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

Delta, Lufthansa and Turkish Airlines are the most popular airlines when flying from Colorado to Zagreb.

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

Users have found that booking a flight from Colorado to Zagreb at least 48 days early can save you up to 84% on average compared to booking a flight this week. If booking 48 days before your flight isn’t an option for you, users have found flights from Colorado to Zagreb for as little as $753 when booking for a departure date within the next two weeks. You can also check prices now. Some users have found airline tickets as low as $2,888 for flights departing within the next 3 days.

What is the cheapest month to fly from Colorado to Zagreb?

The best pricing can be found in the month of March. Prices to Zagreb from Colorado average $898. You can even find prices in March for less than $898, as users have found deals to Zagreb from as low as $534. The month of June appears to be one of the more expensive times to travel to Zagreb from Colorado. Flying in the targeted month can save you up to 47%.

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

Zagreb Franjo Tuđman (ZAG) is the airport you will fly into if you book a flight from Colorado to Zagreb. It is only a 6.7 mi journey from Franjo Tuđman (ZAG) to Zagreb’s city center.

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

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

How can I find direct flights from Colorado to Zagreb?

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

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

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

$655+ Flights from Colorado to Zagreb - Compare & Save Big

Home Search by date Vacation packages Hotels Flight deals Car rental Travel tips & news

Find cheap flights from Colorado to Zagreb with Cheapflights

1. Tell us where you want to go

Enter your travel information like dates, passengers, trip type (one-way or round trip), and preferred cabin class then click “Find deals”

2. Select your favorite providers

We find the providers serving your travel needs. Choose up to four travel providers to compare side-by-side for flights, hotels, or car rentals.

3. Compare prices and book

Review each provider’s pricing and select the best option for you! Book through your favorite provider’s website for a seamless experience.

Cheap flight deals from Colorado to Zagreb

Most accurate provider	AranGrant 3 stars
Most trusted provider	AranGrant 3 stars
Round-trip from	$878 (Lufthansa)
Popular in	June
Cheapest in	March
Average price	$1,096

Provider with most accurate pricing for Denver Intl-Zagreb Franjo Tuđman flight deals.

Search Deals

Provider most trusted by Cheapflights users for Denver Intl-Zagreb Franjo Tuđman flights.

Search Deals

From Colorado to Zagreb Franjo Tuđman

Search Deals

Highest demand for flights based on searches. 24% potential increase in price ($293 potential increase over avg. RT price).

Search Deals

Cheapest flight prices on average. 4% potential price decrease ($39 potential savings vs. average RT price).

