How popular is this Colorado to San Antonio flight route?

This flight path from Colorado to San Antonio was viewed by 21 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

What are the cheapest airlines to fly from Colorado to San Antonio one-way?

For one-way options, check prices for Frontier. According to our data, you can fly for as low as $67. Users have also found prices from $99 and $108 on Southwest and United Airlines, respectively.

What are the most popular routes from Colorado to San Antonio?

When deciding which route to take from Colorado to San Antonio consider Denver Intl - San Antonio, Colorado Springs - San Antonio or Grand Junction Regnl - San Antonio as they are the most popular.

What are the cheapest flights from Colorado to San Antonio?

On average you can expect to pay $183 for a flight from Colorado to San Antonio. The cheapest flight overall is $78 while the most popular route, (Denver Intl - San Antonio) is currently priced at $175.

What are the most reliable airlines from Colorado to San Antonio?

Consider United Airlines (85%), Air Canada (83%) or Southwest (82%) when booking your flight. These represent the most reliable airlines when flying from Colorado to San Antonio.

What are the most popular airlines that fly from Colorado to San Antonio?

Consider American Airlines, Frontier or United Airlines when booking your flight. These represent the most popular airlines when flying from Colorado to San Antonio.

How far in advance should I book a flight from Colorado to San Antonio?

Travelers have found it’s best to book a flight 23 days in advance to save up to 67% 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 23 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 Colorado to San Antonio 1-2 weeks in advance for as low as $133, or $289 for flights within the next 24 hours.

What is the cheapest month to fly from Colorado to San Antonio?

The best pricing can be found in the month of August. Prices to San Antonio from Colorado average $206. You can even find prices in August for less than $206, as users have found deals to San Antonio from as low as $36. The month of December appears to be one of the more expensive times to travel to San Antonio from Colorado. Flying in the targeted month can save you up to 54%.

What airport do you fly into for flights to San Antonio from Colorado?

Located just 7.6 mi from the city center, San Antonio (SAT) is the airport most travelers will use when flying to San Antonio from Colorado.

Can I find deals for flights from Colorado to San Antonio that include hotel bookings?

Yes. In addition to deals on Colorado to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.

How can I find direct flights from Colorado to San Antonio?

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

Can I find deals for business class flights from Colorado to San Antonio?

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

$67+ Flights from Colorado to San Antonio

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Cheap flight deals from Colorado to San Antonio

Most accurate provider	FlightHub 3 stars
Most trusted provider	eDreams 3 stars
Round-trip from	$138 (Frontier)
One-way from	$67 (Cheapflightsfares)
Popular in	December
Cheapest in	August
Average price	$186
Good round-trip deal	$178 or less
Good one-way deal	$109 or less

Provider with most accurate pricing for Denver Intl-San Antonio flight deals.

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Provider most trusted by Cheapflights users for Denver Intl-San Antonio flights.

Search Deals

From Colorado to San Antonio

Search Deals

One-way flight from Colorado to San Antonio

Search Deals

Highest demand for flights based on searches. 24% potential increase in price ($65 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 5% potential price decrease ($11 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in May 2025

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Price to beat on a round-trip flight from Colorado to San Antonio.

Search Deals

Price to beat on a one-way flight from Colorado to San Antonio.

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Find flight deals from Colorado to San Antonio

Cheapest flights from Colorado to San Antonio
Explore the most affordable flight options available from Colorado to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Thu 7/243:55 pmDEN - SAT

