Hello there. When you start to price around for travel insurance, it will scare tha pants off you!! I finished treatment last July and booked to go to my niece's villa in Portugal in August. The flights cost £300 return for me & my husband plus luggage - my insurance cost me £296 for 1 week!!. That was the cheapest cover I could find - I was quoted from £296 right up to £700 ! again that was for only 1 week - they wouldn't take me on for annual insurance.
However - I have since learned that you can get 'normal' priced insurance if you declare your illness but exclude it. That means they will cover you for everything a normal (no pre-existing condition) person is covered for. They take on board that you have had cancer (or other pre-existing medical conditions) and you can claim for all other illnesses, accidents, luggage etc etc but not anything that is directly related to your condition.
This year, I am able to get insurance, declaring my ''pre-existing medical condition'' through Barclays where I bank, for about £69 for an annual policy. I'm just about to go ahead & take on the policy as I am going away in May again to Portugal.
If I had known this was possible last year I would not have wasted £300 when in my case nothing was going to arise from my having had cancer. My surgery went well and I've more or less recovered physically - still some side effects, but (sorry if it's too much info) my bladder, bowels, kidneys etc are working well and I don't forsee a problem arising when I'm on holiday. I had no issues whatsoever when I was in Portugal only a month after my treatment.
I will look up the company I booked with last year if you want this info, just let me know.