Search Deals

Average for round-trip flights in May 2025

Search Deals

Find flight deals from Colorado to Zagreb

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

Tue 8/194:15 pmDEN - ZAG

1 stop12h 20mMultiple Airlines

Tue 8/262:55 pmZAG - DEN

2 stops27h 26mMultiple Airlines

Deal found 4/30

$655

Tue 9/167:50 pmDEN - ZAG

1 stop15h 35mTurkish Airlines

Thu 10/29:35 amZAG - DEN

1 stop16h 20mTurkish Airlines

Deal found 4/30

$659

Mon 11/175:45 pmDEN - ZAG

1 stop20h 30mUnited Airlines

Tue 12/22:35 pmZAG - DEN

2 stops27h 53mUnited Airlines

Deal found 4/30

$665

Mon 11/174:25 pmDEN - ZAG

1 stop15h 30mLufthansa

Wed 11/266:15 amZAG - DEN

1 stop17h 40mLufthansa

Deal found 4/30

$668

Mon 11/175:40 pmDEN - ZAG

2 stops36h 10mAir Canada

Fri 11/286:15 amZAG - DEN

2 stops36h 13mAir Canada

Deal found 4/30

$671

Sat 11/1511:59 pmDEN - ZAG

2 stops30h 36mDelta

Tue 12/23:05 pmZAG - DEN

2 stops34h 24mDelta

Deal found 4/30

$684

Tue 9/211:30 amDEN - ZAG

2 stops16h 35mBritish Airways

Tue 9/168:10 pmZAG - DEN

1 stop28h 15mBritish Airways

Deal found 4/30

$702

Thu 5/292:35 pmCOS - ZAG

2 stops14h 00mLufthansa

Mon 6/93:00 pmZAG - COS

2 stops34h 52mLufthansa

Deal found 4/30

$1,085

Sun 11/165:35 pmDEN - ZAG

2 stops19h 25mSWISS

Sun 11/305:55 pmZAG - DEN

2 stops52h 35mSWISS

Deal found 4/30

$1,110

Thu 5/292:35 pmDEN - ZAG

2 stops15h 55mAir France

Mon 6/912:55 pmZAG - DEN

2 stops18h 03mAir France

Deal found 4/30

$1,129

Tue 8/1912:20 pmDEN - ZAG

3 stops24h 10mITA Airways

Tue 8/262:45 pmZAG - DEN

3 stops35h 53mITA Airways

Deal found 4/30

$1,190

Sat 6/146:00 amCOS - ZAG

3 stops30h 20mMultiple Airlines

Sat 6/213:15 pmZAG - COS

3 stops34h 37mMultiple Airlines

Deal found 4/30

$1,953

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

Mon 7/214:15 pmDEN - ZAG

1 stop12h 20mLufthansa

Mon 7/286:05 amZAG - DEN

1 stop15h 40mLufthansa

Deal found 4/30

$878

Mon 7/217:50 pmDEN - ZAG

1 stop33h 00mTurkish Airlines

Mon 7/281:45 pmZAG - DEN

1 stop36h 10mTurkish Airlines

Deal found 4/30

$893

Sun 7/275:59 pmDEN - ZAG

1 stop21h 36mUnited Airlines

Wed 8/66:15 amZAG - DEN

2 stops36h 05mUnited Airlines

Deal found 4/30

$915

Mon 7/216:35 pmDEN - ZAG

1 stop16h 50mBritish Airways

Mon 7/282:40 pmZAG - DEN

2 stops37h 25mBritish Airways

Deal found 4/30

$933

Sun 7/276:23 pmDEN - ZAG

2 stops20h 22mDelta

Fri 8/86:00 amZAG - DEN

2 stops21h 05mDelta

Deal found 4/30

$954

Fri 7/44:15 pmDEN - ZAG

1 stop21h 05mMultiple Airlines

Tue 8/52:55 pmZAG - DEN

2 stops27h 26mMultiple Airlines

Deal found 4/30

$1,069

Thu 5/292:35 pmDEN - ZAG

2 stops15h 55mAir France

Mon 6/912:55 pmZAG - DEN

2 stops18h 03mAir France

Deal found 4/30

$1,129

Mon 5/1211:25 amDEN - ZAG

2 stops17h 10mAir Canada

Mon 5/266:05 amZAG - DEN

2 stops18h 33mAir Canada

Deal found 4/30

$1,376

Mon 5/127:06 amDEN - ZAG

3 stops29h 24mITA Airways

Mon 5/262:45 pmZAG - DEN

3 stops37h 54mITA Airways

Deal found 4/30

$1,567

Thu 5/292:35 pmCOS - ZAG

2 stops14h 00mLufthansa

Mon 6/93:00 pmZAG - COS

2 stops34h 52mLufthansa

Deal found 4/30

$1,085

Sat 6/146:00 amCOS - ZAG

3 stops30h 20mMultiple Airlines

Sat 6/213:15 pmZAG - COS

3 stops34h 37mMultiple Airlines

Deal found 4/30

$1,953

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