Nonstop2h 18mFrontier

Sun 7/278:14 pmSAT - DEN

Nonstop2h 31mFrontier

Deal found 4/29

$138

Sat 5/319:54 amDEN - SAT

Nonstop2h 10mUnited Airlines

Wed 6/49:10 amSAT - DEN

Nonstop2h 17mUnited Airlines

Deal found 4/30

$197

Tue 6/38:50 pmDEN - SAT

Nonstop2h 15mSouthwest

Sat 6/77:20 pmSAT - DEN

1 stop4h 45mSouthwest

Deal found 4/29

$207

Tue 6/34:39 pmDEN - SAT

1 stop6h 42mDelta

Sat 6/77:45 amSAT - DEN

1 stop8h 00mDelta

Deal found 4/29

$217

Sat 5/244:43 pmCOS - SAT

1 stop4h 20mAmerican Airlines

Sun 5/256:00 amSAT - COS

1 stop4h 42mAmerican Airlines

Deal found 4/30

$225

Sat 5/243:43 pmCOS - SAT

2 stops6h 16mUnited Airlines

Tue 5/275:39 amSAT - COS

1 stop4h 12mUnited Airlines

Deal found 4/30

$241

Thu 5/226:33 pmDEN - SAT

1 stop4h 25mAmerican Airlines

Sun 5/255:00 amSAT - DEN

1 stop6h 03mAmerican Airlines

Deal found 4/29

$243

Fri 5/304:39 pmGJT - SAT

1 stop5h 23mAmerican Airlines

Fri 6/66:55 pmSAT - GJT

1 stop6h 20mAmerican Airlines

Deal found 4/30

$289

Thu 9/46:00 amCOS - SAT

2 stops7h 45mSouthwest

Thu 9/1110:15 amSAT - COS

1 stop6h 30mSouthwest

Deal found 4/30

$292

Thu 5/155:15 amDRO - SAT

1 stop6h 47mUnited Airlines

Sat 5/174:53 pmSAT - DRO

1 stop4h 44mUnited Airlines

Deal found 5/1

$298

Thu 5/151:40 pmGJT - SAT

1 stop6h 27mUnited Airlines

Mon 5/194:53 pmSAT - GJT

1 stop4h 38mUnited Airlines

Deal found 4/29

$309

Fri 6/278:15 amCOS - SAT

1 stop7h 58mDelta

Mon 7/76:03 pmSAT - COS

1 stop5h 10mDelta

Deal found 4/29

$321

Best flights from Colorado to San Antonio
Discover carefully curated flight deals from Colorado to San Antonio that have cost, travel time, and layovers in mind to ensure you get the best travel experience. Data last updated May 1, 2025.

Thu 6/53:31 pmDEN - SAT

Nonstop2h 19mFrontier

Thu 6/128:12 pmSAT - DEN

Nonstop2h 33mFrontier

Deal found 4/29

$138

Sat 5/319:54 amDEN - SAT

Nonstop2h 10mUnited Airlines

Wed 6/49:10 amSAT - DEN

Nonstop2h 17mUnited Airlines

Deal found 4/30

$197

Sat 5/244:43 pmCOS - SAT

1 stop4h 20mAmerican Airlines

Sun 5/256:00 amSAT - COS

1 stop4h 42mAmerican Airlines

Deal found 4/30

$225

Sat 5/316:10 amDEN - SAT

1 stop4h 35mSouthwest

Wed 6/48:30 amSAT - DEN

Nonstop2h 15mSouthwest

Deal found 4/30

$227

Sat 5/314:06 pmDEN - SAT

1 stop6h 01mDelta

Sun 6/17:45 amSAT - DEN

1 stop5h 19mDelta

Deal found 4/29

$237

Fri 5/306:21 pmDEN - SAT

3 stops33h 43mMultiple Airlines

Sun 6/16:45 pmSAT - DEN

1 stop23h 42mMultiple Airlines

Deal found 4/30

$334

Tue 6/1011:40 amDEN - SAT

2 stops16h 30mAlaska Airlines

Fri 6/137:37 pmSAT - DEN

1 stop29h 22mAlaska Airlines

Deal found 4/30

$478

Sat 5/243:43 pmCOS - SAT

2 stops6h 16mUnited Airlines

Tue 5/275:39 amSAT - COS

1 stop4h 12mUnited Airlines

Deal found 4/30

$241

Fri 5/304:39 pmGJT - SAT

1 stop5h 23mAmerican Airlines

Fri 6/66:55 pmSAT - GJT

1 stop6h 20mAmerican Airlines

Deal found 4/30

$289

Thu 9/46:00 amCOS - SAT

2 stops7h 45mSouthwest

Thu 9/1110:15 amSAT - COS

1 stop6h 30mSouthwest

Deal found 4/30

$292

Fri 6/278:15 amCOS - SAT

1 stop7h 58mDelta

Mon 7/76:03 pmSAT - COS

1 stop5h 10mDelta

Deal found 4/29

$321

Thu 5/155:15 amDRO - SAT

1 stop6h 47mUnited Airlines

Sat 5/174:53 pmSAT - DRO

1 stop4h 44mUnited Airlines

Deal found 5/1

$298

Last-minute flights from Colorado to San Antonio
Discover last-minute flight deals from Colorado to San Antonio. Data last updated May 1, 2025 and is based on user searches.

