa Rosa

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Travel Smart

Cheapest flights from St. Louis to Santa Rosa
Explore the most affordable flight options available from St. Louis to Santa Rosa. Find the lowest fares from popular airlines and budget airlines, with prices last updated on August 14, 2025.