Mon 5/56:00 amDEN - ZAG

2 stops29h 25mTurkish Airlines

Mon 5/191:45 pmZAG - DEN

1 stop36h 10mTurkish Airlines

Deal found 4/30

$1,199

Mon 5/54:15 pmDEN - ZAG

1 stop12h 20mLufthansa

Mon 5/191:20 pmZAG - DEN

1 stop32h 25mLufthansa

Deal found 4/30

$1,381

Mon 5/511:25 amDEN - ZAG

2 stops15h 15mMultiple Airlines

Mon 5/193:00 pmZAG - DEN

2 stops33h 30mMultiple Airlines

Deal found 4/30

$1,435

Mon 5/512:01 pmDEN - ZAG

3 stops24h 29mITA Airways

Mon 5/192:45 pmZAG - DEN

3 stops37h 54mITA Airways

Deal found 4/30

$2,105

Mon 5/1211:25 amDEN - ZAG

2 stops17h 10mAir Canada

Mon 5/266:05 amZAG - DEN

2 stops18h 33mAir Canada

Deal found 4/30

$1,376

Mon 5/127:06 amDEN - ZAG

3 stops29h 24mITA Airways

Mon 5/262:45 pmZAG - DEN

3 stops37h 54mITA Airways

Deal found 4/30

$1,567

Wed 5/284:15 pmDEN - ZAG

1 stop21h 05mLufthansa

Wed 6/116:05 amZAG - DEN

1 stop15h 40mLufthansa

Deal found 4/30

$981

Thu 5/297:45 amDEN - ZAG

2 stops18h 55mMultiple Airlines

Mon 6/91:20 pmZAG - DEN

1 stop32h 25mMultiple Airlines

Deal found 4/30

$1,078

Thu 5/292:35 pmCOS - ZAG

2 stops14h 00mLufthansa

Mon 6/93:00 pmZAG - COS

2 stops34h 52mLufthansa

Deal found 4/30

$1,085

Thu 5/292:35 pmDEN - ZAG

2 stops15h 55mAir France

Mon 6/912:55 pmZAG - DEN

2 stops18h 03mAir France

Deal found 4/30

$1,129

Thu 5/296:00 amCOS - ZAG

2 stops22h 45mMultiple Airlines

Mon 6/92:40 pmZAG - COS

3 stops28h 51mMultiple Airlines

Deal found 4/30

$2,606

Cheapflights Fare Finder

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

Fly from

Fly to

Route

Depart

Return

Price

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Mon 7/21

4:15 pm-12:35 pm

1 stop12h 20m

Zagreb Franjo Tuđman

Mon 7/28

6:05 am-1:45 pm

1 stop15h 40m

$878

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Mon 7/21

7:50 pm-12:50 pm

1 stop33h 00m

Zagreb Franjo Tuđman

Mon 7/28

1:45 pm-5:55 pm

1 stop36h 10m

$893

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Sun 7/27

5:59 pm-11:35 pm

1 stop21h 36m

Zagreb Franjo Tuđman

Wed 8/6

6:15 am-10:20 am

2 stops36h 05m

$915

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Mon 7/21

6:35 pm-7:25 pm

1 stop16h 50m

Zagreb Franjo Tuđman

Mon 7/28

2:40 pm-8:05 pm

2 stops37h 25m

$933

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Sun 7/27

6:23 pm-10:45 pm

2 stops20h 22m

Zagreb Franjo Tuđman

Fri 8/8

6:00 am-7:05 pm

2 stops21h 05m

$954

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Fri 7/4

4:15 pm-9:20 pm

1 stop21h 05m

Zagreb Franjo Tuđman

Tue 8/5

2:55 pm-10:21 am

2 stops27h 26m

$1,069

Colorado SpringsZagreb

COS - ZAG

COSZAG

Colorado Springs

Thu 5/29

2:35 pm-12:35 pm

2 stops14h 00m

Zagreb Franjo Tuđman

Mon 6/9

3:00 pm-5:52 pm

2 stops34h 52m

$1,085

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Thu 5/29

2:35 pm-2:30 pm

2 stops15h 55m

Zagreb Franjo Tuđman

Mon 6/9

12:55 pm-10:58 pm

2 stops18h 03m

$1,129

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Mon 5/12

11:25 am-12:35 pm

2 stops17h 10m

Zagreb Franjo Tuđman

Mon 5/26

6:05 am-4:38 pm

2 stops18h 33m

$1,376

DenverZagreb

DEN - ZAG

DENZAG

Denver Intl

Mon 5/12

7:06 am-8:30 pm

3 stops29h 24m

Zagreb Franjo Tuđman

Mon 5/26

2:45 pm-8:39 pm

3 stops37h 54m

$1,567

Flights are sorted by cheapest round-trip flights first.