Tue 5/65:15 pmCOS - SAT

1 stop4h 10mSouthwest

Thu 5/812:15 pmSAT - COS

1 stop3h 55mSouthwest

Deal found 4/30

$446

Tue 5/62:39 pmDEN - SAT

1 stop8h 20mAlaska Airlines

Tue 5/136:35 amSAT - DEN

2 stops15h 40mAlaska Airlines

Deal found 4/28

$758

Fri 5/912:59 amDEN - SAT

1 stop7h 38mDelta

Tue 5/135:20 amSAT - DEN

1 stop8h 22mDelta

Deal found 4/28

$327

Fri 5/93:40 pmCOS - SAT

1 stop4h 27mUnited Airlines

Tue 5/135:30 amSAT - COS

1 stop6h 19mUnited Airlines

Deal found 4/30

$351

Fri 5/96:35 amDEN - SAT

1 stop5h 30mSouthwest

Mon 5/1212:15 pmSAT - DEN

2 stops5h 20mSouthwest

Deal found 4/30

$478

Fri 5/96:30 pmDEN - SAT

3 stops33h 34mMultiple Airlines

Mon 5/126:45 amSAT - DEN

2 stops29h 45mMultiple Airlines

Deal found 4/30

$546

Sat 5/1012:30 amDEN - SAT

1 stop8h 22mFrontier

Thu 5/156:25 pmSAT - DEN

Nonstop2h 27mFrontier

Deal found 4/29

$175

Sat 5/108:23 pmDEN - SAT

Nonstop2h 23mUnited Airlines

Tue 5/135:30 amSAT - DEN

Nonstop2h 34mUnited Airlines

Deal found 4/28

$389

Sat 5/106:00 amCOS - SAT

1 stop8h 47mDelta

Mon 5/121:30 pmSAT - COS

1 stop8h 30mDelta

Deal found 4/30

$405

Thu 5/155:15 amDRO - SAT

1 stop6h 47mUnited Airlines

Sat 5/174:53 pmSAT - DRO

1 stop4h 44mUnited Airlines

Deal found 5/1

$298

Thu 5/151:40 pmGJT - SAT

1 stop6h 27mUnited Airlines

Mon 5/194:53 pmSAT - GJT

1 stop4h 38mUnited Airlines

Deal found 4/29

$309

Mon 5/196:31 pmDEN - SAT

2 stops27h 20mMultiple Airlines

Fri 5/3010:01 amSAT - DEN

2 stops32h 25mMultiple Airlines

Deal found 4/29

$377

One-way flights from Colorado to San Antonio
Search for one-way flight options from Colorado to San Antonio. Find affordable one-way fares based on user searches. Data last updated May 1, 2025.

Sat 5/313:35 pmDEN - SAT

Nonstop2h 16mFrontier

Deal found 4/30

$67

Wed 7/307:45 amDEN - SAT

Nonstop2h 05mSouthwest

Deal found 4/30

$99

Fri 7/49:40 amDEN - SAT

Nonstop2h 07mUnited Airlines

Deal found 4/30

$108

Sat 5/312:35 pmDEN - SAT

1 stop7h 32mDelta

Deal found 4/30

$109

Tue 7/12:28 pmCOS - SAT

1 stop8h 49mDelta

Deal found 4/29

$113

Fri 5/304:43 pmCOS - SAT

1 stop6h 15mAmerican Airlines

Deal found 4/29

$144

Tue 7/112:55 pmCOS - SAT

2 stops9h 04mUnited Airlines

Deal found 4/29

$153

Mon 6/26:21 pmDEN - SAT

2 stops27h 30mMultiple Airlines

Deal found 4/30

$163

Mon 6/305:55 amCOS - SAT

2 stops6h 25mSouthwest

Deal found 4/29

$199

Sat 5/3111:40 amDEN - SAT

2 stops16h 30mAlaska Airlines

Deal found 4/30

$222

Thu 7/35:30 pmDEN - SAT

2 stops14h 42mAmerican Airlines

Deal found 4/29

$278

Cheapflights Fare Finder

Use the filters below to find and compare flights from Colorado to San Antonio that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