Deals found on 4/30

Showing 1-10 of 11 results

Best time to book a flight from Colorado to Zagreb

Have a flexible travel schedule? Discover the best time to fly to Zagreb 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 Zagreb

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

Currently, November is the cheapest month in which you can book a flight from Colorado to Zagreb (average of $641). Flying from Colorado to Zagreb in June is currently the most expensive (average of $1,296). 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 ZAG?

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

Rainfall in Zagreb by month

In terms of precipitation, rainfall in Zagreb ranges from 1.9 - 3.7 inches per month. June is typically the wettest month, when rainfall can reach 3.7 in. February is typically the driest time to visit Zagreb when rainfall is around 1.9 in.

Temperature in Zagreb by month

If weather is an important factor for your trip to Zagreb, 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 69.8 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 32.0 F).

Reviews of airlines servicing Zagreb

Get a feel of what it's like to fly with Delta, Air France and United Airlines from Colorado to Zagreb by reading reviews from past customers. You can also see how each airline compares in terms of entertainment options, comfort, food, crew/service, and boarding process.

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Delta

8.0

Very good

7,934 reviews

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air France

7.4

Good

1,446 reviews

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

United Airlines

7.4

Good

8,696 reviews

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Turkish Airlines

7.3

Good

3,790 reviews

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Air Canada

7.0

Good

9,252 reviews

Delta

8.0

Very good

7,934 reviews

Reviews

1 / 20

10.0

Excellent

Aaron,Oct 2024

LAX - LHR

This was a flight operated by Virgin Atlantic in their Upper Class cabin. Overall, an outstanding experience.

Related info for your journey

What airport do you fly into for flights to Zagreb from Colorado?
Zagreb Franjo Tuđman (ZAG) is the airport you will fly into if you book a flight from Colorado to Zagreb. It is only a 6.7 mi journey from Franjo Tuđman (ZAG) to Zagreb’s city center.
Can I find deals for flights from Colorado to Zagreb that include hotel bookings?
Yes. In addition to deals on Colorado to Zagreb flights, Cheapflights offers vacation packages that include both flights and hotel.
How can I find direct flights from Colorado to Zagreb?
After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Colorado to Zagreb.
Can I find deals for business class flights from Colorado to Zagreb?
Yes. Cheapflights offers flight deals from Colorado to Zagreb 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 Zagreb?
Currently, November is the cheapest month in which you can book a flight from Colorado to Zagreb (average of $641). Flying from Colorado to Zagreb in June is currently the most expensive (average of $1,296). 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