DenverSan Antonio

DEN - SAT

DENSAT

Denver Intl

Thu 7/24

3:55 pm-7:13 pm

Nonstop2h 18m

San Antonio

Sun 7/27

8:14 pm-9:45 pm

Nonstop2h 31m

$138

DenverSan Antonio

DEN - SAT

DENSAT

Denver Intl

Sat 5/31

9:54 am-1:04 pm

Nonstop2h 10m

San Antonio

Wed 6/4

9:10 am-10:27 am

Nonstop2h 17m

$197

DenverSan Antonio

DEN - SAT

DENSAT

Denver Intl

Tue 6/3

8:50 pm-12:05 am

Nonstop2h 15m

San Antonio

Sat 6/7

7:20 pm-11:05 pm

1 stop4h 45m

$207

DenverSan Antonio

DEN - SAT

DENSAT

Denver Intl

Tue 6/3

4:39 pm-12:21 am

1 stop6h 42m

San Antonio

Sat 6/7

7:45 am-2:45 pm

1 stop8h 00m

$217

Colorado SpringsSan Antonio

COS - SAT

COSSAT

Colorado Springs

Sat 5/24

4:43 pm-10:03 pm

1 stop4h 20m

San Antonio

Sun 5/25

6:00 am-9:42 am

1 stop4h 42m

$225

Colorado SpringsSan Antonio

COS - SAT

COSSAT

Colorado Springs

Sat 5/24

3:43 pm-10:59 pm

2 stops6h 16m

San Antonio

Tue 5/27

5:39 am-8:51 am

1 stop4h 12m

$241

DenverSan Antonio

DEN - SAT

DENSAT

Denver Intl

Thu 5/22

6:33 pm-11:58 pm

1 stop4h 25m

San Antonio

Sun 5/25

5:00 am-10:03 am

1 stop6h 03m

$243

Grand JunctionSan Antonio

GJT - SAT

GJTSAT

Grand Junction Regnl

Fri 5/30

4:39 pm-11:02 pm

1 stop5h 23m

San Antonio

Fri 6/6

6:55 pm-12:15 am

1 stop6h 20m

$289

Colorado SpringsSan Antonio

COS - SAT

COSSAT

Colorado Springs

Thu 9/4

6:00 am-2:45 pm

2 stops7h 45m

San Antonio

Thu 9/11

10:15 am-3:45 pm

1 stop6h 30m

$292

DurangoSan Antonio

DRO - SAT

DROSAT

Durango La Plata County

Thu 5/15

5:15 am-1:02 pm

1 stop6h 47m

San Antonio

Sat 5/17

4:53 pm-8:37 pm

1 stop4h 44m

$298

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 24 results

Best time to book a flight from Colorado to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Colorado 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 Colorado to San Antonio

What is the cheapest month to book a flight from Colorado to San Antonio?

Currently, August is the cheapest month in which you can book a flight from Colorado to San Antonio (average of $295). Flying from Colorado to San Antonio in March is currently the most expensive (average of $376). 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 CO to SAT?

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

Rainfall in San Antonio by month

In terms of precipitation, rainfall in San Antonio ranges from 1.6 - 3.7 inches per month. May is typically the wettest month, when rainfall can reach 3.7 in. December is typically the driest time to visit San Antonio when rainfall is around 1.6 in.

Temperature in San Antonio by month

If weather is an important factor for your trip to San Antonio, 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 84.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 51.8 F).

Reviews of airlines servicing San Antonio

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Colorado to San Antonio to help guide your decision. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Alaska Airlines

8.0

Very good

9,968 reviews

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Southwest

8.0

Very good

4,294 reviews

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Delta

8.0

Very good

7,934 reviews

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

United Airlines

7.4

Good

8,696 reviews

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

American Airlines

7.2

Good

10,000 reviews

Alaska Airlines

8.0

Very good

9,968 reviews

Reviews

1 / 20

10.0

Excellent

James,Apr 2025

LAX - SFO

Good flight except the uncontrollable cold air from the ceiling.

Related info for your journey

What airport do you fly into for flights to San Antonio from Colorado?
Located just 7.6 mi from the city center, San Antonio (SAT) is the airport most travelers will use when flying to San Antonio from Colorado.
How popular is this Colorado to San Antonio flight route?
This flight path from Colorado to San Antonio was viewed by 21 users in the past month. Keep an eye out for changes in search interest prior to high and low season.
What are the cheapest airlines to fly from Colorado to San Antonio one-way?
For one-way options, check prices for Frontier. According to our data, you can fly for as low as $67. Users have also found prices from $99 and $108 on Southwest and United Airlines, respectively.
What are the most popular routes from Colorado to San Antonio?
When deciding which route to take from Colorado to San Antonio consider Denver Intl - San Antonio, Colorado Springs - San Antonio or Grand Junction Regnl - San Antonio as they are the most popular.
What are the most reliable airlines from Colorado to San Antonio?
Consider United Airlines (85%), Air Canada (83%) or Southwest (82%) when booking your flight. These represent the most reliable airlines when flying from Colorado to San Antonio.
What are the cheapest flights from Colorado to San Antonio?
On average you can expect to pay $183 for a flight from Colorado to San Antonio. The cheapest flight overall is $78 while the most popular route, (Denver Intl - San Antonio) is currently priced at $175.
Can I find deals for flights from Colorado to San Antonio that include hotel bookings?
Yes. In addition to deals on Colorado to San Antonio flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Colorado to San Antonio?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to San Antonio.
Can I find deals for business class flights from Colorado to San Antonio?
Yes. Cheapflights offers flight deals from Colorado to San Antonio 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 Colorado to San Antonio?
Currently, August is the cheapest month in which you can book a flight from Colorado to San Antonio (average of $295). Flying from Colorado to San Antonio in March is currently the most expensive (average of $376). 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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Top 4 airlines flying from Colorado to San Antonio

Airline	Cheapest	Average	Flexibility	On-time
Frontier	Cheapest$46	Average$148	FlexibilityNo cancel fee	On-time62%
United Airlines	Cheapest$143	Average$439	FlexibilityNo cancel fee	On-time69%
American Airlines	Cheapest$158	Average$400	FlexibilityNo cancel fee	On-time71%
Southwest	Cheapest$207	Average$342	FlexibilityNo cancel fee	On-time63%

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$67+ Cheap flights from Colorado to San Antonio (SAT)

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 5/31. Fares are subject to change and may not be available on all flights or dates of travel.

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Cheap flight deals from Colorado to San Antonio

Keep the following information in mind while searching for Colorado to San Antonio flight deals. Data was last updated May 1, 2025.

Most accurate provider

Most trusted provider

Round-trip from

One-way from

Popular in

Cheapest in

Average price

Good round-trip deal

Good one-way deal

Find flight deals from Colorado to San Antonio

Cheapest flights from Colorado to San AntonioExplore the most affordable flight options available from Colorado to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Explore the most affordable flight options available from Colorado to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.

Cheapflights Fare Finder

Use the filters below to find and compare flights from Colorado to San Antonio that are best for you.

Best time to book a flight from Colorado to San Antonio

Have a flexible travel schedule? Discover the best time to fly to San Antonio from Colorado with our price prediction graph.

Cheapflights Insights

Everything you need to know about your flight from Colorado to San Antonio

What is the cheapest month to book a flight from Colorado to San Antonio?

What is the cheapest time of day to fly from CO to SAT?

Find hourly flight availability from Colorado to San Antonio. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated May 1, 2025.

Rainfall in San Antonio by month

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

Temperature in San Antonio by month

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

Reviews of airlines servicing San Antonio

Peruse reviews from past customers who have flown with Alaska Airlines, Southwest and Delta from Colorado to San Antonio to help guide your decision. 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 Colorado to San Antonio. 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 San Antonio from Colorado?

How popular is this Colorado to San Antonio flight route?

What are the cheapest airlines to fly from Colorado to San Antonio one-way?

What are the most popular routes from Colorado to San Antonio?

What are the most reliable airlines from Colorado to San Antonio?

What are the cheapest flights from Colorado to San Antonio?

Can I find deals for flights from Colorado to San Antonio that include hotel bookings?

How can I find direct flights from Colorado to San Antonio?

Can I find deals for business class flights from Colorado to San Antonio?

What is the cheapest month to book a flight from Colorado to San Antonio?

Traveling to a place near Colorado?

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Alternative routes for Colorado to San Antonio

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Top 4 airlines flying from Colorado to San Antonio

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Cheapest flights from Colorado to San Antonio
Explore the most affordable flight options available from Colorado to San Antonio. Find the lowest fares from popular airlines and budget airlines, with prices last updated on May 1, 2025.