Velika Gorica

Browse thousands of different options on Cheapflights for your next trip

Alternative routes for Colorado to Zagreb

Newark to Dubrovnik flights

John F Kennedy Intl to Dubrovnik flights

John F Kennedy Intl to Split flights

Newark to Split flights

John F Kennedy Intl to Zagreb flights

O'Hare Intl to Dubrovnik flights

Newark to Zagreb flights

LaGuardia to Dubrovnik flights

LaGuardia to Split flights

O'Hare Intl to Zagreb flights

LaGuardia to Zagreb flights

Dulles Intl to Split flights

Boston to Dubrovnik flights

Dulles Intl to Dubrovnik flights

Boston to Split flights

Los Angeles to Zagreb flights

O'Hare Intl to Split flights

Los Angeles to Split flights

Reagan-National to Dubrovnik flights

Los Angeles to Dubrovnik flights

Baltimore to Dubrovnik flights

Baltimore to Split flights

San Francisco to Split flights

San Francisco to Dubrovnik flights

Reagan-National to Split flights

Boston to Zagreb flights

Seattle to Split flights

San Francisco to Zagreb flights

Seattle to Dubrovnik flights

Seattle to Zagreb flights

Midway to Zagreb flights

Atlanta to Zagreb flights

Dallas/Fort Worth to Dubrovnik flights

John F Kennedy Intl to Zadar flights

Dallas/Fort Worth to Zagreb flights

Detroit to Dubrovnik flights

Denver to Dubrovnik flights

Des Moines to Zagreb flights

Newark to Zadar flights

Dulles Intl to Zagreb flights

Denver to Split flights

Grand Rapids to Zagreb flights

San Diego to Dubrovnik flights

Ontario to Dubrovnik flights

Ontario to Zagreb flights

Detroit to Zagreb flights

Midway to Split flights

Minneapolis to Dubrovnik flights

Atlanta to Dubrovnik flights

Portland to Split flights

Other flights to Zagreb

Zagreb to Luqa flights

Zagreb to Sofia flights

Zagreb to Naples flights

Zagreb to Split flights

Zagreb to Dubrovnik flights

Zagreb to Luqa flights

Zagreb to Paphos flights

Zagreb to Dublin flights

Zagreb to Stuttgart flights

Zagreb to London Heathrow Airport flights

Zagreb to Copenhagen flights

Zagreb to Athens flights

Zagreb to Belgrade flights

Zagreb to Athens flights

Zagreb to Dublin flights

Zagreb to Málaga flights

Zagreb to Split flights

Zagreb to Stuttgart flights

Top 3 airlines flying from Colorado to Zagreb

Airline	Cheapest	Average	Flexibility	On-time
Turkish Airlines	Cheapest$554	Average$676	FlexibilityNo cancel fee	On-time77%
Delta	Cheapest$595	Average$1,272	FlexibilityNo cancel fee	On-timeN/A
Lufthansa	Cheapest$733	Average$1,137	FlexibilityNo cancel fee	On-time76%

100% Free

Cheapflights is completely free to use, so you can start saving the moment you arrive.

Book with Flexibility

Our users can plan ahead with confidence and find flights with no change fees

Travel Smart

Millions of people come to us for their flight needs every year. We help make travel planning easy by providing useful insights and data-driven graphs that can inform your decisions.

$655+ Cheap flights from Colorado to Zagreb (ZAG)

This is the cheapest round-trip flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 8/19. Fares are subject to change and may not be available on all flights or dates of travel.

Find cheap flights from Colorado to Zagreb with Cheapflights

1. Tell us where you want to go

2. Select your favorite providers

3. Compare prices and book

Cheap flight deals from Colorado to Zagreb

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

Most accurate provider

Most trusted provider

Round-trip from

Popular in

Cheapest in

Average price

Find flight deals from Colorado to Zagreb

Cheapest flights from Colorado to ZagrebExplore the most affordable flight options available from Colorado to Zagreb. 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 Zagreb. 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 Zagreb that are best for you.

Best time to book a flight from Colorado to Zagreb

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

Cheapflights Insights

Everything you need to know about your flight from Colorado to Zagreb

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

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

Find hourly flight availability from Colorado to Zagreb. 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 Zagreb by month

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

Temperature in Zagreb by month

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

Reviews of airlines servicing Zagreb

Get insights into the airlines that provide service to Zagreb. 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 Zagreb. Reviews last updated May 1, 2025.

Get a feel of what it's like to fly with Delta, Air France and United Airlines from Colorado to Zagreb by reading reviews from past customers. You can also see how each airline compares 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 Zagreb. 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 Zagreb from Colorado?

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

How can I find direct flights from Colorado to Zagreb?

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

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

Traveling to a place near Colorado?

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 Colorado to Zagreb

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

Top 3 airlines flying from Colorado to Zagreb

100% Free

Book with Flexibility

Travel Smart

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